ISOLATED VARIANT OF A PARENT ALPHA-AMYLASE

专利摘要:
isolated variant of a parent alpha-amylase, isolated polynucleotide, nucleic acid construct, expression vector, host cell, and, methods for producing and obtaining a variant of a parent alpha-amylase. parent alpha-amylase. the present invention also concerns polynucleotides encoding the variants; nucleic acid constructs, vectors and host cells comprising the polynucleotides; and methods for using the variants.
公开号:BR112013033782B1
申请号:R112013033782-6
申请日:2012-06-29
公开日:2021-06-15
发明作者:Svend Kaasgaard；Jens Oebro；Signe Eskildsen Larsen；Allan Svendsen；Annette Helle Johansen；Michael Skjoet；Carsten Andersen；Lars Beier；Esben Peter Friis；Miguel Duarte Guilherme Pereira Toscano；Mads Bjoernvad；Frank Winther Rasmussen；Liv Spaangner Christiansen
申请人:Novozymes A / S；
IPC主号:

专利说明:

Reference to a string listing
[0001] This application contains a Sequence Listing in computer readable form, which is incorporated herein by reference. BACKGROUND OF THE INVENTION Field of the Invention
[0002] The present invention relates to variants of an alpha-amylase, polynucleotides encoding the variants, methods of making the variants and methods of using the variants. Description of Related Art
[0003] Alpha-amylases (alpha-1,4-glucan-4-glucanohydrolases, EC 3.2.1.1) constitute a group of enzymes that catalyze the hydrolysis of starch and other linear 1,4-glucosidic-, oligo- and polysaccharides and branched.
[0004] There is a long history of industrial use of alpha-amylases in various applications known as detergent, baking, brewing, liquefaction and starch saccharification, for example in the preparation of high fructose syrups or as part of the production of starch ethanol. These and other applications of alpha-amylases are known and use microorganism-derived alpha-amylases, in particular bacterial alpha-amylases.
[0005] Among the first bacterial alpha-amylases to be used was an alpha-amylase from B.LICHENIFORMIS, also known as Termamyl, which has been extensively characterized and whose crystal structure has been determined for this enzyme. Alkaline amylases, such as AA560, form a particular group of alpha-amylases that have been used in detergents. Many of these bacterial amylases have been modified to improve their functionality in a particular application.
[0006] Methods of increasing the thermostability of alpha-amylases have been well studied. Suzuki et al. (1989) discloses chimeric alpha-amylases, in which specified regions of a B. amyloliquefaciens alpha-amylase have been replaced by corresponding regions of a B. licheniformis alpha-amylase. The chimeric alpha-amylases were constructed with the purpose of identifying regions responsible for thermostability. Such regions were found to include amino acid residues 177-186 and amino acid residues 255-270 of the alpha-amylase B. amyloliquefaciens. Igarashi et al. 1998 shows that the thermostability of AmyS-type amylases can be increased by eliminating two amino acid residues, R179-G180, (AmyS numbering) from one cycle (F 178 to A184). However, Shiau et al. (2003) shows that an AmyS enzyme with elimination in the same cycle has a lower specific activity for the hydrolysis of corn starch at high temperature than the parent enzyme, negating one of the main advantages of AmyS amylases.
[0007] For environmental reasons, it has been increasingly important to lower the temperature in laundry, dishwashing and/or cleaning processes. However, most enzymes including amylases have an optimum temperature which is above the temperature normally used in low temperature washing. Alpha-amylase is a key enzyme for use in detergent compositions and its use has become increasingly important for removing starch stains during laundry or dishwashing. As such, it is important to find alpha-amylase variants, which retain their washing performance, stain removal effect and/or activity when the temperature is reduced. However, despite the efficiency of current detergent enzyme compositions, there are many stains that are difficult to completely remove. These problems are compounded by the increased use of low wash temperatures (eg cold water) and shorter wash cycles. Thus, it is desirable to have amylolytic enzymes that can function at low temperature and at the same time preserve or enhance other desirable properties such as specific activity (amylolytic activity), stability and/or wash performance.
[0008] Thus, it is an object of the present invention to provide variants of alpha-amylases that could be used in laundry, dishwashing and/or low temperature cleaning processes, such as temperatures of 5-35°C. It is a further object of the present invention to provide alpha-amylase variants which have better low temperature washing performance compared to the parent alpha-amylase or compared to the alpha-amylase of any SEQ ID NO: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12. Invention Summary
[0009] The present invention relates to isolated variants of a parent alpha-amylase, comprising a change in two or more (several) positions corresponding to positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477 of the mature polypeptide of SEQ ID NO: 1, wherein each change is independently a substitution, deletion or insertion, and wherein the variant has at least 80%, but less than 100% sequence identity with the mature polypeptide of any of SEQ ID NOs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, and wherein the variant has alpha-amylase activity.
[00010] The present invention also concerns isolated polynucleotides encoding the variants; nucleic acid constructs, vectors and host cells comprising the polynucleotides; and methods for producing the variants.
[00011] The present invention also relates to methods for preparing such variants. DETAILED DESCRIPTION OF THE INVENTION
[00012] The present invention relates to isolated variants of a parent alpha-amylase, comprising a change in two or more (several) positions corresponding to positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477 of the mature polypeptide of SEQ ID NO: 1, wherein each change is independently a substitution, deletion or insertion, and wherein the variant has at least 80%, but less than 100% sequence identity with the mature polypeptide of any of SEQ ID NOs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, and wherein the variant has alpha-amylase activity. Definitions
[00013] Alpha-amylase activity: The term "alpha-amylase activity" means the activity of alpha-1,4-glucan-4-glucanohydrolases, EC 3.2.1.1, which constitute a group of enzymes that catalyze the hydrolysis of starch and other linear and branched 1,4-glucosidic-, oligo- and polysaccharides.
[00014] Variant: The term "variant" means a polypeptide with alpha-amylase activity comprising an alteration, that is, a substitution, insertion and/or deletion in one or more (several) positions. A substitution means a substitution of an amino acid occupying one position with a different amino acid; a deletion means the removal of an amino acid occupying a position; and an insertion means to add 1-3 amino acids adjacent to an amino acid occupying a position.
[00015] Mutant: The term "mutant" means a polynucleotide encoding a variant.
[00016] Wild-type enzyme: The term "wild-type" alpha-amylase means an alpha-amylase expressed by a naturally occurring microorganism, such as a bacterial, yeast, or filamentous fungus found in nature.
[00017] Parent or parent alpha-amylase: The term "parent" or "parent alpha-amylase" means an alpha-amylase to which an alteration is made to produce the enzyme variants of the present invention. The parent can be a naturally occurring (wild-type) polypeptide or a variant thereof.
[00018] Isolated variant: The term “isolated variant” means a variant that is modified by the hand of man. In one aspect, the variant is at least 1% pure, for example, at least 5% pure, at least 10% pure, at least 20% pure, at least 40% pure, at least 60% pure, at least 80% pure pure and at least 90% pure, as determined by SDS-PAGE.
[00019] Substantially pure variant: The term "substantially pure variant" means a preparation containing at most 10%, at most 8%, at most 6%, at most 5%, at most 4%, at most 3%, in maximum 2%, maximum 1% and maximum 0.5% by weight of another polypeptide material with which it is natively or recombinantly associated. Preferably, the variant is at least 92% pure, for example at least 94% pure, at least 95% pure, at least 96% pure, at least 97% pure, at least 98% pure, at least 99% pure , at least 99.5% pure and 100% pure by weight of the total polypeptide material present in the preparation. The variants of the present invention are preferably in substantially pure form. This can be achieved, for example, by preparing the variant by well known recombinant methods or by classical purification methods.
[00020] Mature polypeptide: The term "mature polypeptide" means a polypeptide in its final form following translation and any post-translational modifications such as N-terminal processing, C-terminal truncation, glycosylation, phosphorylation, etc.
[00021] Mature polypeptide coding sequence: The term “mature polypeptide coding sequence” means a polynucleotide that encodes a mature polypeptide with alpha-amylase activity.
[00022] Sequence identity: The relationship between two amino acid sequences or between two nucleotide sequences is described by the parameter "sequence identity".
[00023] For the purposes of the present invention, the degree of sequence identity between two amino acid sequences is determined using the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, J. Mol. Biol. 48: 443-453) as implemented in Needle program from the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000, Trends Genet. 16: 276-277), preferably version 3.0.0 or higher. The optional parameters used are 10 open range penalty, 0.5 range extension penalty, and the EBLOSUM62 substitution matrix (EMBOSS version of BLOSUM62). The Needle tag “longest identity” result (obtained using the -nobrief option) is used as the percent identity and is calculated as follows:(Identical Residuals x 100)/(Alignment Length - Total Number of Gaps in Alignment )
[00024] For the purposes of the present invention, the degree of sequence identity between two deoxyribonucleotide sequences is determined using the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, supra) as implemented in the Needle program of the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000, supra), preferably version 3.0.0 or higher. The optional parameters used are open gap penalty of 10, gap extension penalty of 0.5, and the substitution matrix EDNAFULL (EMBOSS version of NCBI NUC4.4). The Needle tag “longest identity” result (obtained using the -nobrief option) is used as the percent identity and is calculated as follows:(Identical Deoxyribonucleotides x 100)/(Length of Alignment - Total Number of Gaps in Alignment )
[00025] Fragment: The term "fragment" means a polypeptide with one or more (several) amino acids deleted from the amino and/or carboxy terminus of a mature polypeptide; wherein the fragment has alpha-amylase activity.
[00026] Subsequence: The term "subsequence" means a polynucleotide with one or more (several) nucleotides deleted from the 5' end and/or 3' coding sequence of a mature polypeptide; wherein the subsequence encodes a fragment with alpha-amylase activity.
[00027] Allelic variant: The term "allelic variant" means one of two or more alternative forms of a gene occupying the same chromosomal location. Allelic variation occurs naturally through mutation and can result in polymorphism within populations. Genetic mutations can be silent (no change in the encoded polypeptide) or can encode polypeptides with altered amino acid sequences. An allelic variant of a polypeptide is a polypeptide encoded by an allelic variant of a gene.
[00028] Isolated polynucleotide: The term “isolated polynucleotide” means a polynucleotide that is modified by the hand of man. In one aspect, the isolated polynucleotide is at least 1% pure, for example, at least 5% pure, at least 10% pure, at least 20% pure, at least 40% pure, at least 60% pure, at least 80 % pure, at least 90% pure and at least 95% pure, as determined by agarose electrophoresis. Polynucleotides can be of genomic, cDNA, RNA, semi-synthetic or synthetic origin, or any combination thereof.
[00029] Substantially pure polynucleotide: The term "substantially pure polynucleotide" means a polynucleotide preparation free of other extraneous or unwanted polynucleotides and in a form suitable for use within genetically modified polypeptide production systems. Thus, a substantially pure polynucleotide contains at most 10%, at most 8%, at most 6%, at most 5%, at most 4%, at most 3%, at most 2%, at most 1% and at most 0 .5% by weight of another polynucleotide material with which it is natively or recombinantly associated. A substantially pure polynucleotide can, however, include 5' and 3' untranslated regions, such as promoters and terminators. It is preferred that the substantially pure polynucleotide is at least 90% pure, e.g. at least 92% pure, at least 94% pure, at least 95% pure, at least 96% pure, at least 97% pure, at least 98 % pure, at least 99% pure and at least 99.5% pure by weight. The polynucleotides of the present invention are preferably in substantially pure form.
[00030] Coding sequence: The term "coding sequence" means a polynucleotide, which directly specifies the amino acid sequence of its polypeptide product. The coding sequence boundaries are generally determined by an open reading frame that usually starts with the ATG start codon or alternative start codons like GTG and TTG and ends with an end codon like TAA, TAG and TGA. The coding sequence can be a DNA, cDNA, synthetic or recombinant polynucleotide.
[00031] cDNA: The term "cDNA" means a DNA molecule that can be prepared by reverse transcription of a spliced mature mRNA molecule obtained from a eukaryotic cell. The cDNA lacks intron sequences that may be present in the corresponding genomic DNA. The initial primary RNA transcript is an mRNA precursor that is processed through a series of steps, including processing, before appearing as spliced mature mRNA.
[00032] Nucleic Acid Construction The term "nucleic acid construct" means a nucleic acid molecule, either single-stranded or double-stranded, that is isolated from a naturally occurring gene or is modified to contain nucleic acid segments in a way that would not otherwise exist in otherwise in nature or that it is synthetic. The term nucleic acid construct is synonymous with the term "expression cassette" when the nucleic acid construct contains the control sequences necessary for expression of a coding sequence of the present invention.
[00033] Control sequences: The term "control sequences" means all the components necessary for the expression of a polynucleotide encoding a variant of the present invention. Each control sequence can be native or foreign to the polynucleotide encoding the variant or native or foreign to each other. Such control sequences include, but are not limited to, a leader, polyadenylation sequence, propeptide sequence, promoter, signal peptide sequence and transcription terminator. At a minimum, the control sequences include a promoter and transcriptional and translational stop signals. The control sequences can be provided with linkers for the purpose of introducing specific restriction sites facilitating the linkage of the control sequences to the coding region of the polynucleotide encoding a variant.
[00034] Operably linked: The term "operably linked" means a configuration in which a control sequence is placed in an appropriate position relative to the coding sequence of a polynucleotide such that the control sequence directs the expression of the coding sequence .
[00035] Expression: The term "expression" includes any step involved in producing the variant including, but not limited to, transcription, post-transcriptional modification, translation, post-translational modification, and secretion.
[00036] Expression vector: The term "expression vector" means a linear or circular DNA molecule which comprises a polynucleotide encoding a variant and which is operably linked to additional nucleotides which ensure its expression.
[00037] Host cell: The term "host cell" means any type of cell that is susceptible to transformation, transfection, transduction and the like with a nucleic acid construct or expression vector comprising a polynucleotide of the present invention. The term "host cell" encompasses any offspring of a parent cell that is not identical to the parent cell due to mutations that occur during replication.
[00038] Starch removal process: The term "starch removal process" refers to any type of process by which starch is removed (or converted) such as in washing processes where starch is removed from fabrics, by example, cleaning fabrics such as washing clothes. A starch removal process may also be hard surface cleaning such as dishwashing or may be general cleaning processes such as industrial or institutional cleaning. The term also encompasses other starch removal or starch conversion processes, ethanol production, starch liquefaction, textile desizing, paper and pulp production, brewing and detergents in general.
[00039] Improved property: The term "improved property" means a trait associated with a variant that is improved compared to the parent. Such improved properties include, but are not limited to, thermal activity, thermostability, pH activity, pH stability, substrate/cofactor specificity, improved surface properties, product specificity, increased stability or solubility in the presence of pretreated biomass, stability improved under storage conditions and chemical stability.
[00040] Washing performance: In the present context, the term "washing performance" is used as the ability of an enzyme to remove starch or starch-containing stains present on the object to be cleaned during, for example, laundry or laundry cleaning. hard surfaces such as dishwashing. Washing performance can be quantified by calculating the so-called intensity value (Int) defined in the AMSA description or in the beaker washing performance test in the Methods section below.
[00041] Improved wash performance: The term "improved wash performance" is defined herein as a variant enzyme exhibiting a change in the wash performance of an amylase variant relative to the wash performance of the parent amylase or relative to alpha-amylase with the identical amino acid sequence of said variant, but not having the deletion at one or more of the positions specified or relative to the activity of an alpha-amylase with the amino acid sequence shown in SEQ ID NO 4, for example by increased spotting. The term “washing performance” includes general cleaning, for example hard surface cleaning such as dishwashing, but also fabric washing performance such as laundry and also industrial and institutional cleaning.
[00042] Low temperature: "Low temperature" is a temperature of 5-35°C, preferably 5-30°C, more preferably 5-25°C, more preferably 5-20°C, most preferably 5-15° C, and in particular 510°C. In a preferred embodiment, "Low temperature" is a temperature of 10-35°C, preferably 10-30°C, more preferably 1025°C, more preferably 10-20°C, and in particular 10-15°C Ç. Variant Assignment Conventions
[00043] For the purposes of the present invention, the mature polypeptide disclosed in SEQ ID NO: 1 is used to determine the corresponding amino acid residue in another alpha-amylase. The amino acid sequence of another alpha-amylase is aligned with the mature polypeptide disclosed in SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6 and based on the alignment, the amino acid position number corresponding to any amino acid residue in the mature polypeptide disclosed in SEQ ID NO: 1 is determined using the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, J. Mol. Biol. 48 : 443-453) as implemented in the Needle program of the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000, Trends Genet. 16: 276-277), preferably version 3.0.0 or higher .
[00044] Identification of the corresponding amino acid residue in another alpha-amylase can be confirmed by an alignment of multiple polypeptide sequences using "ClustalW" (Larkin et al., 2007, Bioinformatics 23: 2947-2948).
[00045] When the other enzyme has diverged from the mature polypeptide of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, or SEQ ID NO: 6 in such a way to which traditional sequence-based comparison fails to detect their relationship (Lindahl and Elofsson, 2000, J. Mol. Biol. 295: 613-615), other peer-to-peer sequence comparison algorithms can be used. Greater sensitivity in sequence-based searching can be achieved using search programs that use probabilistic representations of polypeptide families (profiles) to search databases. For example, the PSI-BLAST program generates profiles through an iterative database search process and is capable of detecting remote counterparts (Atschul et al., 1997, Nucleic Acids Res. 25: 3389-3402). Even greater sensitivity can be achieved if the family or superfamily for the polypeptide has one or more representatives in the protein structure databases. Programs such as GenTHREADER (Jones, 1999, J. Mol. Biol. 287: 797-815; McGuffin and Jones, 2003, Bioinformatics 19: 874-881) use information from a variety of sources (PSI-BLAST, secondary structure prediction, profiles of structural alignments and solvation potentials) as input to a neural network that predicts structural unfolding for a query sequence. Similarly, the method of Gough et al., 2000, J. Mol. Biol. 313: 903-919, can be used to align a sequence of unknown structure with the superfamily models present in the SCOP database. These alignments can in turn be used to generate homology models for the polypeptides, and such models can be evaluated for accuracy using various tools developed for the purpose.
[00046] For proteins of known structure, there are several tools and resources to recover and generate structural alignments. For example, SCOP protein superfamilies have been structurally aligned and these alignments are accessible and downloadable. Two or more protein structures can be aligned using various algorithms such as distance alignment matrix (Holm and Sander, 1998, Proteins 33: 88-96) or combinatorial extension (Shindyalov and Bourne, 1998, Protein Engineering 11: 739-747 ).
[00047] In describing the alpha-amylase variants of the present invention, the nomenclature described below is adapted for ease of reference. The accepted single letter or three letter IUPAC amino acid abbreviation is used.
[00048] Substitutions. For an amino acid substitution, the following nomenclature is used: Original amino acid, position, substituted amino acid. Accordingly, the substitution of threonine for alanine at position 226 is designated as "Thr226Ala" or "T226A". Multiple mutations are separated by plus signs ("+"), for example, "Gly205Arg + Ser411Phe" or "G205R + S411F", representing substitutions at positions 205 and 411 of glycine (G) by arginine (R) and serine (S ) by phenylalanine (F), respectively.
[00049] Eliminations. For an amino acid deletion, the following nomenclature is used: Original amino acid, position*. Accordingly, the elimination of glycine at position 195 is designated as "Gly195*" or "G195*". Multiple deletions are separated by plus signs (“+”), for example, “Gly195* + Ser411*” or “G195* + S411*”.
[00050] Inserts. For an amino acid insertion, the following nomenclature is used: Original amino acid, position, original amino acid, inserted amino acid. Accordingly, the lysine insert at position 195 is designated as "Gly195GlyLys" or "G195GK". A multiple amino acid insertion is designated [original amino acid, position, original amino acid, inserted amino acid #1, inserted amino acid #2; etc.]. For example, the insertion of lysine and alanine after the glycine at position 195 is designated as "Gly195GlyLysAla" or "G195GKA".
[00051] In such cases, the inserted amino acid residue(s) are numbered by adding lowercase to the amino acid residue position number preceding the inserted amino acid residue(s). In the example above, the sequence would then be:

[00052] Multiple changes. Variants comprising multiple alterations are separated by plus signs ("+"), for example "Arg170Tyr+Gly195Glu" or "R170Y+G195E" representing a substitution of tyrosine and glutamic acid by arginine and glycine at positions 170 and 195, respectively.
[00053] Different substitutions. Where different substitutions can be introduced at one position, the different substitutions are separated by a comma, for example “Arg170Tyr,Glu” represents a substitution of arginine for tyrosine or glutamic acid at position 170. Thus, “Tyr167Gly,Ala + Arg170Gly,Ala ” designates the following variants:
[00054] “Tyr167Gly+Arg170Gly”, “Tyr167Gly+Arg170Ala”, “Tyr167Ala+Arg170Gly”, and “Tyr167Ala+Arg170Ala”. Parental alpha-amylases
[00055] The parent alpha-amylase may be a polypeptide with at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 1.
[00056] In one aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 1 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by less than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 1.
[00057] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 1. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 1.
[00058] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 1.
[00059] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO:2.
[00060] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 2 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 2.
[00061] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 2. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 2.
[00062] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO:2.
[00063] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO:3.
[00064] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 3 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 3.
[00065] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 3. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 3.
[00066] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 3.
[00067] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 4.
[00068] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 4 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 4.
[00069] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 4. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 4.
[00070] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 4.
[00071] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 5.
[00072] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 5 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 5.
[00073] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 5. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 5.
[00074] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 5.
[00075] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO:6.
[00076] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 6 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 6.
[00077] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 6. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 6.
[00078] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 6.
[00079] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 7.
[00080] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 7 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 7.
[00081] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 7. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 7.
[00082] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 7.
[00083] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 8.
[00084] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 8 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 8.
[00085] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 8. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 8.
[00086] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 8.
[00087] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 9.
[00088] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 9 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 9.
[00089] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 9. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 9.
[00090] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 9.
[00091] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 10.
[00092] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 10 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 10.
[00093] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 10. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 10.
[00094] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 10.
[00095] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 11.
[00096] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 11 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 11.
[00097] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 11. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 11.
[00098] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 11.
[00099] The parent alpha-amylase may also be a polypeptide having at least 80% sequence identity with the mature polypeptide of SEQ ID NO: 12.
[000100] In another aspect, the parent has a sequence identity with the mature polypeptide of SEQ ID NO: 12 of at least 80%, for example at least 85%, at least 87%, at least 90%, at least 95 %, at least 96%, at least 97%, at least 98%, at least 99%, or 100%, that have alpha-amylase activity. In one aspect, the parent amino acid sequence differs by no more than ten amino acids, for example, five amino acids, four amino acids, three amino acids, two amino acids, and one amino acid from the mature polypeptide of SEQ ID NO: 12.
[000101] The parent preferably comprises or consists of the amino acid sequence of SEQ ID NO: 12. In another aspect, the parent comprises or consists of the mature polypeptide of SEQ ID NO: 12.
[000102] In another embodiment, the parent is an allelic variant of the mature polypeptide of SEQ ID NO: 12.
[000103] The amino acid sequence of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, SEQ ID NO: 12 or a fragment thereof, can be used to design nucleic acid probes to identify and clone DNA encoding a parent of strains of different genera or species according to methods well known in the art. In particular, such probes can be used for hybridization with the genomic or cDNA of the genus or species of interest, following standard Southern transfer procedures, in order to identify and isolate the corresponding gene there. Such probes can be considerably shorter than the entire sequence, but must be at least 14, for example, at least 25, at least 35, or at least 70 nucleotides in length. Preferably, the nucleic acid probe is at least 100 nucleotides in length, for example at least 200 nucleotides, at least 300 nucleotides, at least 400 nucleotides, at least 500 nucleotides, at least 600 nucleotides, at least 700 nucleotides, at least 800 nucleotides or at least 900 nucleotides in length. DNA and RNA probes can be used. Probes are typically tagged to detect the corresponding gene (for example, with 32P, 3H, 35S, biotin, or avidin). Such probes are encompassed by the present invention.
[000104] A genomic DNA or cDNA library prepared from such organisms can be screened for DNA that hybridizes to the above-described probes and encodes a parent. Genomic or other DNA from such other organisms can be separated by agarose or polyacrylamide gel electrophoresis or other separation techniques. DNA from the libraries or the separated DNA can be transferred to and immobilized on nitrocellulose or other suitable carrier material, which is used in a Southern blot.
[000105] For purposes of the present invention, hybridization indicates that the polynucleotide hybridizes to a labeled nucleotide probe corresponding to a polynucleotide encoding SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, SEQ ID NO: 12 or a subsequence thereof , under low to very high stringency conditions. Molecules to which the probe hybridizes can be detected using, for example, X-ray film or any other means of detection known in the art.
[000106] In one aspect, the nucleic acid probe is a polynucleotide encoding the polypeptide of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, SEQ ID NO: 12 or a fragment thereof.
[000107] For long probes of at least 100 nucleotides in length, low to very high stringency conditions are defined as prehybridization and hybridization at 42°C in 5X SSPE, 0.3% SDS, 200 micrograms/ml of DNA from shredded and denatured salmon sperm and 25% formamide for low and very low stringencies, 35% formamide for medium and high-medium stringencies, or 50% formamide for high and very high stringencies, following standard Southern transfer procedures for 12 to 24 hours, so great. The carrier material is finally washed three times, each lasting 15 minutes using 2X SSC, 0.2% SDS at 45°C (very low stringency), 50°C (low stringency), 55°C (medium stringency ), 60°C (medium-high stringency), 65°C (high stringency), or 70°C (very high stringency).
[000108] For short probes that are between 15 nucleotides to about 70 nucleotides in length, the stringency conditions are defined as prehybridization and hybridization at about 5°C to 10°C below the calculated Tm using the calculation accordingly with Bolton and McCarthy (1962, Proc. Natl. Acad. Sci. USA 48: 1390) in 0.9 M NaCl, 0.09 M Tris-HCl pH 7.6, 6 mM EDTA, 0.5% NP-40 , 1X Denhardt's solution, 1 mM sodium pyrophosphate, 1 mM monobasic sodium phosphate, 0.1 mM ATP, and 0.2 mg yeast RNA per ml following standard Southern blotting procedures for 12 to 24 hours, so excellent. The carrier material is finally washed once in 6X SCC plus 0.1% SDS for 15 minutes and twice each for 15 minutes using 6X SSC between 5°C to 10°C below the calculated Tm.
[000109] The parent can be obtained from microorganisms of any genus. For purposes of the present invention, the term "obtained from" as used herein in connection with a particular source shall mean that the parent encoded by a polynucleotide is produced by the source or by a cell into which the source polynucleotide was inserted. In one aspect, the parent is secreted extracellularly.
[000110] The parent may be a bacterial alpha-amylase. For example, the parent can be a gram-positive bacterial polypeptide such as an alpha-amylase Bacillus, Clostridium, Enterococcus, Geobacillus, Lactobacillus, Lactococcus, Oceanobacillus, Staphylococcus, Streptococcus, or Streptomyces, or a gram-negative bacterial polypeptide such as an alpha Campylobacter amylase, E. coli, Flavobacterium, Fusobacterium, Helicobacter, Ilyobacter, Neisseria, Pseudomonas, Salmonella, or Ureaplasma.
[000111] In one aspect, the parent is an alpha-amylase Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillus brevis, Bacillus circulans, Bacillus clausii, Bacillus coagulans, Bacillus firmus, Bacillus lautus, Bacillus lentus, Bacillus licheniformis, Bacillus megaterium, Bacillus pumilus, Bacillus stearothermophilus, Bacillus subtilis, or Bacillus thuringiensis.
[000112] In another aspect, the parent is an alpha-amylase Streptococcus equisimilis, Streptococcus pyogenes, Streptococcus uberis, or Streptococcus equi subsp. Zooepidemicus.
[000113] In another aspect, the parent is an alpha-amylase Streptomyces achromogenes, Streptomyces avermitilis, Streptomyces coelicolor, Streptomyces griseus, or Streptomyces lividans.
[000114] The parent may be a fungal alpha-amylase. For example, the parent may be a yeast alpha-amylase such as Candida alpha-amylase, Kluyveromyces, Pichia, Saccharomyces, Schizosaccharomyces or Yarrowia. For example, the parent may be a filamentous fungal alpha-amylase such as Acremonium alpha-amylase, Agaricus, Alternaria, Aspergillus, Aureobasidium, Botryospaeria, Ceriporiopsis, Chaetomidium, Chrysosporium, Claviceps, Cochliobolus, Coprinastermia, Cryplococcus, Copto , Exidia, Filibasidium, Fusarium, Gibberella, Holomastigotoides, Humicola, Irpex, Lentinula, Leptospaeria, Magnaporthe, Melanocarpus, Meripilus, Mucor, Myceliophthora, Neocallimastix, Neurospora, Paecilomyces, Penicillium, Phanerophyllium, Phanerophyllium , Scytalidium, Talaromyces, Thermoascus, Thielavia, Tolypocladium, Trichoderma, Trichophaea, Verticillium, Volvariella or Xylaria.
[000115] In another aspect, the parent is an alpha-amylase Saccharomyces carlsbergensis, Saccharomyces cerevisiae, Saccharomyces diastaticus, Saccharomyces douglasii, Saccharomyces kluyveri, Saccharomyces norbensis or Saccharomyces oviformis.
[000116] In another aspect, the parent is an alpha-amylase Acremonium cellulolyticus, Aspergillus aculeatus, Aspergillus awamori, Aspergillus foetidus, Aspergillus fumigatus, Aspergillus japonicus, Aspergillus nidulans, Aspergillus niger, Aspergillus awamori, Aspergillus foetidus, Aspergillus fumigatus, Aspergillus japonicus, Aspergillus nidulans, Aspergillus niger, Aspergillus awamori, Chhoprysporium, Chhoprysporium Chrysosporium shitrium, Chrysosporium pannicola, Chrysosporium queenslandicum, Chrysosporium tropicum, Chrysosporium zonatum, Fusarium bactridioides, Fusarium cerealis, Fusarium crookwellense, Fusarium culmorum, Fusarium lusa Fusarium, Fusarium graminearum, Fusarium graminearum, Fusarium graminearum, Fusaporium reticulatum, Fusarium graminum , Fusarium sarcochroum, Fusarium sporotrichioides, Fusarium sulphureum, Fusarium torulosum, Fusarium trichothecioides, Fusarium venenatum, Humicola grisea, Humicola insolens, Humicola lanuginosa, Irpex lacteus, Mucor miespora Penetra, Myceliopht m, Penicillium purpurogenum, Phanerochaete chrysosporium, Thielavia achromatica, Thielavia albomyces, Thielavia albopilosa, Thielavia australeinsis, Thielavia fimeti, Thielavia microspora, Thielavia ovispora, Thielavia peruviana, Thielavia teruviana, Thielavia, Thylavia, Thylavia, Thielavia, Thylavia, Thielavia, Thylavia, Thylavia Trichodermalongibrachiatum, Trichoderma reesei or Trichoderma viride.
[000117] In another aspect, the parent is a Bacillus sp. alpha-amylase, for example the alpha-amylase of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, or SEQ ID NO: 6.
[000118] It will be understood that for the aforementioned species, the invention encompasses both perfect and imperfect states, and other taxonomic equivalents, for example anamorphs, regardless of the name of the species by which they are known. Technicians in the field will be able to recognize the identity of the appropriate equivalents.
[000119] Strains of these species are easily accessible to the public in various culture collections such as the American Type Culture Collection (ATCC), Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (DSM), Centraalbureau Voor Schimmelcultures (CBS) and the Agricultural Research Service Patent Culture Collection, Northern Regional Research Center (NRRL).
[000120] The parent can be identified and obtained from other sources including microorganisms isolated from nature (eg soil, compost, water, etc.) or DNA samples obtained directly from natural materials (eg soil, compost, water, etc.). ) using the above probes. Techniques for isolating microorganisms and DNA directly from habitats are well known in the art. The polynucleotide encoding a parent can then be derived by similarly screening a genomic or cDNA library from another microorganism or mixed DNA sample. Once a polynucleotide encoding a parent is detected with a probe, the polynucleotide can be isolated or cloned using techniques known to those skilled in the art (see, for example, Sambrook et al., 1989, supra).
[000121] The parent can be a hybrid polypeptide in which a portion of one polypeptide is fused at the N-terminus or C-terminus of a portion of another polypeptide.
[000122] The parent can also be a fused polypeptide or cleavable fusion polypeptide in which a polypeptide is fused at the N-terminus or C-terminus of another polypeptide. A fused polypeptide is produced by fusing a polynucleotide encoding one polypeptide to a polynucleotide encoding another polypeptide. Techniques for producing fusion polypeptides are known in the art, and include linking the coding sequences encoding the polypeptides so that they are in-frame and that expression of the fused polypeptide is under control of the same promoter(s) and terminator. Fusion proteins can also be constructed using intein technology in which fusions are created post-translationally (Cooper et al., 1993, EMBO J. 12: 2575-2583; Dawson et al., 1994, Science 266: 776-779 ).
[000123] A fusion polypeptide may further comprise a cleavage site between two polypeptides. After secretion of the fusion protein, the site is cleaved releasing the two polypeptides. Examples of cleavage sites include, but are not limited to, the sites disclosed in Martin et al., 2003, J. Ind. Microbiol. Biotechnol. 3:568-576; Svetina et al., 2000, J. Biotechnol. 76:245-251; Rasmussen-Wilson et al., 1997, Appl. Environ. Microbiol. 63: 34883493; Ward et al., 1995, Biotechnology 13: 498-503; and Contreras et al., 1991, Biotechnology 9: 378-381; Eaton et al., 1986, Biochemistry 25: 505-512; Collins-Racie et al., 1995, Biotechnology 13: 982-987; Carter et al., 1989, Proteins: Structure, Function, and Genetics 6:240-248; and Stevens, 2003, Drug Discovery World 4: 35-48. Preparation of variants
[000124] The present invention also relates to methods of obtaining a variant with alpha-amylase activity, comprising: (a) introducing into a parent alpha-amylase a change in two or more (several) positions corresponding to positions 140, 181 , 189, 134, 195, 206, 243, 260, 262, 284, 304, 347, 439, 469, 476 and 477 of the mature polypeptide of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, or SEQ ID NO: 12, wherein the numbering is in accordance with SEQ ID NO 1 and the variant has alpha-amylase activity; and (b) recovering the variant.
[000125] In one aspect, the invention relates to a method of obtaining a variant with alpha-amylase activity, comprising: (a) introducing into a parent alpha-amylase a change in two or more (several) positions corresponding to W140 , R181, W189, D134, N195, V206, Y243, E260, F262, W284, G304, W347, W439, W469, G476 and G477 of the mature polypeptide of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, or SEQ ID NO: 12, wherein the numbering is in accordance with SEQ ID NO 1 and the variant has alpha-amylase activity; and (b) recovering the variant.
[000126] In one embodiment, the change introduced is a replacement.
[000127] In yet another embodiment, the invention relates to a method of obtaining a variant with alpha-amylase activity, comprising: (a) introducing into a parent alpha-amylase a substitution at two or more (several) positions corresponding to G304RKEQ, W140YF, W189EGT, D134E, E260ADCQLMFPSWVGHIKNRTY, F262GP, W284DHFYR, W347HFY, W439RG, G476EQRK, G477EQKMR of the mature polypeptide of SEQ ID NO: 1, SEQ ID NO: 3, SEQ ID NO: 2, SEQ ID: , SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, or SEQ ID NO: 12, wherein the numbering is in accordance with SEQ ID NO 1 and the variant has alpha-amylase activity; and (b) recovering the variant.
[000128] In a preferred embodiment, the substitutions introduced are two or more of G304R, W140YF, W189EGT, D134E, E260GHIKNRTY, W284DFR, W439RG, G476EK, G477EKMR. In a preferred embodiment, the substitutions introduced are G304R, W140YF, E260GHIKNPRTY and G476EQRK. In an even more preferred embodiment, the method of obtaining a variant with alpha-amylase activity comprises: (a) introducing into a parent alpha-amylase substitutions of G304R, W140Y, E260G and G476K in any of SEQ ID NO: 1 , SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, or SEQ ID NO: 12, wherein the numbering is in accordance with SEQ ID NO 1 and the variant has alpha-amylase activity; and (b) recovering the variant. Variants can be prepared using any mutagenesis procedure known in the art, such as site-directed mutagenesis, synthetic gene construction, semi-synthetic gene construction, random mutagenesis, scrambling, etc.
[000129] Site-directed mutagenesis is a technique in which one or more (several) mutations are created at one or more defined sites in a polynucleotide encoding the parent.
[000130] Site-directed mutagenesis can be achieved in vitro by PCR involving the use of oligonucleotide primers containing the desired mutation. Site-directed mutagenesis can also be performed in vitro by cassette mutagenesis involving cleavage by a restriction enzyme at a site on the plasmid comprising a polynucleotide encoding the parent and subsequent ligation of an oligonucleotide containing the mutation in the polynucleotide. Normally the restriction enzyme that digests in plasmid and oligonucleotide is the same, allowing the insertion of sticky ends into the plasmid to link them together. See, for example, Scherer and Davis, 1979, Proc. Natl. Academic Sci. USA 76:4949-4955; and Barton et al., 1990, Nucleic Acids Res. 18: 7349-4966.
[000131] Site-directed mutagenesis can also be achieved in vivo by methods known in the art. See, for example, U.S. Patent Application Publication No. 2004/0171154; Storici et al., 2001, Nature Biotechnol. 19: 773-776; Kren et al., 1998, Nat. Med. 4: 285-290; and Calissano and Macino, 1996, Fungal Genet. Newslett. 43: 15-16.
[000132] Any site-directed mutagenesis procedure can be used in the present invention. There are many commercial kits available that can be used to prepare variants.
[000133] The synthetic gene construction implies in vitro synthesis of a polynucleotide molecule designed to encode a polypeptide of interest. Gene synthesis can be performed using various techniques, such as the multiplex microchip-based technology described by Tian et al. (2004, Nature 432: 1050-1054) and similar technologies in which oligonucleotides are synthesized and assembled on photoprogrammable microfluidic chips.
[000134] Single or multiple amino acid substitutions, deletions, and/or insertions can be made and tested using known methods of mutagenesis, recombination and/or scrambling, followed by a relevant screening procedure such as those revealed by Reidhaar-Olson and Sauer, 1988, Science 241: 53-57; Bowie and Sauer, 1989, Proc. Natl. Academic Sci. USA 86: 2152-2156; WO 95/17413; or WO 95/22625. Other methods that can be used include error exposed PCR, phage expression (eg, Lowman et al., 1991, Biochemistry 30: 10832-10837; US patent No. 5,223,409; WO 92/06204) and region-directed mutagenesis ( Derbyshire et al., 1986, Gene 46: 145; Ner et al., 1988, DNA 7: 127).
High-throughput mutagenesis/shuffling methods, automated screening methods can be combined to detect the activity of mutagenized cloned polypeptides expressed by host cells (Ness et al., 1999, Nature Biotechnology 17: 893-896). Mutagenized DNA molecules encoding active polypeptides can be recovered from host cells and rapidly sequenced using standard methods known in the art. These methods allow for the rapid determination of the importance of individual amino acid residues in a polypeptide.
[000136] Semi-synthetic gene construction is achieved by combining aspects of synthetic gene construction, and/or site-directed mutagenesis, and/or random mutagenesis and/or shuffling. The semi-synthetic construct is typified by a process using polynucleotide fragments that are synthesized, in combination with PCR techniques. Defined regions of genes can thus be synthesized de novo, while other regions can be amplified using site-specific mutagenic primers, while other regions can be subject to error-prone PCR amplification or non-error-prone PCR amplification. Polynucleotide subsequences can then be shuffled. Variants
[000137] The present invention also provides variants of a parent alpha-amylase, comprising a change in two or more (several) positions corresponding to positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477 of the mature polypeptide of SEQ ID NO: 1, and wherein each change is independently a substitution, insertion or deletion (preferably a substitution) and the variant has alpha-amylase activity. In this way, variants are provided with better low temperature washing performance when compared to the parent alpha-amylase or the alpha-amylase of SEQ ID NO: 1, 2, 3, 4, 5, 6, 7, 8, 9 , 10, 11 or 12.
[000138] In one embodiment, the variant has sequence identity of at least 80%, for example at least 85%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98%, or at least 99%, but less than 100%, with the amino acid sequence of the parent alpha-amylase.
[000139] In another embodiment, the invention relates to isolated variants of an alpha-amylase, comprising a change in two or more (several) positions corresponding to positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477 of the mature polypeptide of SEQ ID NO: 1, wherein each change is independently a substitution, deletion or insertion, and wherein the variant has at least 80% but less than 100% identity of sequence with the mature polypeptide of any of SEQ ID NOs 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, and wherein the variant has alpha-amylase activity.
[000140] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 1.
[000141] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO:2.
[000142] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 3.
[000143] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 4.
[000144] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 5.
[000145] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 6.
[000146] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 7.
[000147] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 8.
[000148] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 9.
[000149] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 10.
[000150] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 11.
[000151] In another embodiment, the variant has sequence identity of at least 85%, at least 87%, at least 90%, at least 95%, at least 96%, at least 97%, at least 98% and at least 99%, but less than 100%, with the mature polypeptide of SEQ ID NO: 12.
[000152] In one aspect, the number of changes in variants of the present invention is 2-20, for example 2-10 and 2-5, such as changes 2, 3, 4, 5, 6, 7, 8, 9 or 10.
[000153] In one aspect, the variant comprises a change in two or more (several) positions comprising to positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477. In another aspect, the variant comprises a change in two positions corresponding to any one of positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477. In another aspect, the variant comprises a three position change corresponding to any one of positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477. In another aspect, the variant comprises a four-position change corresponding to any one of positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477. In another aspect, the variant comprises a change in five positions corresponding to any one of positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477. In another aspect, the variant comprises a change in six positions corresponding to any one of positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477. In another aspect, the variant comprises a change in each position corresponding to positions G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477. The positions correspond to the positions of SEQ ID NO: 1. It is preferred that the changes are substitutions.
[000154] In one embodiment, the variant comprises a substitution in two, three or four positions selected from the group consisting of G304, W140, W189, D134, E260, F262, W284, W347, W439, W469, G476 and G477.
[000155] In a preferred embodiment, the variant comprises a substitution in two, three or four positions selected from the group consisting of G304, W140, E260 and G476.
[000156] In one aspect of the invention, the variant comprises two or more (several) substitutions selected from the group consisting of G304RKEQ, W140YF, W189EGT, D134E, E260ADCQLMFPSWVGHIKNRTY, F262GP, W284DHFYR, W347HFY, W439RG, G476EQRK, K476EQRK
[000157] It is preferred that the variant according to the invention comprises substitutions at two, three or four positions selected from the group consisting of G304R, W140YF, E260GHIKNPRTY and G476EQRK. In a more preferred embodiment, two-, three- or four-position substitutions are selected from the group consisting of G304R, W140Y, E260G and G476K.
[000158] In one embodiment, the variant further comprises one or more substitutions selected from the group consisting of T51IL, S52Q, N54K, G109A, E194D, N195F, V206Y, Y243F, G109A, G273DV, G337N, K72R, R181H, S303G and Y100I. In a preferred embodiment, the one or more substitutions are selected from the group consisting of N195F, V206Y, Y243F. Preferably, the variant comprises two or three such substitutions. In this way, variants are provided that have better low temperature wash performance as well as improved stability to Ca2+ depletion compared to the parent alpha-amylase or the alpha-amylase of SEQ ID NO: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12.
[000159] In another aspect of the invention, the variant comprises two or more (various) substitutions of the mature polypeptide of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO : 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11, or SEQ ID NO: 12, selected from the group consisting of of D134E, E260G, E260H, E260I, E260K, E260N, E260R, E260T, G109A, G273D, G273V, G337N, G476E, G477E, G477M, G477R, K72R, R181H, S303G, W140F, WT189G, WY, WY and Y100I.
[000160] Variants may further comprise a change in one or more (several) positions. For example, variants may comprise a change in one position corresponding to positions G182*+D183* or D183*+G184*.
[000161] In another aspect, the invention relates to variants comprising substitutions at positions corresponding to positions of the polypeptide of SEQ ID NO: 1, selected from the group consisting of:
[000162] W140Y+N195F+V206Y+Y243F+E260G+G477E,
[000163] W140Y+N195F+V206Y+Y243F+E260T+W284D,
[000164] W140Y+N195F+V206Y+Y243F+W284D,
[000165] G109A+W140Y+N195F+V206Y+Y243F+E260G,
[000166] W140Y+N195F+V206Y+Y243F+E260G,
[000167] N195F+V206Y+Y243F+E260K+W284D,
[000168] D134E+G476E,
[000169] W140Y+N195F+V206Y+Y243F+E260G+G476E,
[000170] W140Y+W189G+N195F+V206Y+Y243F+E260G,
[000171] W140Y+N195F+V206Y+Y243F+E260G+S303G,
[000172] W140Y+W189T+N195F+V206Y+Y243F+E260G,
[000173] W140Y+N195F+V206Y+Y243F+E260G+W284D,
[000174] Y100I+W140Y+N195F+V206Y+Y243F+E260G,
[000175] W140Y+N195F+V206Y+Y243F+E260G+G337N,
[000176] W140Y+ N195F+ V206Y+ Y243F+ E260G+ W439R
[000177] G109A+ W140Y+ E194D+ N195F+ V206Y+ Y243F+ E260G
[000178] G109A+ W140Y+ N195F+ V206Y+ Y243F+ E260G+ G476E
[000179] T51I+ Y100I+ G109A+ W140Y+ N195F+ V206Y+ Y243F+E260G
[000180] T51I+ G109A+ W140Y+ N195F+ V206Y+ Y243F+ E260G+ W439R
[000181] T51I+ S52Q+ N54K+ G109A+ W140Y+ N195F+ V206Y+Y243F+ E260G+ G476E
[000182] W140Y+ N195F+ V206Y+ Y243F+ E260G+ G304R+ G476K
[000183] W140Y+ N195F+ V206Y+ Y243F+ E260G+ W284R+ G477K
[000184] W140Y+ N195F+ V206Y+ Y243F+ E260G+ W284F+ G477R, and
[000185] N195F+ V206Y+ Y243F+ E260G+ W284D.
[000186] In another aspect, the invention relates to variants consisting of substitutions at positions corresponding to positions of the polypeptide of SEQ ID NO: 1, selected from the group consisting of:
[000187] W140Y+N195F+V206Y+Y243F+E260G+G477E,
[000188] W140Y+N195F+V206Y+Y243F+E260T+W284D,
[000189] W140Y+N195F+V206Y+Y243F+W284D,
[000190] G109A+W140Y+N195F+V206Y+Y243F+E260G,
[000191] W140Y+N195F+V206Y+Y243F+E260G,
[000192] N195F+V206Y+Y243F+E260K+W284D,
[000193] D134E+G476E,
[000194] W140Y+N195F+V206Y+Y243F+E260G+G476E,
[000195] W140Y+W189G+N195F+V206Y+Y243F+E260G,
[000196] W140Y+N195F+V206Y+Y243F+E260G+S303G,
[000197] W140Y+W189T+N195F+V206Y+Y243F+E260G,
[000198] W140Y+N195F+V206Y+Y243F+E260G+W284D,
[000199] Y100I+W140Y+N195F+V206Y+Y243F+E260G,
[000200] W140Y+N195F+V206Y+Y243F+E260G+G337N,
[000201] W140Y+ N195F+ V206Y+ Y243F+ E260G+ W439R
[000202] G109A+ W140Y+ E194D+ N195F+ V206Y+ Y243F+ E260G
[000203] G109A+ W140Y+ N195F+ V206Y+ Y243F+ E260G+ G476E
[000204] T51I+ Y100I+ G109A+ W140Y+ N195F+ V206Y+ Y243F+E260G
[000205] T51I+ G109A+ W140Y+ N195F+ V206Y+ Y243F+ E260G+W439R
[000206] T51I+ S52Q+ N54K+ G109A+ W140Y+ N195F+ V206Y+Y243F+ E260G+ G476E
[000207] W140Y+ N195F+ V206Y+ Y243F+ E260G+ G304R+ G476K
[000208] W140Y+ N195F+ V206Y+ Y243F+ E260G+ W284R+ G477K
[000209] W140Y+ N195F+ V206Y+ Y243F+ E260G+ W284F+ G477R, and
[000210] N195F+ V206Y+ Y243F+ E260G+ W284D.
[000211] In another aspect, the invention relates to variants comprising changes in positions corresponding to positions of the polypeptide of SEQ ID NO: 1, selected from the group consisting of:
[000212] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+G477E,
[000213] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260T+W284D,
[000214] D183*+ G184*+W140Y+N195F+V206Y+Y243F+W284D,
[000215] D183*+G184*+G109A+W140Y+N195F+V206Y+Y243F+E260G,
[000216] D183*+ G184*+ W140Y+N195F+V206Y+Y243F+E260G,
[000217] D183*+ G184*+ N195F+V206Y+Y243F+E260K+W284D,
[000218] D183*+ G184*+ D134E+G476E,
[000219] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+G476E,
[000220] D183*+G184*+W140Y+W189G+N195F+V206Y+Y243F+E260G,
[000221] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+S303G,
[000222] D183*+G184*+W140Y+W189T+N195F+V206Y+Y243F+E260G,
[000223] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+W284D,
[000224] D183*+G184*+Y100I+W140Y+N195F+V206Y+Y243F+E260G,
[000225] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+G337N,
[000226] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+W439R
[000227] D183*+ G184*+ G109A+ W140Y+ E194D+ N195F+ V206Y+Y243F+ E260G
[000228] D183*+ G184*+ G109A+ W140Y+ N195F+ V206Y+ Y243F+E260G+ G476E
[000229] D183*+ G184*+ T51I+ Y100I+ G109A+ W140Y+ N195F+V206Y+ Y243F+ E260G
[000230] D183*+ G184*+ T51I+ G109A+ W140Y+ N195F+ V206Y+Y243F+ E260G+ W439R
[000231] D183*+ G184*+ T51I+ S52Q+ N54K+ G109A+ W140Y+N195F+ V206Y+ Y243F+ E260G+ G476E
[000232] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+G304R+ G476K
[000233] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+W284R+ G477K
[000234] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+W284F+ G477R, and
[000235] D183*+ G184*+ N195F+ V206Y+ Y243F+ E260G+ W284D.
[000236] In another aspect, the invention relates to variants consisting of changes in positions corresponding to positions of the polypeptide of SEQ ID NO: 1, selected from the group consisting of:
[000237] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+ G477E,
[000238] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260T+W284D,
[000239] D183*+ G184*+W140Y+N195F+V206Y+Y243F+W284D,
[000240] D183 *+G184*+G109A+W140Y+N195F+V206Y+Y243F+E260G,
[000241] D183*+ G184*+ W140Y+N195F+V206Y+Y243F+E260G,
[000242] D183*+ G184*+ N195F+V206Y+Y243F+E260K+W284D,
[000243] D183*+ G184*+ D134E+G476E,
[000244] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+G476E,
[000245] D183*+G184*+W140Y+W189G+N195F+V206Y+Y243F+E260G,
[000246] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+S303G,
[000247] D183*+G184*+W140Y+W189T+N195F+V206Y+Y243F+E260G,
[000248] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+W284D,
[000249] D183*+G184*+Y100I+W140Y+N195F+V206Y+Y243F+E260G,
[000250] D183*+G184*+W140Y+N195F+V206Y+Y243F+E260G+G337N,
[000251] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+W439R
[000252] D183*+ G184*+ G109A+ W140Y+ E194D+ N195F+ V206Y+Y243F+ E260G
[000253] D183*+ G184*+ G109A+ W140Y+ N195F+ V206Y+ Y243F+E260G+ G476E
[000254] D183*+ G184*+ T51I+ Y100I+ G109A+ W140Y+ N195F+V206Y+ Y243F+ E260G
[000255] D183*+ G184*+ T51I+ G109A+ W140Y+ N195F+ V206Y+Y243F+ E260G+ W439R
[000256] D183*+ G184*+ T51I+ S52Q+ N54K+ G109A+ W140Y+N195F+ V206Y+ Y243F+ E260G+ G476E
[000257] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+G304R+ G476K
[000258] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+W284R+ G477K
[000259] D183*+ G184*+ W140Y+ N195F+ V206Y+ Y243F+ E260G+W284F+ G477R, and
[000260] D183*+ G184*+ N195F+ V206Y+ Y243F+ E260G+ W284D
[000261] Essential amino acids can be identified in a parent according to procedures known in the art, such as site-directed mutagenesis or alanine-scan mutagenesis (Cunningham and Wells, 1989, Science 244: 1081-1085). In the prior art, single alanine mutations are introduced at all residues of the molecule, and the resulting mutant molecules are tested for alpha-amylase activity to identify amino acid residues critical to the molecule's activity. See also, Hilton et al., 1996, J. Biol. Chem. 271: 4699-4708. The active site of alpha-amylase or other biological interaction can also be determined by physical analysis of the structure, as determined by techniques such as nuclear magnetic resonance, crystallography, electron diffraction, or photoaffinity tagging, in conjunction with site-site amino acid mutation. putative contact. See, for example, de Vos et al., 1992, Science 255: 306-312; Smith et al., 1992, J. Mol. Biol. 224: 899-904; Wlodaver et al., 1992, FEBS Lett. 309:59-64. Essential amino acid identities can also be inferred from analysis of identities to parent-related polypeptides. Polynucleotides
[000262] The present invention also relates to isolated polynucleotides encoding any of the variants of the present invention. Nucleic Acid Constructs
[000263] The present invention also relates to nucleic acid constructs comprising a polynucleotide encoding a variant of the present invention operably linked to one or more (several) control sequences that direct expression of the coding sequence in a suitable host cell under conditions compatible with the control sequences.
[000264] A polynucleotide can be manipulated in various ways to provide for the expression of a variant. Manipulation of the polynucleotide prior to insertion into a vector may be desirable or necessary depending on the expression vector. Techniques for modifying polynucleotides using recombinant DNA methods are well known in the art.
[000265] The control sequence can be a promoter sequence recognized by a host cell for expression of the polynucleotide. The promoter sequence contains transcriptional control sequences that mediate expression of the variant. The promoter can be any nucleic acid sequence that shows transcriptional activity in the host cell, including mutant, truncated and hybrid promoters, and can be obtained from genes encoding extracellular or intracellular polypeptides homologous or heterologous to the host cell.
[000266] Examples of suitable promoters to direct the transcription of nucleic acid constructs of the present invention in a bacterial host cell are the promoters obtained from the alpha-amylase gene Bacillus amyloliquefaciens (amyQ), alpha-amylase gene Bacillus licheniformis (amyL), gene Bacillus licheniformis penicillinase (penP), maltogenic amylase gene Bacillus stearothermophilus (amyM), levansucrase gene Bacillus subtilis (sacB), Bacillus subtilis xylA and xylB genes, E. coli lac operon, agarase gene Streptomyces coelicolor (dagA) gene, and gene prokaryotic beta-lactamase (Villa-Kamaroff et al., 1978, Proc. Natl. Acad. Sci. USA 75: 3727-3731), as well as the tac promoter (DeBoer et al., 1983, Proc. Natl. Acad. Sci. USA 80: 21-25). Further promoters are described in "Useful proteins from recombinant bacteria" by Gilbert et al., 1980, Scientific American 242: 74-94; and in Sambrook et al., 1989, supra.
[000267] Examples of suitable promoters to direct the transcription of nucleic acid constructs of the present invention in a filamentous fungal host cell are the promoters obtained from the genes of acetamidase Aspergillus nidulans, neutral alpha-amylase Aspergillus niger, stable acid alpha-amylase Aspergillus niger , Aspergillus niger or Aspergillus awamori glucoamylase (glaA), TAKA amylase Aspergillus oryzae, alkaline protease Aspergillus oryzae, triose phosphate isomerase Aspergillus oryzae, trypsin-like protease Fusarium oxysporum (WO 96/00787), Fusaria ventum Fusarium venenatum (WO 00/56900), Quinn Fusarium venenatum (WO 00/56900), Rhizomucor miehei lipase, Rhizomucor miehei aspartic proteinase, Trichoderma reesei beta-glucosidase, cellobiohydrolase I Trichoderma reesei, Trichoderma reglucei, cellobioderma reglucei endochoanase II II Trichoderma reesei, endoglucanase III Trichoderma reesei, endoglucanase I V Trichoderma reesei, endoglucanase V Trichoderma reesei, xylanase I Trichoderma reesei, xylanase II Trichoderma reesei, beta-xylosidase Trichoderma reesei, as well as the NA2-tpi promoter (a modified promoter including a gene encoding a neutral alpha-amylase in Aspergilli in which the untranslated leader was replaced by an untranslated leader from a gene encoding triose phosphate isomerase in Aspergilli; non-limiting examples include modified promoters including the gene encoding neutral alpha-amylase in Aspergillus niger in which the untranslated leader has been replaced by an untranslated leader from the gene encoding triose phosphate isomerase in Aspergillus nidulans or Aspergillus oryzae); and their mutant, truncated and hybrid promoters.
[000268] In a yeast host, useful promoters are obtained from the genes for Saccharomyces cerevisiae enolase (ENO-1), Saccharomyces cerevisiae galactokinase (GAL1), alcohol dehydrogenase/glyceraldehyde-3-phosphate dehydrogenase (ADH1, ADH2/GAP) Saccharomyces cerevisiae, triose phosphate isomerase (TPI) Saccharomyces cerevisiae, metallothionein Saccharomyces cerevisiae (CUP1), and 3-phosphoglycerate kinase Saccharomyces cerevisiae. Other useful promoters for yeast host cells are described by Romanos et al., 1992, Yeast 8: 423-488.
[000269] The control sequence may also be a suitable transcription terminator sequence that is recognized by a host cell to terminate transcription. The terminator sequence is operably linked to the 3' terminus of the polynucleotide encoding the variant. Any terminator that is functional in the host cell can be used.
[000270] Preferred terminators for filamentous fungal host cells are obtained from the genes for anthranilate synthase Aspergillus nidulans, Aspergillus niger alpha-glucosidase, Aspergillus niger glucoamylase, TAKA amylase Aspergillus oryzae and trypsin-like protease Fusarium oxysporum.
[000271] Preferred terminators for host cells are obtained from the genes for Saccharomyces cerevisiae enolase, Saccharomyces cerevisiae cytochrome C (CYC1) and Saccharomyces cerevisiae glyceraldehyde-3-phosphate dehydrogenase. Other useful terminators for yeast host cells are described by Romanos et al., 1992, supra.
[000272] The control sequence may also be a suitable leader sequence, an untranslated region of an mRNA that is important for translation by the host cell. The leader sequence is operably linked to the 5' terminus of the polynucleotide encoding the variant. Any leader sequence that is functional in the host cell can be used.
[000273] Preferred leaders for filamentous fungal host cells are obtained from the genes for TAKA amylase Aspergillus oryzae and triose phosphate isomerase Aspergillus nidulans.
[000274] Suitable leaders for yeast host cells are obtained from the genes for Saccharomyces cerevisiae enolase (ENO-1), 3-phosphoglycerate kinase Saccharomyces cerevisiae, Saccharomyces cerevisiae alpha factor and Saccharomyces cerevisiae alcohol dehydrogenase (glyceraldehyde 3-phosphate) ADH2/GAP).
[000275] The control sequence can also be a polyadenylation sequence, a sequence operably linked to the 3' terminus of the variant coding sequence and, when transcribed, is recognized by the host cell as a signal to add polyadenosine residues to transcribed mRNA . Any polyadenylation sequence that is functional in the host cell can be used.
Preferred polyadenylation sequences for filamentous fungal host cells are obtained from the genes for anthranilate synthase Aspergillus nidulans, Aspergillus niger glucoamylase, Aspergillus niger alpha-glucosidase, TAKA amylase Aspergillus oryzae and trypsin-like protease by Fusarium oxys.
Useful polyadenylation sequences for yeast host cells are described by Guo and Sherman, 1995, Mol. Cellular Biol. 15:5983-5990.
[000278] The control sequence may also be a signal peptide coding region that encodes a signal peptide linked to the N-terminus of a variant and directs the variant into the secretory pathway of the cell. The 5' end of the polynucleotide coding sequence may inherently contain a signal peptide coding region naturally linked in translation reading frame to the segment of the coding region encoding the variant. Alternatively, the 5' end of the coding sequence may contain a signal peptide coding region which is foreign to the coding sequence. The foreign signal peptide coding region may be required when the coding sequence does not naturally contain a signal peptide coding region. Alternatively, the foreign signal peptide coding region may simply replace the natural signal peptide coding region in order to improve secretion of the variant. However, any signal peptide coding region that directs the expressed variant into the secretory pathway of a host cell can be used.
[000279] Effective signal peptide coding sequences for bacterial host cells are the signal peptide coding sequences obtained from the genes for maltogenic amylase Bacillus NCIB 11837, subtilisin Bacillus licheniformis, beta-lactamase Bacillus licheniformis, alpha-amylase Bacillus stearothermophilus, Bacillus stearothermophilus (nprT, nprS, nprM) neutral proteases, and Bacillus subtilis prsA. Other signal peptides are described by Simonen and Palva, 1993, Microbiological Reviews 57: 109-137.
[000280] Effective signal peptide coding sequences for filamentous fungal host cells are the signal peptide coding sequences obtained from genes for neutral amylase Aspergillus niger, glucoamylase Aspergillus niger, TAKA amylase Aspergillus oryzae, cellulase Humicola insolens, endomycolaglucanase V insolens, Humicola lanuginosa lipase and Rhizomucor miehei aspartic proteinase.
[000281] Useful signal peptides for yeast host cells are obtained from genes for Saccharomyces cerevisiae alpha factor and Saccharomyces cerevisiae invertase. Other useful signal peptide coding sequences are described by Romanos et al., 1992, supra.
[000282] The control sequence may also be a propeptide coding region that encodes a propeptide positioned at the N-terminus of a variant. The resulting polypeptide is known as a proenzyme or propolypeptide (or a zymogen in some cases). A propolypeptide is generally inactive and can be converted to an active polypeptide by catalytic or autocatalytic cleavage of the propeptide from the propolypeptide. The propeptide coding region can be obtained from the genes for Bacillus subtilis alkaline protease (aprE), Bacillus subtilis (nprT) neutral protease, Myceliophthora thermophila laccase (WO 95/33836), Rhizomucor miehei aspartic proteinase, and Saccharomyces cerevisiae alpha factor.
When both signal peptide and propeptide regions are present at the N-terminus of a variant, the propeptide region is positioned near the N-terminus of the variant and the signal peptide region is positioned near the N-terminus of the propeptide region.
[000284] It may also be desirable to add regulatory sequences that allow regulation of variant expression relative to host cell growth. Examples of regulatory systems are those that cause gene expression to be turned on or off in response to a chemical or physical stimulus, including the presence of a regulatory compound. Regulatory systems in prokaryotic systems include the lac, tac and trp operator systems. In yeast, either the ADH2 system or the GAL1 system can be used. In filamentous fungi, the Aspergillus niger glucomylase promoter, the Aspergillus oryzae TAKA alpha-amylase promoter and the Aspergillus oryzae glucoamylase promoter can be used. Other examples of regulatory sequences are those that allow gene amplification. In eukaryotic systems, these regulatory sequences include the dihydrofolate reductase gene that is amplified in the presence of methotrexate, and metallothionein genes that are amplified with heavy metals. In such cases, the polynucleotide encoding the variant would be operably linked to the regulatory sequence. expression vectors
[000285] The present invention also concerns recombinant expression vectors comprising a polynucleotide of the present invention, a promoter, and transcriptional and translational stop signals. The various nucleotide and control sequences can be put together to produce a recombinant expression vector that can include one or more (several) convenient restriction sites to allow insertion or replacement of the polynucleotide encoding the variant such sites. Alternatively, the polynucleotide can be expressed by inserting the polynucleotide or a nucleic acid construct comprising the polynucleotide into an appropriate vector for expression. When creating the expression vector, the coding sequence is located in the vector such that the coding sequence is operably linked to the appropriate control sequences for expression.
[000286] The recombinant expression vector can be any vector (for example, a plasmid or virus) that can be conveniently subjected to recombinant DNA procedures and can elicit the expression of the polynucleotide. The choice of vector will typically depend on the compatibility of the vector with the host cell into which the vector will be introduced. The vector can be a linear or closed circular plasmid.
[000287] The vector can be an autonomously replicating vector, that is, a vector that exists as an extrachromosomal entity, whose replication is independent of chromosomal replication, for example, a plasmid, an extrachromosomal element, a minichromosome or an artificial chromosome. The vector can contain any means to ensure self-replication. Alternatively, the vector may be one that, when introduced into the host cell, is integrated into the genome and replicated along with the chromosome(s) into which it has been integrated. Furthermore, a single vector or plasmid or two or more vectors or plasmids which together contain the total DNA to be introduced into the genome of the host cell, or a transposon can be used.
[000288] The vector preferably contains one or more (several) selectable markers that allow to easily select transformed, transfected, transduced or similar cells. A selectable marker is a gene whose product provides biocidal or viral resistance, heavy metal resistance, auxotroph prototrophy, and the like.
[000289] Examples of bacterial selectable markers are the dal genes from Bacillus licheniformis or Bacillus subtilis, or markers that confer antibiotic resistance such as ampicillin, chloramphenicol, kanamycin or tetracycline resistance. Suitable markers for yeast host cells are ADE2, HIS3, LEU2, LYS2, MET3, TRP1 and URA3. Selectable markers for use in a filamentous fungal host cell include, but are not limited to, amdS (acetamidase), argB (ornithine carbamoyltransferase), bar (phosphinothricin acetyltransferase), hph (hygromycin phosphotransferase), niaD (nitrate reductase), pyrG (orotidine -5'-phosphate decarboxylase), sC (sulfate adenyltransferase) and trpC (anthranilate synthase), as well as their equivalents. Of preferred use in an Aspergillus cell are the amdS and pyrG genes from Aspergillus nidulans or Aspergillus oryzae and the bar gene from Streptomyces hygroscopicus.
[000290] The vector preferably contains one or more elements that allow the integration of the vector into the host cell genome or replication of the vector in the cell independent of the genome.
[000291] For integration into the host cell genome, the vector can rely on the polynucleotide sequence encoding the variant or any other element of the vector for integration into the genome by homologous or non-homologous recombination. Alternatively, the vector may contain additional nucleotide sequences to direct integration by homologous recombination into the host cell genome at one or more precise locations on the chromosome(s). To increase the probability of integration at a precise location, integrational elements must contain a sufficient number of nucleic acids, such as 100 to 10000 base pairs, 400 to 10000 base pairs and 800 to 10000 base pairs, which have a high degree of identity. with the corresponding target sequence to improve the probability of homologous recombination. Integrational elements can be any sequence that is homologous to the target sequence in the host cell genome. Furthermore, integrational elements can be coding or non-coding nucleotide sequences. On the other hand, the vector can be integrated into the host cell genome by non-homologous recombination.
[000292] For autonomous replication, the vector may further comprise an origin of replication allowing the vector to autonomously replicate in the host cell in question. The origin of replication can be any plasmid replicator mediating autonomous replication that functions in a cell. The term "origin of replication" or "plasmid replicator" means a nucleotide sequence that allows a plasmid or vector to replicate in vivo.
[000293] Examples of bacterial origins of replication are the origins of replication of plasmids pBR322, pUC19, pACYC177 and pACYC184 allowing replication in E. coli, and pUB110, pE194, pTA1060 and pAMβl allowing replication in Bacillus.
[000294] Examples of origins of replication for use in a yeast host cell are the two micron origin of replication ARS1, ARS4, the combination of ARS1 and CEN3, and the combination of ARS4 and CEN6.
[000295] Examples of useful origins of replication in a filamentous fungal cell are AMA1 and ANS1 (Gems et al., 1991, Gene 98: 61-67; Cullen et al., 1987, Nucleic Acids Res. 15: 9163-9175; WO 00/24883). Isolation of the AMA1 gene and construction of plasmids or vectors comprising the gene can be accomplished according to the methods disclosed in WO 00/24883.
[000296] More than one copy of a polynucleotide of the present invention can be inserted into the host cell to increase production of a variant. An increase in polynucleotide copy number can be achieved by integrating at least one additional copy of the sequence into the host cell genome or by including an amplifiable selectable marker gene in the polynucleotide where cells contain amplified copies of the selectable marker gene, and as such additional copies of the polynucleotide can be selected by culturing the cells in the presence of the appropriate selectable agent.
The procedures used to link the elements described above to construct the recombinant expression vectors of the present invention are well known to those skilled in the art (see, for example, Sambrook et al., 1989, supra) to obtain substantially pure variants. host cells
[000298] The present invention also relates to recombinant host cells comprising a polynucleotide of the present invention operatively linked to one or more (various) control sequences that direct the production of a variant of the present invention. A construct or vector comprising a polynucleotide is introduced into a host cell such that the construct or vector is maintained as a chromosomal integrant or as a self-replicating extrachromosomal vector as described above. The term "host cell" encompasses any offspring of a parent cell that is not identical to the parent cell due to mutations that occur during replication. The choice of a host cell will largely depend on the gene encoding the variant and its source.
[000299] The host cell can be any cell useful in the recombinant production of a variant, for example a prokaryote or a eukaryote.
[000300] The prokaryotic host cell can be any gram-positive or gram-negative bacteria. Gram-positive bacteria include, but are not limited to, Bacillus, Clostridium, Enterococcus, Geobacillus, Lactobacillus, Lactococcus, Oceanobacillus, Staphylococcus, Streptococcus and Streptomyces. Gram-negative bacteria include, but are not limited to, Campylobacter, E. coli, Flavobacterium, Fusobacterium, Helicobacter, Ilyobacter, Neisseria, Pseudomonas, Salmonella and Ureaplasma.
[000301] The bacterial host cell can be any Bacillus cell, including, but not limited to, Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillus brevis, Bacillus circulans, Bacillus clausii, Bacillus coagulans, Bacillus firmus, Bacillus lautus, Bacillus lentus, Bacillus cells licheniformis, Bacillus megaterium, Bacillus pumilus, Bacillus stearothermophilus, Bacillus subtilis and Bacillus thuringiensis.
[000302] The bacterial host cell can also be any Streptococcus cell, including, but not limited to, Streptococcus equisimilis, Streptococcus pyogenes, Streptococcus uberis and Streptococcus equi subsp. Zooepidemicus.
The bacterial host cell may also be any Streptomyces cell, including, but not limited to, Streptomyces achromogenes, Streptomyces avermitilis, Streptomyces coelicolor, Streptomyces griseus and Streptomyces lividans cells.
[000304] Introduction of DNA into a Bacillus cell can, for example, be done by protoplast transformation (see, for example, Chang and Cohen, 1979, Mol. Gen. Genet. 168: 111-115), using competent cells ( see, for example, Young and Spizizen, 1961, J. Bacteriol. 81: 823-829, or Dubnau and Davidoff-Abelson, 1971, J. Mol. Biol. 56: 209-221), by electroporation (see, for example, , Shigekawa and Dower, 1988, Biotechniques 6:742-751), or by conjugation (see, for example, Koehler and Thorne, 1987, J. Bacteriol. 169: 5271-5278). Introduction of DNA into an E. coli cell can, for example, be done by protoplast transformation (see, for example, Hanahan, 1983, J. Mol. Biol. 166: 557-580) or electroporation (see, for example, Dower et al., 1988, Nucleic Acids Res. 16: 6127-6145). Introduction of DNA into a Streptomyces cell can, for example, be done by protoplast transformation and electroporation (see, for example, Gong et al., 2004, Folia Microbiol. (Praha) 49: 399-405), by conjugation (see , for example, Mazodier et al., 1989, J. Bacteriol. 171: 3583-3585), or by transduction (see, for example, Burke et al., 2001, Proc. Natl. Acad. Sci. USA 98: 6289 -6294). Introduction of DNA into a Pseudomonas cell can, for example, be done by electroporation (see, for example, Choi et al., 2006, J. Microbiol. Methods 64: 391-397) or by conjugation (see, for example, Pinedo and Smets, 2005, Appl. Environ. Microbiol. 71: 51-57). Introduction of DNA into a Streptococcus cell can, for example, be done by natural competence (see, for example, Perry and Kuramitsu, 1981, Infect. Immun. 32: 1295-1297), by protoplast transformation (see, for example, Catt and Jollick, 1991, Microbios 68: 189-2070, by electroporation (see, for example, Buckley et al., 1999, Appl. Environ. Microbiol. 65: 3800-3804) or by conjugation (see, for example, Clewell , 1981, Microbiol. Rev. 45: 409436) However, any method known in the art to introduce DNA into a host cell can be used.
[000305] The host cell may also be a eukaryotic, such as a mammalian, insect, plant or fungus cell.
[000306] The host cell may be a fungal cell. "Fungi" as used herein includes the phyla Ascomycota, Basidiomycota, Chytridiomycota, and Zygomycota, as well as Oomycota and all mitosporic fungi (as defined by Hawksworth et al., In, Ainsworth and Bisby's Dictionary of The Fungi, 8th edition, 1995, CAB International, University Press, Cambridge, UK).
[000307] The fungal host cell may be a yeast cell. "Yeast" as used herein includes ascosporogenous yeast (Endomycetales), basidiosporogenous yeast, and yeast belonging to the Fungi Imperfecti (Blastomycetes). As the classification of yeast may vary in the future, for purposes of this invention, yeast will be defined as described in Biology and Activities of Yeast (Skinner, FA, Passmore, SM, and Davenport, RR, eds, Soc. App. Bacteriol. Symposium Series No. 9, 1980).
The yeast host cell may be a Candida, Hansenula, Kluyveromyces, Pichia, Saccharomyces, Schizosaccharomyces or Yarrowia cell such as a Kluyveromyces lactis, Saccharomyces carlsbergensis, Saccharomyces cerevisiae, Saccharomyces, Saccharomyces or Saccharomyces diastatic cell oviformis or Yarrowia lipolytica.
[000309] The fungal host cell may be a filamentous fungal cell. "Filaneous fungi" includes all filamentous forms of the Eumycota and Oomycota subdivision (as defined by Hawksworth et al., 1995, supra). Filamentous fungi are generally characterized by a mycelial wall composed of chitin, cellulose, glucan, chitosan, mannan and other complex polysaccharides. Vegetative growth occurs by elongation of hyphae and carbon catabolism is necessarily aerobic. In contrast, vegetative growth by yeasts such as Saccharomyces cerevisiae takes place through unicellular stem flowering and carbon catabolism can be fermentative.
[000310] The filamentous fungal host cell may be an Acremonium, Aspergillus, Aureobasidium, Bjerkandera, Ceriporiopsis, Chrysosporium, Coprinus, Coriolus, Cryptococcus, Filibasidium, Fusarium, Humicola, Magnaporthe, Mucor, Neo, Myceliophix, Penecumthora cell Phanerochaete, Phlebia, Piromyces, Pleurotus, Schizophyllum, Talaromyces, Thermoascus, Thielavia, Tolypocladium, Trametes or Trichoderma.
[000311] For example, the filamentous fungal host cell may be a cell Aspergillus awamori, Aspergillus foetidus, Aspergillus fumigatus, Aspergillus japonicus, Aspergillus nidulans, Aspergillus niger, Aspergillus oryzae, Bjerkandera adustei caresiporiopsis, Ceriporiopsis, Ceriporiopsis , Ceriporiopsis rivulose, Ceriporiopsis subrufa, Ceriporiopsis subvermispora, Chrysosporium inops, Chrysosporium keratinophilum, lucknowense Chrysosporium, Chrysosporium merdarium, Chrysosporium pannicola, Chrysosporium queenslandicum, Chrysosporium tropicum, Chrysosporium zonatum cinereus Coprinus, hirsutus Coriolus, Fusarium bactridioides, cerealis Fusarium crookwellense Fusarium Fusarium culmorum, Fusarium graminearum, Fusarium graminum, Fusarium heterosporum, Fusarium negundi, Fusarium oxysporum, Fusarium reticulatum, Fusarium roseum, Fusarium sambucinum, Fusarium sarcochroum, Fusarium sporotrichioides, Fusarium sulphureum, Fusarium torium rulosum, Fusarium trichothecioides, Fusarium venenatum, Humicola insolens, Humicola lanuginosa, Mucor miehei, Myceliophthora thermophila, Neurospora crassa, Penicillium purpurogenum, Phanerochaete chrysosporium, Phlebia radiata, Pleurotus Tricolor, Tramezia terrestii, verrestii Trichoderma longibrachiatum, Trichoderma reesei or Trichoderma viride.
[000312] Fungal cells can be transformed by a process involving protoplast formation, protoplast transformations and cell wall regeneration in a way known per se. Suitable procedures for transforming Aspergillus and Trichoderma host cells are described in EP 238023 and Yelton et al., 1984, Proc. Natl. Academic Sci. USA 81: 1470-1474. Suitable methods for transforming Fusarium species are described by Malardier et al., 1989, Gene 78: 147-156 and WO 96/00787. Yeast can be transformed using the procedures described by Becker and Guarente, In Abelson, JN and Simon, MI, editors, Guide to Yeast Genetics and Molecular Biology, Methods in Enzymology, Volume 194, pp 182-187, Academic Press, Inc. , New York; Ito et al., 1983, J. Bacteriol. 153:163; and Hinnen et al., 1978, Proc. Natl. Academic Sci. USA 75: 1920. production methods
[000313] The present invention also relates to methods of producing a variant, comprising: (a) culturing a host cell of the present invention under conditions suitable for expression of the variant; and (b) recovering the variant.
[000314] Host cells are cultured in a nutrient medium suitable for production of the variant using methods known in the art. For example, the cell can be cultivated by shake flask cultivation or small or large scale fermentation (including continuous, batch, batch or solid state fermentations) in laboratory or industrial fermenters carried out in a suitable medium and under conditions permitting the polypeptide is expressed and/or isolated. Cultivation takes place in a suitable nutrient medium comprising carbon and nitrogen sources and inorganic salts, using procedures known in the art. Suitable media are available from commercial suppliers or can be prepared in accordance with published compositions (for example, in American Type Culture Collection catalogs). If the variant is secreted into the nutrient medium, the variant can be retrieved directly from the medium. If the variant is not secreted, it can be recovered from cell lysates.
[000315] The variant can be detected using methods known in the art that are specific to the variants. Such detection methods can include the use of specific antibodies, formation of an enzyme product, or disappearance of an enzyme substrate. For example, an enzyme assay can be used to determine variant activity.
[000316] The variant can be recovered by methods known in the art. For example, the variant can be recovered from the nutrient medium by conventional procedures including, but not limited to, collection, centrifugation, filtration, extraction, spray drying, evaporation or precipitation.
[000317] The variant can be purified by various procedures known in the art, including, but not limited to, chromatography (eg, ion exchange, affinity, hydrophobic, chromatofocusing and size exclusion), electrophoretic procedures (eg, preparative isoelectric focusing), differential solubility (eg, ammonium sulfate precipitation), SDS-PAGE or extraction (see, eg, Protein Purification, J.-C. Janson and Lars Ryden, editors, VCH Publishers, New York, 1989) to obtain substantially pure variants.
[000318] In an alternative aspect, the variant is not retrieved, but a host cell of the present invention expressing a variant is used as the source of the variant. Compositions
[000319] The present invention also relates to compositions comprising an embodiment of the present invention. Preferably the compositions are enriched in such a variant. The term "enriched" means that the alpha-amylase activity of the composition has been increased, for example with an enrichment factor of 1.1.
[000320] The composition may comprise a variant as the major enzymatic component, for example a monocomponent composition. Alternatively, the composition may comprise multiple enzymatic activities such as an aminopeptidase, amylase, carbohydrase, carboxypeptidase, catalase, cellulase, chitinase, cutinase, cyclodextrin glycosyltransferase, deoxyribonuclease, esterase, alpha-galactosidase, beta-galactosidase, glucoamylase, alpha-glucosidase -glucosidase, haloperoxidase, invertase, laccase, lipase, mannosidase, oxidase, pectinolytic enzyme, peptidoglutaminase, peroxidase, phytase, polyphenoloxidase, proteolytic enzyme, ribonuclease, transglutaminase or xylanase. The additional enzyme(s) can be produced, for example, by a microorganism belonging to the genus Aspergillus, for example Aspergillus aculeatus, Aspergillus awamori, Aspergillus foetidus, Aspergillus fumigatus, Aspergillus japonicus, Aspergillus nidulans, Aspergillus nigerry or Aspergillus o; Fusarium, e.g. Fusarium bactridioides, Fusarium cerealis, Fusarium crookwellense, Fusarium culmorum, Fusarium graminearum, Fusarium graminum, Fusarium heterosporum, Fusarium negundi, Fusarium oxysporum, Fusarium reticulatum, Fusarium sulusarium, Fusarium phusarium, Fusarium sarambuconum trichothecioides or Fusarium venenatum; Humicola, for example Humicola insolens or Humicola lanuginosa; or Trichoderma, for example Trichoderma harzianum, Trichoderma koningii, Trichodermalongibrachiatum, Trichoderma reesei or Trichoderma viride.
[000321] The compositions can be prepared according to methods known in the art and can be in the form of a liquid or dry composition. For example, the composition can be in the form of a granulate or a microgranule. The variant can be stabilized according to methods known in the art.
[000322] According to the invention, the above alpha-amylase variants may typically be a component in a cleaning composition, such as a detergent composition, for example a laundry detergent composition or a dishwashing detergent composition. A liquid laundry detergent composition is especially preferred.
[000323] Such cleaning compositions comprise a cleaning/detergent adjunct, preferably a mixture of components. Typically, the cleaning adjunct will be present in the composition in an amount of from 0.001 to 99.9% by weight, more typically from 0.01 to 80% by weight of cleaning adjunct.
[000324] In another aspect, the composition comprises one or more surfactants that may be non-ionic, including semi-polar and/or anionic and/or cationic and/or zwitterionic and/or ampholytic and/or semi-polar non-ionic and/ or its mixtures. Surfactants are typically present at a level between 0.1% to 60% by weight or between 0.5 to 50% by weight or 1 to 40% by weight of the composition. Uses
[000325] The present invention is also directed to methods of using the alpha-amylase variants.
[000326] The alpha-amylase variants of the invention are useful in detergent compositions, laundry, dishwashing and/or low temperature cleaning processes.EXAMPLES pNP-G7 assay for determination of alpha-amylase activity
[000327] The alpha-amylase activity can be determined by a method employing the substrate G7-pNP. G7-pNP is an abbreviation for 4,6-ethylidene(G7)-p-nitrophenyl(Gi)-a,D-maltoheptaoside, a blocked oligosaccharide that can be cleaved by an endo-amylase such as an alpha-amylase. Following cleavage, the alpha-glucosidase included in the kit further digests the hydrolyzed substrate to release a yellow colored free PNP molecule which can thus be measured by visible spectrophotometry at X = 405 nm (400-420 nm). Kits containing G7-pNP substrate and alpha-glucosidase are manufactured by Roche/Hitachi (cat. No. 11876473).REAGENTS:
[000328] The G7-pNP substrate of this kit contains 22 mM 4,6-ethylidene-G7-pNP and 52.4 mM HEPES (2-[4-(2-hydroxyethyl)-1-piperazinyl]-ethanesulfonic acid), pH 7.0).
The alpha-glucosidase reagent contains 52.4 mM HEPES, 87 mM NaCl, 12.6 mM MgCfe, 0.075 mM CaCh, > 4 kU/L alpha-glucosidase).
[000330] The substrate working solution is made by mixing 1 ml of the alpha-glucosidase reagent with 0.2 ml of the G7-pNP substrate. This substrate working solution is made just before use.
[000331] Dilution buffer: 50 mM MOPS, 0.05% (w/v) Triton X100 (polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether (C14H22O(C2H4O)n (n = 9-10))), 1mM CaCl2, pH8.0. PROCEDURE:
[000332] The amylase sample to be analyzed was diluted in a dilution buffer to ensure that the pH of the diluted sample is 7. The assay was performed by transferring 20 μl of diluted enzyme samples to a 96-well microtiter plate and adding 80 µl of substrate working solution. The solution was mixed and pre-incubated 1 minute at room temperature and the absorption was measured every 20 seconds over 5 minutes at OD 405 nm.
[000333] The slope (absorbance per minute) of the time-dependent absorption curve is directly proportional to the specific activity (activity per mg of enzyme) of the alpha-amylase in question under the given set of conditions. The amylase sample should be diluted to a level where the slope is below 0.4 absorbance units per minute. Automatic Mechanical Tension Assay (AMSA) for laundry washing
[000334] In order to evaluate the washing performance in washing clothes washing experiments are carried out using the Automatic Mechanical Tension Test (AMSA). With AMSA, the washing performance of a large amount of detergent solutions with a small volume of enzymes can be examined. The AMSA board has several slots for test solutions and a lid tightly squeezing the textile sample to be washed against all slot openings. During the wash time, the plate, test solutions, textile and lid are vigorously shaken to bring the test solution into contact with the textile and apply mechanical tension in a regular and periodically oscillating manner. For a more detailed description, see WO 02/42740, especially the paragraph “Special method embodiments” on page 23-24. Description of general washing performance
[000335] A test solution comprising water (10 °dH), detergent, for example 5.1 g/L of European liquid detergent as described below and the enzyme of the invention, for example at a concentration of 0, 0, is prepared. 8 and/or 1.2 mg protein enzyme/L. Starch stained tissue (eg CS-28 from Center For Testmaterials BV, P.O. Box 120, 3133 KT, Vlaardingen, The Netherlands) is added and washed for 20 minutes at 20°C. After extensive rinsing with running tap water and drying in darkness, the light intensity or reflectance values of the stained fabrics are then measured as a measure of washing performance. The 0 mg protein enzyme/L test is used as a blank to obtain a delta remission value. Preferably, mechanical action is applied during the washing step, for example in the form of shaking, rotating or stirring the washing solution with the fabric.
[000336] The AMSA wash performance experiments were carried out under the experimental conditions specified below: Table 1: AMSA experimental conditions

[000337] Amylase Dilution Buffer: Amylase was diluted in ultrapure water (MilliQ water) with a small concentration of calcium (0.1 mM) to stabilize the amylase during storage and 0.01% Triton X-100 to reduce the risk of protein enzyme adsorption to containers and pipettes.
[000338] The water hardness was adjusted to 10°dH by adding CaCl2, MgCl2 and NaHCO3 (Ca2+:Mg2+:HCO3- = 3:1:4.5) to the test system. After washing, the textiles were rinsed in tap water and dried.
[000339] Washing performance was measured as the color brightness of the washed textile. Brightness can also be expressed as the intensity of light reflected from the sample when illuminated with white light. When the sample is stained, the intensity of the reflected light is less than that of the clean sample. As such, the intensity of reflected light can be used to measure washing performance.
[000340] Color measurements are taken with a Kodak flatbed scanner (iQsmart, Kodak, Midtager 29, DK-2605 Br0ndby, Denmark) which is used to capture an image of the washed textile.
[000341] To extract a value for light intensity from scanned images, the 24-bit pixel values of the image are converted to values for red, green, and blue (RGB). The intensity value (Int) is calculated by adding the RGB values together as vectors and then considering the length of the resulting vector:

[000342] Textiles: Textile sample CS-28 (rice starch cotton) is obtained from Center For Testmaterials BV, P.O. Box 120, 3133 KT Vlaardingen, The Netherlands.
[000343] Results of the AMSA laundry test of different variants are shown in table 3. In the result, the index is 100. The parent alpha-amylase performance result is assigned a value of 100 and the results of the variants are compared to that value. AMSA washing performance
[000344] The washing performance of the variants and corresponding parental alpha-amylases was tested by the AMSA test method as described in the Methods section. Results are given as (variant performance minus blank performance) divided by (parent performance minus blank performance) multiplied by 100, where blank is the performance obtained by washing under the same conditions but in the absence of alpha -amylase. Finally, a relative performance average was calculated at the two concentrations 0.8 and 1.2 Mg/L.
[000345] The results are shown in table 3. Terg-O-tometer (TOM) wash test
[000346] The Terg-O-tometer (TOM) is a medium scale model wash system that can be applied to test 12 different wash conditions simultaneously. A TOM is basically a large temperature-controlled water bath with up to 12 open metal beakers submerged in it. Each beaker constitutes a small vertical load washing machine and during an experiment each will contain a solution of a specific detergent/enzyme system and the dirty, clean fabric where its performance is tested. Mechanical tension is achieved through a rotating stirring arm that stirs the liquid inside each beaker. Since TOM beakers do not have a lid, it is possible to take samples during a TOM experiment and analyze the information online during washing.
[000347] The model TOM washing system is primarily used in medium scale testing of detergents and enzymes under US or LA/AP washing conditions. In a TOM experiment, factors such as the weight-to-dirt ratio and the fabric-to-wash liquor ratio can vary. As such, TOM provides the link between small-scale experiments, such as AMSA and mini-wash, and large-scale experiments that consume more time in vertical load laundry machines.
[000348] Equipment: The water bath with 12 steel beakers and a rotating arm per beaker with a capacity of 500 to 1200 mL of detergent solution. The temperature ranges from 5 to 80 °C. The water bath must be filled with deionized water. The rotational speed can be adjusted from 70 to 120 rpm/min. TOM washing performance
[000349] The water hardness was adjusted to the strength described below by adding CaCl2, MgCl2 and NAHCO3. Wash solutions were prepared with the desired amount of detergent, temperature and water hardness in a bucket as described below. Detergent was dissolved during stirring for 10 minutes. (Wash solution was used within 30 to 60 minutes of preparation).
[000350] The temperature and rotation (rpm) of the water bath in the Terg-O-Tometer have been adjusted according to the definitions below. When the temperature was adjusted according to the settings (tolerance is +/- 0.5°C), washing solution was added to the TOM beaker according to the amount described below.
[000351] The agitation in the beaker occurred at 120 rpm. 2 samples of rice starch (CS-28) and dirt ballast were added to each of the beakers and washed according to the time indicated below. Samples were rinsed in cold tap water for 5 minutes. Samples were allowed to dry in the dark overnight.
[000352] Textile: Textile sample CS-28 (rice starch in cotton) was obtained from Center For Testmaterials BV, P.O. Box 120, 3133 KT Vlaardingen, Netherlands.
[000353] Soil Ballast: Cotton/Polyester Rice Starch Soil Ballast (EMPA 162) was obtained from Center For Testmaterials BV, P.O. Box 120, 3133 KT Vlaardingen, The Netherlands. Bistro sauce (063KC), Frij chocolate smoothie, Heinz spaghetti (113KC), Hershey's double chocolate were obtained from Warwick Equest Ltd, Unit 55, Consett Business Park, Consett, County Durham, DH8 6BN UK.
[000354] Results of the TOM wash test of different variants are shown in table 3. In the result, the index is 100. The parent alpha-amylase performance result (SEQ ID NO:7) is assigned a value of 100 and the variant results are compared to this value.

[000355] The detergents and test materials were as follows:

[000356] Washing performance was measured as the color brightness of the washed textile expressed in remission values. Remission measurements were taken using a Color Eye Macbeth 7000 spectrophotometer. All dry samples were measured. As there is a risk of context interference, the samples were placed on top of 4 tissue layers during the remission measurement. Remission was measured at 460 nm. UV filter not included. A mean remission result in the samples was calculated.Example 1 Washing performance of alpha-amylases with European (EU) (example 1A) and North American (example 1B) (US) liquid detergent
[000357] The washing performance of the tested variant and corresponding parent alpha-amylase (SEQ ID NO: 7) were tested as described below. Results are given as (variant performance minus white performance) divided by (parent performance minus white performance) multiplied by 100; where white is the performance obtained by washing under the same conditions but in the absence of alpha-amylase.Example 1A: European Heavy Duty Liquid Laundry Detergent Composition
1Random graft copolymer is a polyvinyl acetate grafted polyethylene oxide copolymer with a polyethylene oxide backbone and multiple polyvinyl acetate side chains. The molecular weight of the polyethylene oxide backbone is about 6000 and the weight ratio of polyethylene oxide to polyvinyl acetate is about 40 to 60 and no more than 1 graft point per 50 ethylene oxide units. Example 1B: North American Heavy Duty Liquid Laundry Detergent Composition
2Polyethylenimine (MW = 600) with 20 ethoxylated groups per -NH.3Alkoxylated amphiphilic grease cleaning polymer is a polyethylenimine (MW = 600) with 24 ethoxylated groups per -NH and 16 propoxylated groups per -NH.Table 3: Washing performance


[000358] The results of the washing performance test clearly demonstrate that the performances of the variants are improved relative to their respective parent molecule (SEQ ID NO 7) at the temperatures tested.Example 2Large-scale performance evaluation of amylase variants in liquid detergent in washing machine.I. Preparation of detergent test compositions
[000359] In this experiment, four test compositions were prepared based on liquid detergent example 1A. A detergent base was prepared from example 1A, containing no enzymes and finished to pH 8.2.
[000360] The following four detergent formulations were prepared:
*Added as active enzyme protein1Natalase® is an amylase enzyme supplied by Novozymes A/S, Bagsvaerd, Denmark as 'Natalase 200L'.2 Variant 1 is an amylase variant of this invention of wild-type amylase Bacillus sp722SEQ ID NO:1 with as following two deletions D183* + G184* and including replacements W140Y, N195F, V206Y, Y243F, E260G and W284D. Also referenced as SP722 + D183*+ G184* + W140Y + N195F + V206Y + Y243F + E260G + W284D3 Variant 2 is an amylase variant of that invention of wild type amylase Bacillus sp722SEQ ID NO1 with the following two deletions D183* + G184* and including W140Y, N195F, V206Y, Y243F and W284D replacements. Also referenced as SP722 + D183* + G184*+ W140Y + N195F + V206Y + Y243F + W284D.II. test fabrics
[000361] Three amylase sensitive spots; Rice Starch CS-28, Rice Starch PCS-28 and Tapioca Starch CS-29, 5 cm x 5 cm (provided by Center For Test materials, Netherlands) were placed in 20 cm x 20 cm white cotton mesh (supplied by Warwick Equest, Durham, UK). Two amylase sensitive spots; BBQ sauce and Frijj chocolate smoothie, 2.5 cm in diameter were placed in 20 cm x 20 cm white cotton mesh (supplied by Warwick Equest, Durham, UK). Eight replicates (2 replicates on 4 different machines) were used for each test formulation.
III. test wash procedure
[000362] The method involves the use of Hotpoint washing machines used in Western Europe, model Aquarius WF541. Test formulations as described above were used to wash amylase sensitive stains with addition of mixed soil and clean ballast load as described above.
[000363] Washing machines containing 6 g/L of test formulation, 13 L of water at 10°clark hardness, plus test fabrics and ballast were washed at 15°C in a rapid cotton wash cycle for 1 hour and 15 minutes. After washing, the test fabrics were dried vertically on the inside.
[000364] The washing process was repeated for three more cycles.
[000365] The Stain Removal Index (SRI) (as measured by comparing unwashed to washed L* a* b* values) was then measured in order to quantify the stain removal performance of the detergent compositions.
[000366] The performance index was also measured by calculating (Example C or Example D performance minus Comparative Example A performance) divided by (Comparative Example B performance minus Comparative Example A performance) multiplied by 100.IV. Comparison of samples. Table 6: Average SRI in 5 spots (8 replicates of each spot)

[000367] Comparing the washed samples with the composition of example A (zero enzymes present) with example B (containing Natalase), C and D (containing variants 1 and 2, respectively), it is visible that the stain removal performance it is improved by the addition of an amylase enzyme.
[000368] Comparing the samples washed with the composition of example B (containing Natalase) with examples C and D (containing variants 1 and 2, respectively) according to example A as the reference (zero enzymes), it is visible that both variants 1 and 2 of the invention are able to achieve significantly higher levels of stain removal than Natalase®.Example 3 Large scale evaluation of amylase variants in washing machine liquid detergent performance.I. Preparation of detergent test compositions
[000369] In that experiment, four test compositions were prepared based on the liquid detergent of example 1B above. A detergent base was prepared from example 1B, containing no enzymes and finished to pH 8.2.
[000370]
[000371] The following four formulations were prepared:
*Added as active enzyme protein1Natalase® is supplied by Novozymes A/S, Bagsvaerd, Denmark as 'Natalase 200L'.4 Variant 3 is an amylase variant of this invention of wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183 * + G184* and including W140Y, N195F, V206Y, Y243F, E260G and G477E replacements. Also referenced as SP722 + D183* + G184* + W140Y + N195F + V206Y + Y243F + E260G + G477E5 Variant 4 is an amylase variant of that invention of wild type amylase Bacillus sp722 SEQ ID NO:1 with the following two deletions D183* + G184* and including G109A, W140Y, N195F, V206Y, Y243F and E260G substitutions. Also referenced as SP722 + D183* + G184* + G109A + W140Y + N195F + V206Y + Y243F + E260G.II. test fabrics
[000372] Three amylase sensitive spots; Rice Starch PCS-28, Rice Starch PS-28 and Corn Starch CS-26, 5 cm x 5 cm (supplied by Center For Test materials, The Netherlands) were placed in 20 cm x 20 cm white cotton mesh ( provided by Warwick Equest, Durham, UK). Two amylase sensitive spots; BBQ sauce and chocolate baby pudding, 2.5 cm in diameter were placed on 20 cm x 20 cm white cotton mesh (supplied by Warwick Equest, Durham, UK). Eight replicates (2 replicates on 4 different machines) were used for each test formulation.
III. test wash procedure
[000373] The method involves the use of a North American Kenmore washing machine, 600 series. Test formulations as described above were used to wash amylase sensitive stains with addition of mixed soil and clean ballast load as described above.
[000374] Washing machines containing 0.78 g/L of test formulation, 64 L of water 6°clark water hardness, plus test fabrics and ballast were washed at 15°C in a 12-minute superwash with a rinse. After washing, the test fabrics were dried vertically on the inside.
[000375] The washing process was repeated for three more cycles.
The stain removal index (as measured by comparing unwashed to washed L* a* b* values) was then measured in order to quantify the stain removal performance of the detergent compositions.
[000377] The performance index was also measured by calculating (Example C or Example D performance minus Comparative Example A performance) divided by (Comparative Example B performance minus Comparative Example A performance) multiplied by 100.IV. Comparison of samples. Table 10: Average SRI in 5 spots (8 replicates of each spot)

[000378] Comparing the samples washed with the composition of example A (zero enzymes present) with example B (containing Natalase), C and D (containing variants 3 and 4, respectively), it is visible that the stain removal performance it is improved by the addition of an amylase enzyme.
[000379] Comparing the samples washed with the composition of example B (containing Natalase) with examples C and D (containing variants 3 and 4, respectively) according to example A as the reference (zero enzymes), it is visible that both variants 3 and 4 of the invention can achieve significantly higher levels of stain removal than Natalase®. Example 4 Large scale performance evaluation of amylase variants in washing machine liquid detergent. Preparation of detergent test compositions
[000380] In that experiment, four test compositions were prepared based on the liquid detergent of formulation 4A below. A detergent base was prepared from formulation 4A, containing no enzymes and finished to pH 8.2. Table 12; Formulation 4A: Heavy duty liquid laundry detergent composition
1Random graft copolymer is a polyvinyl acetate grafted polyethylene oxide copolymer with a polyethylene oxide backbone and multiple polyvinyl acetate side chains. The molecular weight of the polyethylene oxide backbone is about 6000 and the weight ratio of polyethylene oxide to polyvinyl acetate is about 40 to 60 and no more than 1 graft point per 50 ethylene oxide units.
[000381] The following seven detergent formulations were prepared:
*Added as active enzyme protein1Natalase® is an amylase enzyme supplied by Novozymes A/S, Bagsvaerd, Denmark as 'Natalase 200L'.2 Variant 5 is an amylase variant of this invention of wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including substitutions G109A, W140Y, N195F, V206Y, Y243F, E260G and G476E. Also referenced as SP722 + D183* + G184* + G109A + W140Y + N195F + V206Y + Y243F + E260G + G476E.3 Variant 6 is an amylase variant of this invention of wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including T51I, G109A, W140Y, N195F, V206Y, Y243F, E260G and W439R substitutions. Also referenced as SP722 + D183* + G184* + T51I + G109A + W140Y + N195F + V206Y + Y243F + E260G + W439R.4 Variant 7 is an amylase variant of that invention of the wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including T51I, S52Q, N54K, G109A, W140Y, N195F, V206Y, Y243F, E260G and G476E substitutions. Also referenced as SP722 + D183* + G184* + T51I + S52Q + N54K + G109A + W140Y + N195F + V206Y + Y243F + E260G + G476E.5 Variant 8 is an amylase variant of this invention of the wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including the substitutions W140Y, N195F, V206Y, Y243F, E260G, G304R and G476K. Also referenced as SP722 + D183* + G184* + W140Y + N195F + V206Y + Y243F + E260G + G304R + G476K.6 Variant 9 is an amylase variant of that invention of wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including W140Y, N195F, V206Y, Y243F, E260G, W284R and G477K substitutions. Also referenced as SP722 + D183* + G184* + W140Y + N195F + V206Y + Y243F + E260G + W284R + G477K.II. test fabrics
[000382] Three amylase sensitive spots; Rice Starch PCS-28, Aged Rice Starch CS-128 and Corn Starch CS-26, 5 cm x 5 cm (supplied by Center For Test materials, Netherlands) were placed on 20 cm x 20 cm white cotton mesh (provided by Warwick Equest, Durham, UK). Two amylase sensitive spots; chili with meat and Heinz spaghetti, 2.5 cm in diameter were placed in 20 cm x 20 cm white cotton mesh (supplied by Warwick Equest, Durham, UK). Eight replicates (2 replicates on 4 different machines) were used for each test formulation.
III. test wash procedure
[000383] The method involves the use of Hotpoint washing machines used in Western Europe, model Aquarius WF541. Test formulations as described above were used to wash amylase sensitive stains with addition of mixed soil and clean ballast load as described above.
[000384] Washing machines containing 6 g/L of test formulation, 13 L of water at 10°clark hardness, plus test fabrics and ballast were washed at 15°C in a rapid cotton wash cycle for 1 hour and 15 minutes. After washing, the test fabrics were dried vertically on the inside.
[000385] The washing process was repeated for three more cycles.
[000386] The Stain Removal Index (SRI) (as measured by comparing unwashed to washed L* a* b* values) was then measured in order to quantify the stain removal performance of the detergent compositions.
[000387] The performance index was also measured by calculating (Example C, D, E, F or G performance minus comparative example A performance) divided by (comparative example B performance minus comparative example A performance) multiplied by 100.IV. Comparison of samples. Table 15: Average SRI in 5 spots (8 replicates of each spot)


[000388] Comparing the samples washed with the composition of example A (zero enzymes present) with example B (containing Natalase), C, D, E, F, and G (containing variants 5, 6, 7, 8 and 9, respectively), it is apparent that the stain removal performance is improved by the addition of an amylase enzyme.
[000389] Comparing the washed samples with the composition of example B (containing Natalase) with examples C, D, E, F and G (containing variants 5, 6, 7, 8 and 9, respectively) according to example As the reference (zero enzymes), it is apparent that variants 5, 6, 7, 8 and 9 of the invention can achieve significantly higher levels of stain removal than Natalase®. amylase in liquid detergent in a washing machine.I. Preparation of detergent test compositions
[000390] In this experiment, four test compositions were prepared based on the 5A liquid detergent formulation. A detergent base was prepared from formulation 5A, containing no enzymes and finished to pH 8.2. Table 17: Composition of Heavy Duty Liquid Laundry Detergent Formulation 5A
2 Polyethylenimine (MW = 600) with 20 groups ethoxylated by -NH.3 Amphiphilic alkoxylated polymer is a polyethylenimine (MW 600) prepared from a polymer that is derivatized to contain 24 groups ethoxylated by -NH and 16 groups propoxylated by -NH .
The following six formulations were prepared: * Added as active enzyme protein1 Natalase® is supplied by Novozymes A/S, Bagsvaerd, Denmark as 'Natalase 200L'.2 Variant 7 is an amylase variant of this invention of wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including the substitutions T51I, S52Q, N54K, G109A, W140Y, N195F, V206Y, Y243F, E260G and G476E. Also referenced as SP722 + D183* + G184* + T51I + S52Q + N54K + G109A + W140Y + N195F + V206Y + Y243F + E260G + G476E.3 Variant 8 is an amylase variant of this invention of the wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including the substitutions W140Y, N195F, V206Y, Y243F, E260G, G304R and G476K. Also referenced as SP722 + D183* + G184* + W140Y + N195F + V206Y + Y243F + E260G + G304R + G476K.4 Variant 9 is an amylase variant of that invention of wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including W140Y, N195F, V206Y, Y243F, E260G, W284R and G477K substitutions. Also referenced as SP722 + D183* + G184* + W140Y + N195F + V206Y + Y243F + E260G + W284R + G477K.5 Variant 10 is an amylase variant of this invention of wild type amylase Bacillus sp722 SEQ ID NO1 with the following two deletions D183* + G184* and including the W140Y, N195F, V206Y, Y243F, E260G, W284F and G477R. Also referenced as SP722 + D183* + G184* + W140Y + N195F + V206Y + Y243F + E260G + W284F + G477R.II. test fabrics
[000391] Three amylase sensitive spots; Rice Starch PCS-28, Rice Starch PS-28 and Tapioca Starch CS-29, 5 cm x 5 cm (supplied by Center For Test materials, Netherlands) were placed in 20 cm x 20 cm white cotton mesh ( provided by Warwick Equest, Durham, UK). An amylase sensitive spot; Heinz spaghetti, 2.5 cm in diameter was placed on 20 cm x 20 cm white cotton mesh (supplied by Warwick Equest, Durham, UK). An amylase sensitive spot; dressing, 2.5 cm in diameter was placed in 25 cm x 24 cm white cotton mesh (supplied by Accurate Product Development, Fairfield, Ohio, USA). Eight replicates (2 replicates on 4 different machines) were used for each test formulation.
III. test wash procedure
[000392] The method involves the use of a North American Kenmore washing machine, 600 series. Test formulations as described above were used to wash amylase sensitive stains with the addition of mixed soiling and clean ballast load as described above.
[000393] Washing machines containing 0.78 g/L of test formulation, 64 L of water 6°clark water hardness, plus test fabrics and ballast were washed at 15°C in a 12-minute superwash with a rinse. After washing, the test fabrics were dried vertically on the inside. The washing process was repeated for another three cycles.
The stain removal index (as measured by comparing unwashed to washed L* a* b* values) was then measured in order to quantify the stain removal performance of the detergent compositions.
[000395] The performance index was also measured by calculating (Example C, D, E, or F performance minus Comparative Example A performance) divided by (Comparative Example B performance minus Comparative Example A performance) multiplied by 100. IV. Comparison of samples. Table 20: Average SRI in 5 spots (8 replicates of each spot)

[000396] Comparing the washed samples with the composition of example A (zero enzymes present) with example B (containing Natalase), C, D, E and F (containing variants 7, 8, 9 and 10, respectively), is It is apparent that the stain removal performance is improved by the addition of an amylase enzyme.
[000397] Comparing the washed samples with the composition of example B (containing Natalase) with examples C, D, E and F (containing variants 7, 8, 9 and 10, respectively) according to example A as the reference (zero enzymes), it is apparent that variants 7, 8, 9 and 10 of the invention can achieve significantly higher levels of stain removal than Natalase®.
[000398] The invention described and claimed herein should not be limited in scope by the specific aspects disclosed herein, as these aspects are intended to illustrate various aspects of the invention. Any equivalent aspects are within the scope of this invention. Indeed, various modifications of the invention, in addition to those presented and described herein, will be clear to practitioners from the foregoing description. These modifications are also intended to fall within the scope of the accompanying claims. In case of conflict, the present disclosure including definitions will prevail.

权利要求:
Claims (2)
[0001]
1. Isolated variant of a parent alpha-amylase, characterized in that it comprises substitutions at positions corresponding to positions of the mature polypeptide of SEQ ID NO: 1, selected from the group consisting of: W140Y + N195F + V206Y + Y243F, N195F + V206Y + Y243F + W284D,W140F + R181H,N195F + V206Y + E260R + G273D,N195F + V206Y + Y243F + E260K + G273D,D134E + G476E,K72R + N195F + V206Y + Y243F + E260H + G273V,N195F + Y273V,N195F + G273V,W140Y + N195F + V206Y + Y243F + E260G,N195F + V206Y + Y243F + E260K + W284D,W140Y + N195F + V206Y + Y243F + E260G + W284D,W140Y + N195F + V206Y + Y243F + W284D, W140Y + N195F + V206Y + Y243F + E260G + W284D,W140Y + N195F + V206Y + Y243F + E260TW + E260TW V206Y + Y243F,W140Y + N195F + V206Y + Y243F + W284D,N195F + V206Y + Y243F + G477R,N195F + V206Y + Y243F + G477M,W140Y + W189G + N195F + V206Y + Y243F + EY260G,F140Y + Y243F + E260G,F140Y E260G + G477E, W140Y + N195F + V206Y + Y243F + E260G + G476E, W140Y + N195F + V206Y + Y243F + E260G + S303G, W140Y + W189T + N195F + V206Y + Y243F + E260G, W140Y + N195F + V206Y + Y243F + E260G + G337N,Y100I + W140Y + N195F + V206Y + Y243F + E260G,G109A + W140Y + N195F + V206Y + Y243F + E260G, W140Y + N195F + V206Y + Y243F + E260GY + W09439R,G N195F + V206Y + Y243F + E260G,G109A + W140Y + N195F + V206Y + Y243F + E260G + G476E,T51I + Y100I + G109A + W140Y + N195F + V206Y + Y243F + E260G, T51I + G109F + W140Y + N109F + G109F + W140Y E260G + W439R, T51I + S52Q + N54K + G109A + W140Y + N195F + V206Y + Y243F + E260G + G476E, W140Y + N195F + V206Y + Y243F + E260G + G304R + G476K, W140Y + N195F + W V206E + 243 G477K,W140Y + N195F + V206Y + Y243F + E260G + W284F + G477R,N195F + V206Y + Y243F + E260G + W284D,N195F + V206Y + Y243F + S473T + G476R, eN195F + V206Y + Y243F in which variant has G alpha-amylase activity.
[0002]
2. Variant according to claim 1, characterized in that it further comprises eliminations in positions corresponding to positions G182* + D183* or D183* + G184* of SEQ ID NO:1.

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法律状态:
2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-07-09| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|

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2020-06-09| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2021-02-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-06-01| B09W| Correction of the decision to grant [chapter 9.1.4 patent gazette]|Free format text: RETIFICACAO DA PUBLICACAO DEVIDO A INCORRECOES NO QUADRO 1 DO PARECER DE DEFERIMENTO. |

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2021-06-15| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 29/06/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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EP11172251|2011-06-30|

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EP11172251.8|2011-06-30|

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PCT/EP2012/062748|WO2013001078A1|2011-06-30|2012-06-29|Alpha-amylase variants|

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