EP3464577A1

EP3464577A1 - Novel amylases

Info

Publication number: EP3464577A1
Application number: EP17728806.5A
Authority: EP
Inventors: Daniela HERBST; Nina Mussmann; Timothy O'connell; Claudia LINDNER; Anna Krüger; Neele Meyer; Garabed Antranikian; Anke Peters
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 2016-06-06
Filing date: 2017-06-01
Publication date: 2019-04-10
Also published as: DE102016209880A1; US10662399B2; WO2017211678A1; US20190153357A1

Abstract

The invention relates to amylases which have an amino acid sequence that, over its entire length, shares at least 70% sequence identity with the amino acid sequence of SEQ ID NO. 1, and to the production and use thereof. Said type of amylases have a good cleaning performance.

Description

"New Amylases"

The invention is in the field of enzyme technology. More particularly, the invention relates to amylases and their preparation whose amino acid sequence, which can be used in particular with regard to the use in detergents and cleaners, all sufficiently similar amylases with a correspondingly similar sequence according to SEQ ID NO: 1 and encoding them nucleic acids. The invention further relates to methods and uses of these amylases and agents containing them, in particular washing and cleaning agents.

Alpha-amylases are among the most technically important enzymes. Their use for detergents and cleaners is established industrially and they can be contained in modern, powerful detergents and cleaners. An alpha-amylase is an enzyme that catalyzes the hydrolysis of the internal a (1-4) glycoside bonds of amylose but not the cleavage of terminal or a (1-6) -glycoside bonds. Alpha-amylases are therefore a group of esterases (E.C. 3.2.1.1.). Alpha-amylases catalyze the cleavage of starch, glycogen, and other oligo- and polysaccharides that have a (1-4) -glycoside linkage. In this respect, alpha-amylases counteract starch residues in the laundry and catalyze their hydrolysis (endohydrolysis). Alpha-amylases with broad substrate spectra are used in particular where inhomogeneous raw materials or substrate mixtures have to be reacted, that is, for example, in detergents and cleaning agents, since contaminants can consist of differently structured starch molecules and oligosaccharides. The alpha-amylases used in the washing or cleaning agents known from the prior art are usually of microbial origin and are generally derived from bacteria or fungi, for example the genera Bacillus, Pseudomonas, Acinetobacter, Micrococcus, Humicola, Trichoderma or Trichosporon. Alpha-amylases are usually produced by biotechnological methods known per se by suitable microorganisms, for example by transgenic expression hosts of the genera Bacillus or by filamentous fungi.

A particularly extensively characterized alpha-amylase is one from the alkalophilic Bacillus sp. Strain TS-23, which hydrolyzes at least five types of starch (Lin et al., Biotechnol Appl Biochem, 28: 61-68, 1998). The alpha-amylase from Bacillus sp. Strain TS-23 has a pH optimum of 9, although it is stable over a broad pH range (ie, pH 4.7 to 10.8). Its optimum temperature is 45 ° C, the enzyme also having activity at lower temperatures, for example 15-20 ° C. Also, the US patent applications US 7407677 B2 and US 8852912 B2 disclose specific alpha-amylases and their fragments for use in washing u. Detergents.

Nonetheless, there is a need for (alpha) -amylase variants which have altered biochemical properties and thereby provide improved performance in industrial applications.

Surprisingly, it has now been found that an enzyme annotated as alpha-amylase or a sufficiently similar amylase (based on the sequence identity), is particularly suitable for use in detergents or cleaners because it has a broad spectrum of starch substrates under standard conditions. Washing conditions hydrolyzed.

The invention therefore in a first aspect is an amylase comprising an amino acid sequence which has at least 70% sequence identity with the amino acid sequence given in SEQ ID NO: 1 over its entire length.

Another object of the invention is a method for producing an amylase comprising providing a Ausgangssamylase having at least 70% sequence identity to the amino acid sequence shown in SEQ ID NO: 1 over the entire length thereof.

An amylase within the meaning of the present patent application therefore comprises both the amylase as such and an amylase prepared by a process according to the invention. All statements on the amylase therefore relate both to the amylase as a substance and to the corresponding processes, in particular the preparation process of the amylase, and the amylases prepared therewith.

Other subjects of the invention are the nucleic acids encoding the amylases according to the invention, amylases or nucleic acids according to the invention which encode them containing non-human host cells and agents comprising amylases according to the invention, in particular detergents and cleaners, washing and cleaning processes in which the amylases according to the invention are used, and uses of the invention Amylases according to the invention. A nucleotide sequence encoding the amino acid sequence according to SEQ ID NO: 1 is given in SEQ ID NO: 2.

The present invention is based on the surprising discovery that an amylase according to the invention comprising at least 70% of the amino acid sequence given in SEQ ID NO: 1 causes the hydrolysis of a broad spectrum of starch substrates under standard washing conditions. This is especially surprising in this respect. seeing, as yet no amylases with comparable sequence homology for use in detergents have been described.

The amylases according to the invention have a high stability in detergents or cleaners, for example with respect to surfactants and / or bleaches and / or to temperature influences, and / or acidic or alkaline conditions and / or to pH changes and / or to denaturing or oxidizing agents and / or against proteolytic degradation and / or against a change in the redox ratios. In particularly preferred embodiments of the invention, performance-enhanced amylase variants are thus provided. Such advantageous embodiments of amylases according to the invention consequently enable improved wash results on starch-containing stains in a wide temperature range.

An amylase according to the invention has an enzymatic activity, that is to say it is capable of hydrolysing starch and oligosaccharides, in particular in a washing or cleaning agent. An alpha-amylase according to the invention is therefore an enzyme which catalyzes the hydrolysis of a (1-4) -glycoside bonds in glycoside substrates and thereby is able to cleave starch or oligosaccharides. Further, an amylase of the invention is preferably a mature alpha-amylase, i. to the catalytically active molecule without signal and / or propeptide (s). Unless otherwise stated, the sequences given refer to each mature (processed) enzymes.

In various embodiments of the invention, the amylase comprises an amino acid sequence which corresponds to the amino acid sequence given in SEQ ID NO: 1 over its total length to at least 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%. , 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 90.5%, 91%, 91, 5%, 92%, 92.5%, 93%, 93.5%, 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5% , 98%, 98.5%, 98.8%, 99.0%, 99.2%, 99.4%, 99.6% or 99.8%.

In other various embodiments of the invention, the amylase is a free enzyme. This means that the amylase can interact directly with all components of an agent and, if the agent is a liquid agent, that the amylase is in direct contact with the solvent of the agent of the invention (eg water). In other embodiments, the amylase of the invention may form in one agent a complex with other molecules or comprise an "envelope." Here, a single or multiple amylase molecules may be separated from the other constituents of an agent by a surrounding structure Such a separating structure includes, but is not limited to, vesicles such as a micelle or a liposome, but the surrounding structure may also be a virus particle, a bacterial cell or a eukaryotic cell In embodiments, the amylase of the invention may be contained in Bacillus cells expressing this amylase or in cell culture supernatants of such cells.

The identity of nucleic acid or amino acid sequences is determined by a sequence comparison. This sequence comparison is based on the BLAST algorithm established and commonly used in the prior art (see, for example, Altschul, SF, Gish, W., Miller, W., Myers, EW & Lipman, DJ. (1990) "Basic local alignment search Biol. 215: 403-410; and Altschul, Stephan F., Thomas L. Madden, Alejandro A. Schaffer, Jinghui Zhang, Hheng Zhang, Webb Miller, and David J. Lipman (1997): "Gapped BLAST and PSI-BLAST: a new generation of protein database search programs"; Nucleic Acids Res., 25, pp.3389-3402) and is in principle effected by similar sequences of nucleotides or amino acids in the nucleic acid or nucleic acid sequences Amino acid sequences are assigned to each other. A tabular assignment of the respective positions is referred to as alignment. Another algorithm available in the prior art is the FASTA algorithm. Sequence comparisons (alignments), in particular multiple sequence comparisons, are created with computer programs. For example, the Clustal series (see, for example, Chenna et al., 2003: Multiple sequence alignment with the Clustal series of programs, Nucleic Acid Research 31, 3497-3500), T-Coffee (see, for example, Notredame et al (2000): T-Coffee: A novel method for multiple sequence alignments, J. Mol. Biol. 302, 205-217) or programs based on these programs or algorithms. Also possible are alignment comparisons (alignments) with the computer program Vector NTI® Suite 10.3 (Invitrogen Corporation, 1600 Faraday Avenue, Carlsbad, California, USA) with the default parameters, whose AlignX module for sequence comparisons is based on ClustalW.

Such a comparison also allows a statement about the similarity of the compared sequences to each other. It is usually given in percent identity, that is, the proportion of identical nucleotides or amino acid residues at the same or in an alignment corresponding positions. The broader concept of homology involves conserved amino acid substitutions in the consideration of amino acid sequences, that is, amino acids with similar chemical activity, as these usually perform similar chemical activities within the protein. Therefore, the similarity of the sequences compared may also be stated as percent homology or percent similarity. Identity and / or homology information can be made about whole polypeptides or genes or only over individual regions. Homologous or identical regions of different nucleic acid or amino acid sequences are therefore defined by matches in the sequences. Such areas often have identical functions. They can be small and comprise only a few nucleotides or amino acids. Often, such small regions exert essential functions for the overall activity of the protein. It may therefore be useful to relate sequence matches only to individual, possibly small areas. Unless otherwise stated, identity or homoge- in the present application, however, the total length of the particular nucleic acid or amino acid sequence indicated.

In the context of the present invention, the indication that an amino acid position of a numerically designated position in SEQ ID NO: 1 corresponds to the corresponding position being assigned to the numerically designated position in SEQ ID NO: 1 in an alignment as defined above.

In a further embodiment of the invention, the amylase is characterized in that its purification performance is not significantly reduced compared to that of an amylase comprising an amino acid sequence corresponding to the amino acid sequences given in SEQ ID NO: 1, i. has at least 70%, 75%, 80%, 85%, 90%, 95% of the reference washing performance. The cleaning performance can be determined in a washing system containing a detergent in a dosage between 4.5 and 7.0 grams per liter of wash liquor and the amylase, wherein the amylases to be compared are used in the same concentration (based on active protein) and the cleaning performance a soiling on cotton is determined by measuring the degree of cleaning of the washed textiles. For example, the washing process may be carried out for 60 minutes at a temperature of 40 ° C and the water has a water hardness between 5 and 25 °, preferably 10 and 20 °, more preferably 13 and 17 ° and further preferably 15.5 and 16.5 ° (German Hardness). The concentration of the amylase in the detergent intended for this washing system is from 0.001-1% by weight, preferably from 0.001-0, 1% by weight, and more preferably from 0.01% to 0.005% by weight, based on active , pure protein.

A preferred liquid detergent for such a washing system is composed as follows (all figures in weight percent): 7% alkylbenzenesulfonic acid, 9% anionic surfactants, 4% C12-C18 Na salts of fatty acids, 7% nonionic surfactants, 0, 7% phosphonates, 3.2% citric acid, 3.0% NaOH, 0.04% antifoam, 5.7% 1, 2-propanediol, 0.1% preservatives, 2% ethanol, 0.2% dye transfer Inhibitor, remainder demineralized water. Preferably, the dosage of the liquid detergent is between 4.5 and 6.0 grams per liter of wash liquor, for example, 4.7, 4.9 or 5.9 grams per liter of wash liquor. Preference is given to washing in a pH range between pH 7.5 and pH 10.5, preferably between pH 7.5 and pH 9.

In the context of the invention, the determination of the cleaning performance at 40 ° C can be carried out using a liquid detergent as indicated above, wherein the washing process is preferably carried out for 60 minutes.

The degree of whiteness, ie the brightening of the stains, as a measure of the cleaning performance is determined by optical measuring methods, preferably photometrically. A suitable device for this purpose is for example the spectrometer Minolta CM508d. Usually, those for the measurement previously calibrated with a white standard, preferably a supplied white standard.

By using the same activity of the respective amylase, it can be ensured that, even if the ratio of active substance to total protein (the values of the specific activity) diverge, the respective enzymatic properties, ie, for example, the cleaning performance of certain soils, are compared. In general, a low specific activity can be compensated by adding a larger amount of protein. Furthermore, the enzymes to be investigated can also be used in the same molar amount or amount by weight if the enzymes to be investigated have a different affinity for the test substrate in an activity test. In this context, the term "equal amount of substance" refers to a molar use of the enzymes to be investigated. "The same amount by weight" refers to a weight-equivalent use of the enzymes to be investigated.

The alpha-amylase activity is determined in a customary manner, preferably by an optical measuring method, preferably a photometric method. The appropriate test involves the alpha-amylase-dependent cleavage of the substrate para-nitrophenyl maltoheptaoside. This is cleaved by the alpha-amylase into para-nitrophenyl oligosaccharide. The para-nitrophenyl oligosaccharide is in turn catalyzed by the enzymes glucoamylase and alpha-glucosidase to glucose and para-nitrophenol. The presence of para-nitrophenol can be measured using a photometer, e.g. of the Tecan Sunrise device and the XFLUOR software, are determined at 405 nm and thus allows a conclusion on the enzymatic activity of alpha-amylase.

The protein concentration can be determined by known methods, for example, the BCA method (bicinchoninic acid, 2,2'-biquinolyl-4,4'-dicarboxylic acid) or the biuret method (AG Gornall, CS Bardawill and MM David, J. Biol. Chem., 177 (1948), pp. 751-766). Determination of the active protein concentration in this regard may be achieved by titration of the active sites using a suitable irreversible inhibitor and determination of residual activity (see M. Bender et al., J. Am. Chem. Soc., 88, 24 (1966), p -5913).

Proteins can be grouped into groups of immunologically related proteins by reaction with an antiserum or antibody. The members of such a group are characterized by having the same antigenic determinant recognized by an antibody. They are therefore structurally so similar to each other that they are recognized by an antiserum or specific antibodies. A further subject of the invention therefore forms amylases, which are characterized in that they have at least one and increasingly preferably two, three or four matching antigenic determinants with an amylase according to the invention. Such amylases are due to their immunological Matches the amylases of the invention structurally so similar that it is assumed that a similar function.

Amylases according to the invention may have further amino acid changes, in particular amino acid substitutions, insertions or deletions, in comparison with the amylase described in SEQ ID NO: 1. Such amylases are, for example, by targeted genetic modification, i. by mutagenesis, further developed and optimized for specific applications or specific properties (for example, in terms of catalytic activity, stability, etc.). Furthermore, nucleic acids according to the invention can be introduced into recombination approaches and thus used to generate completely novel amylases or other polypeptides.

The goal is to introduce into the known molecules targeted mutations such as substitutions, insertions or deletions, for example, to improve the cleaning performance of enzymes of the invention. For this purpose, in particular the surface charges and / or the isoelectric point of the molecules and thereby their interactions with the substrate can be changed. Thus, for example, the net charge of the enzymes can be changed in order to influence the substrate binding, in particular for use in detergents and cleaners. Alternatively or additionally, the stability of the amylase can be increased even further by one or more corresponding mutations, thereby improving its purification performance. Advantageous properties of individual mutations, e.g. individual substitutions can complement each other. An amylase which has already been optimized with regard to certain properties, for example with regard to its activity and / or its tolerance with regard to the substrate spectrum, can therefore be further developed within the scope of the invention.

For the description of substitutions that concern exactly one amino acid position (amino acid substitutions), the following convention is used: first, the naturally occurring amino acid is designated in the form of the international one-letter code, followed by the associated sequence position and finally the inserted amino acid. Several exchanges within the same polypeptide chain are separated by slashes. For insertions, additional amino acids are named after the sequence position. In the case of deletions, the missing amino acid is replaced by a symbol, for example a star or a dash, or a Δ is specified in front of the corresponding position. For example, N25Q describes the substitution of asparagine at position 25 by glutamine, N25AQ the insertion of alanine after the amino acid asparagine at position 25 and N25 ^* or ΔΝ25 the deletion of asparagine at position 25. This nomenclature is known to those skilled in the art of enzyme technology.

Another object of the invention is therefore an amylase which is characterized in that it is obtainable from an amylase as described above as the starting molecule single or multiple conservative amino acid substitution. The term "conservative amino acid substitution" means the substitution of one amino acid residue for another amino acid residue, which substitution does not result in a change in polarity or charge at the position of the exchanged amino acid, e.g. Example, the replacement of a nonpolar amino acid residue against another nonpolar amino acid residue. Conservative amino acid substitutions within the scope of the invention include, for example: G = A = S, l = V = L = M, D = E, N = Q, K = R, Y = F, S = T, G = A = I = V = L = M = Y = F = W = P = S = T.

Alternatively or additionally, the amylase is characterized in that it is obtainable from an amylase according to the invention as the starting molecule by fragmentation, deletion, insertion or substitution mutagenesis and comprises an amino acid sequence which has a length of at least 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530 or 536 contiguous amino acids matches the parent molecule.

Thus, for example, it is possible to delete individual amino acids at the termini or in the loops of the enzyme, without this losing or reducing the endohydrolytic activity. Furthermore, such fragmentation, deletion, insertion or substitution mutagenesis can also reduce, for example, the allergenicity of the enzymes concerned and thus improve their overall applicability. Advantageously, the enzymes retain their endohydrolytic activity even after mutagenesis, i. their endohydrolytic activity is at least equal to that of the starting enzyme, i. in a preferred embodiment, the endohydrolytic activity is at least 80, preferably at least 90% of the activity of the starting enzyme. Other substitutions can also show beneficial effects. Both single and multiple contiguous amino acids can be substituted for other amino acids.

The further amino acid positions are hereby defined by an alignment of the amino acid sequence of an amylase according to the invention with the amino acid sequence of the amylase, as indicated in SEQ ID NO: 1. Furthermore, the assignment of the positions depends on the mature (mature) protein. This assignment is also to be used in particular if the amino acid sequence of an amylase according to the invention comprises a higher number of amino acid residues than the amylase according to SEQ ID NO: 1. Starting from the stated positions in the amino acid sequence of the amylase, the change positions in an amylase according to the invention are those which are just assigned to these positions in an alignment.

Further confirmation of the correct assignment of the amino acids to be changed, ie in particular their functional correspondence, can provide comparative experiments, according to which the two positions assigned to each other on the basis of an alignment are changed in the same way in both amylases compared with each other and if both are observed the enzymatic activity is changed in the same way. For example, if an amino acid exchange in a certain position of the amylase according to SEQ ID NO: 1 accompanied by a change of an enzymatic parameter, for example with the increase of the M value, and a corresponding change of the enzymatic parameter, thus for example also an increase of the M value observed in an amylase variant of the invention whose amino acid substitution has been achieved by the same amino acid introduced, it is to be seen here a confirmation of the correct assignment.

All these facts are also applicable to the process of the invention for the preparation of an amylase. Accordingly, a method according to the invention further comprises one or more of the following method steps: a) introducing a single or multiple conservative amino acid substitution into a parent amylase according to SEQ ID NO: 1; b) alteration of the amino acid sequence by fragmentation, deletion, insertion or substitution mutagenesis such that the amylase comprises an amino acid sequence of at least 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530 or 536 contiguous amino acids matches the parent molecule.

All statements also apply to the inventive method.

In further embodiments of the invention, the amylase or the amylase produced by a process according to the invention is still at least 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80 %, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 90.5%, 91%, 91, 5%, 92%, 92, 5%, 93%, 93.5%, 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5% , 98.8%, 99.0%, 99.2%, 99.4%, 99.6% or 99.8% identical to the amino acid sequence given in SEQ ID NO: 1 over their entire length.

Another object of the invention is a previously described amylase, which is additionally stabilized, in particular by one or more mutations, for example substitutions, or by coupling to a polymer. For an increase in stability during storage and / or during use, for example during the washing process, causes the enzymatic activity to last longer and thus improve the cleaning performance. In principle, all stabilization options described in the prior art and / or appropriate considerations come into consideration. Preference is given to those stabilizations which are achieved by mutations of the enzyme itself, since such stabilizations do not require any further working steps following the recovery of the enzyme. Examples of sequence changes suitable for this purpose are mentioned above. Other suitable sequence changes are known from the prior art.

Options for stabilization include: Protection against the influence of denaturing agents such as surfactants by mutations that cause an alteration of the amino acid sequence on or at the surface of the protein;

Replacing amino acids near the N-terminus with those likely to contact non-covalent interactions with the rest of the molecule, thus contributing to the maintenance of the globular structure.

Preferred embodiments are those in which the enzyme is stabilized in several ways, as several stabilizing mutations act additive or synergistic.

Another object of the invention is an amylase as described above, which is characterized in that it has at least one chemical modification. An amylase with such a change is called a derivative, i. the amylase is derivatized.

For the purposes of the present application, derivatives are understood as meaning those proteins whose pure amino acid chain has been chemically modified. Such derivatizations can be done, for example, in vivo by the host cell expressing the protein. In this regard, couplings of low molecular weight compounds such as lipids or oligosaccharides are particularly noteworthy. However, derivatizations can also be carried out in vitro, for example by the chemical transformation of a side chain of an amino acid or by covalent binding of another compound to the protein. For example, coupling of amines to carboxyl groups of an enzyme to alter the isoelectric point is possible. Such another compound may also be another protein that is bound to a protein of the invention via bifunctional chemical compounds, for example. Similarly, derivatization is to be understood as meaning the covalent binding to a macromolecular carrier, or else a noncovalent inclusion in suitable macromolecular cage structures. Derivatizations may, for example, affect the substrate specificity or binding strength to the substrate or cause a temporary blockage of the enzymatic activity when the coupled substance is an inhibitor. This can be useful, for example, for the period of storage. Such modifications may further affect stability or enzymatic activity. They can also serve to reduce the allergenicity and / or immunogenicity of the protein and thus, for example, increase its skin compatibility. For example, couplings with macromolecular compounds, for example, polyethylene glycol, can improve the protein in terms of stability and / or skin tolerance.

Derivatives of a protein according to the invention can also be understood in the broadest sense to mean preparations of these proteins. Depending on the extraction, processing or preparation, a protein may be associated with various other substances, for example from the culture of the producing microorganisms. A protein may also have been deliberately added to other substances, for example to increase its storage stability. Therefore, according to the invention are also all preparations of a protein according to the invention. This is also independent of whether or not it actually exhibits this enzymatic activity in a particular preparation. Because it may be desired that it has no or only low activity during storage, and unfolds its enzymatic function only at the time of use. This can be controlled, for example, via appropriate accompanying substances. In particular, the joint preparation of amylases with specific inhibitors is possible in this regard.

With regard to all the amylases or amylase variants and / or derivatives described above, particular preference is given in the context of the present invention to those whose catalytic activity and / or their substrate tolerance corresponds to that of the amylase according to SEQ ID NO: 1, wherein the catalytic activity and the substrate tolerance such as be described above.

A further subject of the invention is a nucleic acid which codes for an amylase according to the invention, as well as a vector containing such a nucleic acid, in particular a cloning vector or an expression vector. In preferred embodiments, the nucleic acid is a nucleic acid according to SEQ ID NO: 2. Accordingly, a particularly preferred vector according to the invention is a vector comprising a nucleic acid according to SEQ ID NO: 2.

These may be DNA or RNA molecules. They can be present as a single strand, as a single strand that is complementary to this single strand, or as a double strand. Especially in the case of DNA molecules, the sequences of both complementary strands must be taken into account in all three possible reading frames. Furthermore, it should be noted that different codons, so base triplets, can code for the same amino acids, so that a particular amino acid sequence can be encoded by several different nucleic acids. Due to this degeneracy of the genetic code, all nucleic acid sequences are included in this subject of the invention which can encode any of the above-described amylases. The person skilled in the art is able to determine these nucleic acid sequences unequivocally since, despite the degeneracy of the genetic code, individual codons are assigned defined amino acids. Therefore, the person skilled in the art can easily determine nucleic acids coding for this amino acid sequence on the basis of an amino acid sequence. Furthermore, with nucleic acids according to the invention, one or more codons may be replaced by synonymous codons. This aspect relates in particular to the heterologous expression of the enzymes according to the invention. Thus, each organism, for example a host cell of a production strain, has a particular codon usage. Codon usage is understood to mean the translation of the genetic code into amino acids by the particular organism. Bottlenecks in protein biosynthesis can occur if the codons lying on the nucleic acid in the organism face a comparatively small number of loaded tRNA molecules. Although coding for the same amino acid, this results in a codon being less efficiently translated in the organism than a synonymous codon which is responsible for the same amino acid. Nucleic acid coded. Due to the presence of a higher number of tRNA molecules for the synonymous codon, it can be more efficiently translated in the organism.

A person skilled in the art can use well-known methods such as chemical synthesis or the polymerase chain reaction (PCR) in combination with molecular biological and / or proteinchemical standard methods, using known DNA and / or amino acid sequences, the corresponding nucleic acids to complete genes manufacture. Such methods are for example from Sambrook, J., Fritsch, E.F. and Maniatis, T. 2001. Molecular cloning: a laboratory manual, 3rd Edition Cold Spring Laboratory Press.

For the purposes of the present invention, vectors are understood as consisting of nucleic acids which contain a nucleic acid according to the invention as a characteristic nucleic acid region. They can establish these in a species or cell line over several generations or cell divisions as a stable genetic element. Vectors, especially when used in bacteria, are special plasmids, ie circular genetic elements. In the context of the present invention, a nucleic acid according to the invention is cloned into a vector. The vectors include, for example, those whose origin are bacterial plasmids, viruses or bacteriophages, or predominantly synthetic vectors or plasmids with elements of various origins. With the other genetic elements present in each case, vectors are able to establish themselves as stable units in the relevant host cells over several generations. They may be extrachromosomal as separate units or integrated into a chromosome or chromosomal DNA.

Expression vectors comprise nucleic acid sequences which enable them to replicate in the host cells containing them, preferably microorganisms, particularly preferably bacteria, and to express a contained nucleic acid there. In particular, expression is influenced by the promoter (s) that regulate transcription. In principle, the expression may be effected by the natural promoter originally located in front of the nucleic acid to be expressed, but also by a promoter of the host cell provided on the expression vector or also by a modified or completely different promoter of another organism or another host cell. In the present case, at least one promoter for the expression of a nucleic acid according to the invention is made available and used for its expression. Furthermore, expression vectors can be regulatable, for example by changing the culturing conditions or when a specific cell density of the host cells contained therein is reached or by addition of specific substances, in particular activators of gene expression. An example of such a substance is the galactose derivative isopropyl-β-D-thiogalactopyranoside (IPTG), which is used as activator of the bacterial lactose operon (lac operon). In contrast to expression vectors, the nucleic acid contained is not expressed in cloning vectors. A further subject of the invention is a non-human host cell which contains a nucleic acid according to the invention or a vector according to the invention, or which contains an amylase according to the invention, in particular one which secretes the amylase into the medium surrounding the host cell. Preferably, a nucleic acid according to the invention or a vector according to the invention is transformed into a microorganism, which then represents a host cell according to the invention. Alternatively, individual components, ie nucleic acid parts or fragments of a nucleic acid according to the invention can be introduced into a host cell such that the resulting host cell contains a nucleic acid according to the invention or a vector according to the invention. This procedure is particularly suitable when the host cell already contains one or more constituents of a nucleic acid according to the invention or a vector according to the invention and the further constituents are then supplemented accordingly. Methods of transforming cells are well established in the art and well known to those skilled in the art. In principle, all cells, that is to say prokaryotic or eukaryotic cells, are suitable as host cells. Preference is given to those host cells which can be handled genetically advantageously, for example as regards the transformation with the nucleic acid or the vector and its stable establishment, for example unicellular fungi or bacteria. Furthermore, preferred host cells are characterized by good microbiological and biotechnological handling. This concerns, for example, easy culturing, high growth rates, low demands on fermentation media and good production and secretion rates for foreign proteins. Preferred host cells according to the invention secrete the (transgenially) expressed protein into the medium surrounding the host cells. Furthermore, the amylases can be modified by the producing cells after their production, for example by attachment of sugar molecules, formylations, aminations, etc. Such post-translational modifications can functionally affect the amylase.

Further preferred embodiments are those host cells which are regulatable in their activity due to genetic regulatory elements which are provided, for example, on the vector, but may also be present in these cells from the outset. For example, by controlled addition of chemical compounds that serve as activators, by changing the culture conditions or when reaching a specific cell density, these can be excited for expression. This enables an economical production of the proteins according to the invention. An example of such a compound is IPTG as described above.

Preferred host cells are prokaryotic or bacterial cells. Bacteria are characterized by short generation times and low demands on cultivation conditions. As a result, inexpensive cultivation methods or production methods can be established. In addition, the expert has a wealth of experience in bacteria in fermentation technology. For a specific production, a variety of experiments can be carried out on a case-by-case basis. may be suitable for reasons to be determined, such as nutrient sources, product formation rate, time required, etc., Gram-negative or Gram-positive bacteria.

In Gram-negative bacteria, such as Escherichia coli, a large number of proteins are secreted into the periplasmic space, ie into the compartment between the two membranes enclosing the cells. This can be advantageous for special applications. Furthermore, Gram-negative bacteria can also be designed such that they eject the expressed proteins not only into the periplasmic space but into the medium surrounding the bacterium. In contrast, gram-positive bacteria, such as, for example, Bacilli or Actinomycetes or other representatives of the Actinomycetales, have no outer membrane, so that secreted proteins are readily released into the medium surrounding the bacteria, generally the nutrient medium, from which the expressed proteins can be purified. They can be isolated directly from the medium or further processed. In addition, Gram-positive bacteria are related or identical to most of the organisms of origin for technically important enzymes and usually form even comparable enzymes, so they have a similar codon use and their protein synthesizer is naturally aligned accordingly.

Host cells according to the invention may be altered in their requirements of the culture conditions, have different or additional selection markers or express other or additional proteins. In particular, it may also be those host cells which express several proteins or enzymes transgene.

The present invention is in principle applicable to all microorganisms, in particular all fermentable microorganisms, and leads to the fact that can be produced by the use of such microorganisms proteins of the invention. Such microorganisms then represent host cells in the sense of the invention.

In a further embodiment of the invention, the host cell is characterized in that it is a bacterium, preferably one selected from the genera Escherichia, Klebsiella, Bacillus, Staphylococcus, Corynebacterium, Arthrobacter, Streptomyces, Stenotrophomonas and Pseudomonas, more preferably one selected from the group of Escherichia coli, Klebsiella planticola, Bacillus licheniformis, Bacillus lentus, Bacillus amyloliquefaciens, Bacillus subtilis, Bacillus alcalophilus, Bacillus globigii, Bacillus gibsonii, Bacillus clausa, Bacillus halodurans, Bacillus pumilus, Staphylococcus carnosus, Corynebacterium glutamicum, Arthrobacter oxidans, Streptomyces lividans, Streptomyces coelicolor and Stenotrophomonas malophilia.

The host cell may also be a eukaryotic cell, which is characterized in that it has a cell nucleus. A further subject of the invention therefore represents a host cell, which is characterized in that it has a cell nucleus. In contrast to proka- In ryontal cells, eukaryotic cells are capable of post-translationally modifying the protein formed. Examples thereof are fungi such as Actinomycetes or yeasts such as Saccharomyces or Kluyveromyces. This may be particularly advantageous, for example, if the proteins are to undergo specific modifications in the context of their synthesis that enable such systems. Modifications that eukaryotic systems perform, especially in connection with protein synthesis, include, for example, the binding of low molecular weight compounds such as membrane anchors or oligosaccharides. Such oligosaccharide modifications may be desirable, for example, to lower the allergenicity of an expressed protein. Also, coexpression with the enzymes naturally produced by such cells, such as cellulases, may be advantageous. Furthermore, for example, thermophilic fungal expression systems may be particularly suitable for expressing temperature-resistant proteins or variants. In preferred embodiments of the invention, the host cell is a basidiomycete cell. In further preferred embodiments, the host cell is a Bacillus cell.

The host cells according to the invention are conventionally cultivated and fermented, for example in discontinuous or continuous systems. In the first case, a suitable nutrient medium is inoculated with the host cells and the product is harvested from the medium after an experimentally determined period of time. Continuous fermentations are characterized by achieving a flow equilibrium, in which over a relatively long period of time cells partly die out but also regrow and at the same time the protein formed can be removed from the medium.

Host cells according to the invention are preferably used to produce amylases according to the invention. Another object of the invention is therefore a process for preparing an amylase comprising

a) cultivating a host cell according to the invention, and

b) isolating the amylase from the culture medium or from the host cell.

This subject invention preferably comprises fermentation processes. Fermentation processes are known per se from the prior art and represent the actual large-scale production step, usually followed by a suitable purification method of the product produced, for example the amylase according to the invention. All fermentation processes which are based on a corresponding process for preparing an amylase according to the invention represent embodiments of this subject matter of the invention.

Fermentation processes, which are characterized in that the fermentation is carried out via a feed strategy, come in particular into consideration. Here, the media components consumed by the ongoing cultivation are fed. As a result, considerable increases can be achieved both in the cell density and in the cell mass or dry matter and / or in particular in the activity of the amylase of interest. the. Furthermore, the fermentation can also be designed so that undesired metabolic products are filtered out or neutralized by the addition of buffer or suitable counterions.

The produced amylase can be harvested from the fermentation medium. Such a fermentation process is resistant to isolation of the amylase from the host cell, i. however, requires the provision of suitable host cells or one or more suitable secretion markers or mechanisms and / or transport systems for the host cells to secrete the amylase into the fermentation medium. Alternatively, without secretion, isolation of the amylase from the host cell, i. a purification of the same from the cell mass, carried out, for example by precipitation with ammonium sulfate or ethanol, or by chromatographic purification.

All of the above-described facts can be combined into processes to produce amylases of the invention.

Another object of the invention is an agent which is characterized in that it contains an amylase according to the invention as described above. Preferably, the agent is as a washing or cleaning agent.

This subject matter of the invention includes all conceivable types of detergents or cleaners, both concentrates and undiluted agents, for use on a commercial scale, in the washing machine or in hand washing or cleaning. These include detergents for textiles, carpets, or natural fibers, for which the term detergent is used. These include, for example, dishwashing detergents for dishwashers or manual dishwashing detergents or cleaners for hard surfaces such as metal, glass, porcelain, ceramics, tiles, stone, painted surfaces, plastics, wood or leather, for which the term detergent is used, ie in addition to manual and machine Dishwashing agents, for example, scouring agents, glass cleaners, toilet scenters, etc. The washing and cleaning agents in the invention also include washing aids which are added to the actual detergent in the manual or machine textile laundry to achieve a further effect. Furthermore, laundry detergents and cleaners in the context of the invention also include textile pre-treatment and post-treatment agents, ie those agents with which the laundry item is brought into contact before the actual laundry, for example to dissolve stubborn soiling, and also agents which are in one of the actual Textile laundry downstream step to give the laundry further desirable properties such as comfortable grip, crease resistance or low static charge. Amongst others, the fabric softeners are calculated. The washing or cleaning agents according to the invention, which may be in the form of homogeneous solutions or suspensions in the form of powdered solids, may contain, in addition to an amylase according to the invention, all known ingredients customary in such agents, preferably containing at least one further ingredient in the composition , The agents according to the invention may contain, in particular, surfactants, builders, peroxygen compounds or bleach activators. In addition, they may contain water-miscible organic solvents, further enzymes, sequestering agents, electrolytes, pH regulators and / or further auxiliaries such as optical brighteners, grayness inhibitors, foam regulators, as well as dyes and fragrances, and combinations thereof.

In particular, a combination of an amylase according to the invention with one or more further ingredients of the composition is advantageous, since in preferred embodiments according to the invention such an agent has an improved cleaning performance by virtue of resulting synergisms. In particular, by combining an amylase according to the invention with a surfactant and / or a builder (builder) and / or a peroxygen compound and / or a bleach activator, such a synergism can be achieved.

Advantageous ingredients of agents according to the invention are disclosed in international patent application WO2009 / 121725, starting there on page 5, penultimate paragraph, and ending on page 13 after the second paragraph. This disclosure is incorporated herein by reference and the disclosure is incorporated herein by reference.

An agent according to the invention advantageously contains the amylase in an amount of from 2 μg to 20 mg, preferably from 5 μg to 17.5 mg, more preferably from 2 μg to 15 mg and very particularly preferably from 5 μg to 10 mg per g of the composition. In addition, the agent according to the invention may advantageously contain the amylase in an amount of 0.00005-15% by weight, based on the active enzyme, preferably of 0.0001-5% by weight and more preferably of 0.001-1% by weight. contain. Further, the amylase contained in the agent, and / or other ingredients of the agent, may be enveloped with a substance impermeable to the enzyme at room temperature or in the absence of water, which becomes permeable to the enzyme under conditions of use of the agent. Such an embodiment of the invention is thus characterized in that the amylase is coated with a substance which is impermeable to the amylase at room temperature or in the absence of water. Furthermore, the washing or cleaning agent itself may be packaged in a container, preferably an air-permeable container, from which it is released shortly before use or during the washing process.

In further embodiments of the invention, the agent is characterized in that it

(A) is in solid form, in particular as a free-flowing powder having a bulk density of 300 g / l to 1200 g / l, in particular 500 g / l to 900 g / l, or

(b) is in pasty or liquid form, and / or (c) is in the form of a gel or pouch, and / or

(d) is present as a one-component system, or

(e) is divided into several components.

These embodiments of the present invention include all solid, powdered, liquid, gelatinous or paste-like administration forms of compositions according to the invention, which if appropriate can also consist of several phases and can be present in compressed or uncompressed form. The agent can be present as a free-flowing powder, in particular with a bulk density of 300 g / l to 1200 g / l, in particular 500 g / l to 900 g / l or 600 g / l to 850 g / l. The solid dosage forms of the composition also include extrudates, granules, tablets or pouches. Alternatively, the agent can also be liquid, gelatinous or pasty, for example in the form of a non-aqueous liquid detergent or a non-aqueous paste or in the form of an aqueous liquid detergent or a water-containing paste. Furthermore, the agent may be present as a one-component system. Such funds consist of one phase. Alternatively, an agent can also consist of several phases. Such an agent is therefore divided into several components.

Detergents or cleaning agents according to the invention may contain exclusively an amylase. Alternatively, they may also contain other hydrolytic enzymes or other enzymes in a concentration effective for the effectiveness of the agent. A further embodiment of the invention thus represents agents which further comprise one or more further enzymes. Preferred enzymes which can be used as enzymes are all enzymes which can develop a catalytic activity in the agent according to the invention, in particular a protease, lipase, cellulase, hemicellulase, mannanase, tannase, xylanase, xanthanase, xyloglucanase, β-glucosidase, pectinase, carrageenase, Perhydrolase, oxidase, oxidoreductase or other - distinguishable from the amylases of the invention - amylases, and mixtures thereof. Further enzymes are advantageously contained in the agent in each case in an amount of 1 × 10 ^-8 to 5 percent by weight, based on active protein. More preferably, each further enzyme is in an amount of 1 x 10 ⁷ -3 wt%, from 0.00001 to 1 wt%, from 0.00005 to 0.5 wt%, from 0.0001 to 0, 1 wt .-% and particularly preferably from 0.0001 to 0.05 wt .-% in inventive compositions, based on active protein. Particularly preferably, the enzymes show synergistic cleaning performance against certain stains or stains, ie the enzymes contained in the middle composition mutually support each other in their cleaning performance. Very particular preference is given to such a synergism between the amylase according to the invention and another enzyme of an agent according to the invention, including in particular between said amylase and a lipase and / or a protease and / or a mannanase and / or a cellulase and / or a pectinase , Synergistic effects can occur not only between different enzymes, but also between one or more enzymes and other ingredients of the composition according to the invention. In the cleaning agents described herein, the enzymes to be used may also be formulated together with accompanying substances, for example from the fermentation. In liquid formulations, the enzymes are preferably used as enzyme liquid formulation (s).

The enzymes are usually not provided in the form of the pure protein, but rather in the form of stabilized, storable and transportable preparations. Such prefabricated preparations include, for example, the solid preparations obtained by granulation, extrusion or lyophilization or, especially in the case of liquid or gel-form detergents, solutions of the enzymes, advantageously as concentrated as possible, low in water and / or added with stabilizers or further auxiliaries.

Alternatively, the enzymes may be encapsulated for both the solid and liquid dosage forms, for example by spray-drying or extruding the enzyme solution together with a preferably natural polymer or in the form of capsules, for example those in which the enzymes are entrapped as in a solidified gel or in those of the core-shell type in which an enzyme-containing core is coated with a water, air and / or chemical impermeable protective layer. In deposited layers, further active ingredients, for example stabilizers, emulsifiers, pigments, bleaches or dyes, may additionally be applied. Such capsules are applied by methods known per se, for example by shaking or rolling granulation or in fluid-bed processes. Advantageously, such granules, for example by applying polymeric film-forming agent, low in dust and storage stable due to the coating.

The enzymes can also be incorporated into water-soluble films. Such a film allows the release of the enzymes after contact with water. As used herein, "water-soluble" refers to a film structure that is preferably completely water-soluble, but also films that are substantially water-soluble but have relatively small amounts of a material in the film structure that is not water-soluble; which are water-soluble only at relatively high water temperatures or only under limited pH conditions; and films including a relatively thin layer of water-insoluble material, all included in the term "water-soluble". Preferably, such a film consists of (fully or partially hydrolyzed) polyvinyl alcohol (PVA). However, the film may also contain, exclusively or in addition to the PVA, acid / acrylate copolymers, preferably methacrylic acid / ethyl acrylate copolymer, such as that available from Beiland as GBC 2580 and 2600; Styrene-maleic anhydride copolymer (SMA) (available as Scripset (trade name) from Monsanto); Ethylene-acrylic acid copolymer (EAA) or metal salt neutralized ethylene-methacrylic acid copolymer (EMAA), known as ionomer (available from du Pont), wherein the acid content of EAA or EMAA is at least about 20 mole%; Polyether block amide copolymer; Polyhydroxyvaleric acid (available as Biopol (trade name) resins from Imperial Chemical Industries). ream); polyethylene oxide; water-soluble polyester or copolyester; Polyethyloxazoline (PEOX 200 from Dow); and water-soluble polyurethane.

Furthermore, it is possible to assemble two or more enzymes together so that a single granule has several enzyme activities.

A further subject of the invention is a process for the cleaning of textiles or hard surfaces, which is characterized in that in at least one process step, an inventive agent is applied, or that in at least one process step, an amylase of the invention is catalytically active, in particular such that the amylase in an amount of 40μg to 4g, preferably from 50μg to 3g, more preferably from 100μg to 2g and most preferably from 200μg to 1g is used.

In various embodiments, the method described above is characterized in that the amylase is used at a temperature of 0-100 ^° C, preferably 0-60 ^° C, more preferably 20-45 ^° C and most preferably at 40 ^° C.

These include both manual and mechanical processes, with mechanical processes being preferred. Methods for cleaning textiles are generally distinguished by the fact that various cleaning-active substances are applied to the items to be cleaned and washed off after the contact time, or that the items to be cleaned are otherwise treated with a detergent or a solution or dilution of this product. The same applies to processes for cleaning all other materials than textiles, especially hard surfaces. All conceivable washing or cleaning processes can be enriched in at least one of the process steps by the use of a washing or cleaning agent or an amylase according to the invention and then represent embodiments of the present invention. All facts, objects and embodiments which are essential for amylases according to the invention and those containing them Means are described are also applicable to this subject invention. Therefore, reference is made at this point expressly to the disclosure in the appropriate place with the statement that this disclosure also applies to the above inventive method.

Since amylases according to the invention naturally already have a hydrolytic activity and also unfold them in media which otherwise have no cleaning power, as for example in bare buffer, a single and / or the sole step of such a method can consist in the fact that, if desired, the only cleaning-active component is an inventive Amylase is brought into contact with the soiling, preferably in a buffer solution or in water. This represents a further embodiment of this subject of the invention. Alternative embodiments of this subject matter of the invention are also processes for the treatment of textile raw materials or for textile care, in which an amylase according to the invention becomes active in at least one process step. Among these, methods for textile raw materials, fibers or textiles with natural components are preferred, and especially for those with wool or silk.

All aspects, objects and embodiments described for amylase and agents containing it are also applicable to this subject of the invention. Therefore, reference is made at this point expressly to the disclosure in the appropriate place with the statement that this disclosure also applies to the above inventive use.

In a further aspect, the present invention relates to the use of an amylase according to the invention or an amylase obtainable by a process according to the invention in a washing or cleaning agent for removing starch-containing stains. All aspects, objects and embodiments described for amylase and agents containing it are also applicable to this subject of the invention.

Examples

Example 1 :

Brief summary of the experimental procedure

An activity-based screening of a metagenome database was performed. The metagenome database was created in this case from a biogas reactor sample from Bremen. For the preparation of the metagenome database, the "TOPO XL PCR Cloning Kit" (Invitrogen) was used, whereby a wild-type enzyme according to SEQ ID NO: 1, annotated as alpha-amylase, was discovered The corresponding gene could be isolated, transformed into E. coli and The E. coli produced amylase shows good washing performance on various starchy textiles.

The sequence is far removed from the amylases previously used in L & HC. This opens up many possibilities for increasing genetic diversity and, if necessary, altering the range of services through mutagenesis.

Used detergent matrix

This is the detergent matrix (commercially available, without enzymes, opt. Brightener, perfume and dyes) used for the wash test:

Dosage 4.7 g / L Aktivitätsassav

For the determination of the amylolytic activity of amylases of the invention, a modified para-nitrophenyl maltoheptaoside was used whose terminal glucose unit was blocked by a benzylidene group. From this molecule, the amylase releases para-nitrophenyl oligosaccharide, which in turn is converted to glucose and para-nitrophenol with the aid of the enzymes glucoamylase and alpha-glucosidase. Thus, the amount of released para-nitrophenol is proportional to the activity of the amylase. The measurement is carried out, for example, using the Quick-Start® test kit from Abbott (Abbott Park, Illinois, USA). The increase in absorbance (405 nm) in the test mixture was determined at 37 ° C. for 3 minutes compared with a photometric control value (blank value). Calibration was performed on an enzyme standard of known activity (e.g., Maxamyl® / Purastar® 2900 Genencor 2900 TAU / g). The evaluation was carried out by determining the absorption difference dE (405 nm) per min against the enzyme concentration of the standard.

Washing test and results

A washing test was carried out with the purified supernatant from E. coli containing the wild-type amylase according to the invention according to SEQ ID NO: 1.

Conditions: 40 ° C, 16 ° dH water, 1 h;

Enzyme concentration: 0.186 TAU / ml (determination of amylase activity with benzylidene-blocked para-nitrophenol-maltoheptaoside); this corresponds to an amount of amylase commonly used in detergents.

stains:

1. C-S-26 corn starch

2. C-S-27 potato starch

3. C-S-28 rice starch

4. C-S-29 tapioca starch

5. Wfk 10062 Thickness / Carbon

Prepare excised tissue (diameter = 10 mm) in microtiter plate, preheat the wash liquor to 40 ° C, final concentration 4.7 g / L;

Apply the lye and enzyme to the stain, incubate for 1 h at 40 ° C and 600 rpm; then rinse the soiling several times with clean water, leave to dry and determine the brightness with a colorimeter.

The lighter the tissue, the better the cleaning performance. Measured here is the L value = brightness, the higher the brighter.

It is washed with a common liquid detergent without enzymes. Sample 1: detergent without amylase as benchmark (comparison reference)

Sample 2: detergent plus amylase (according to the invention)

Result (from CL 1 13):

It is clear that the amylase according to the invention performs very well on all five soils. One speaks of a significant performance improvement from 1 unit, here were up to 1 1, 3 units improvement achieved. As a negative control, the boiled, purified supernatant from the production organism E. coli was washed (99 ° C for 30 min), which shows no washing performance (not shown).

Claims

Patent claims

1. Amylase comprising an amino acid sequence that has at least 70% sequence identity with the amino acid sequence specified in SEQ ID NO:1 over its entire length.

2. Amylase, characterized in that

(a) it is obtainable from an amylase according to claim 1 as a starting molecule by single or multiple conservative amino acid substitution; and or

(b) it is obtainable from an amylase according to claim 1 as a starting molecule by fragmentation, deletion, insertion or substitution mutagenesis and comprises an amino acid sequence which has a length of at least 370, 380, 390, 400, 410, 420, 430, 440 , 450, 460, 470, 480, 490, 500, 510, 520, 530 or 536 contiguous amino acids match the starting molecule.

3. A method for producing an amylase according to claim 1 or 2, comprising providing a starting amylase which has at least 70% sequence identity to the amino acid sequence specified in SEQ ID NO: 1 over its entire length.

4. The method according to claim 3, further comprising one or both of the following method steps:

(a) introducing a single or multiple conservative amino acid substitution;

(b) changing the amino acid sequence by fragmentation, deletion, insertion or substitution mutagenesis such that the amylase comprises an amino acid sequence which is at least 370, 380, 390, 400, 410, 420, 430, 440, 450, 460 in length , 470, 480, 490, 500, 510, 520, 530 or 536 contiguous amino acids match the starting molecule.

5. Nucleic acid encoding an amylase according to one of claims 1 or 2 or encoding an amylase obtained by a method of claims 3 or 4.

6. Vector containing a nucleic acid according to claim 5, in particular a cloning vector or an expression vector.

7. Non-human host cell which contains a nucleic acid according to claim 5 or a vector according to claim 6, or which contains an amylase according to one of claims 1 or 2, or which contains an amylase obtained by a method of claims 3 or 4, in particular an , which secretes amylase into the medium surrounding the host cell.

8. Process for producing an amylase comprising a) cultivating a host cell according to claim 7; and

b) Isolating the amylase from the culture medium or from the host cell.

9. Agent, in particular a detergent or cleaning agent, characterized in that it contains at least one amylase according to one of claims 1 or 2 or an amylase obtained by a process of claims 3 or 4, in particular the amylase is in an amount of up to 1 % by weight based on active protein.

10. A method for cleaning textiles or hard surfaces, characterized in that in at least one method step an agent according to claim 9 is used, or that in at least one method step an amylase according to one of claims 1 or 2 or one according to a method of claims 3 or 4 amylase obtained becomes catalytically active.

1 1. Use of an amylase according to one of claims 1 or 2 or an amylase obtainable by a process of claims 3 or 4 in a washing or cleaning agent for removing starch-containing soiling.