Title of Invention: Novel Serine Protease Variant
technical field
[One]
This application relates to novel serine protease variants.
[2]
background
[3]
Protease has various functions such as digestion, absorption, and defense in the living body, and depending on the structure of the active site, serine protease, cysteine ​​protease, and aspartate proteolysis It is divided into an enzyme (aspartic protease) and a metalloprotease (metalloprotease). Among them, serine protease (or serine endopeptidase) is an enzyme that mainly has an active serine residue at the active site in common, and serine acts as a nucleophilic amino acid at the active site of the protease to cleave a peptide bond in a protein (Hedstrom) , 2002. Chem Rev 102: 4501-4524).
[4]
Serine protease has a variety of uses, so it is not only used as an ingredient in detergents for clothing and contact lens cleaners, in addition to treating human diseases such as dissolution of blood clots, but also as a component of milk protein, silk degumming, and leather. It is variously used for soaking, hair removal, oligopeptide synthesis and recovery of silver from waste Xray films, and for the production and improvement of feed and food (Korean Patent Application Laid-Open No. 10-2005-0068750). However, there is a need for an improved serine protease in terms of thermal stability, activity, etc. in order to secure superior industrial economic efficiency and efficacy.
[5]
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[6]
The present inventors have completed the present application by developing a novel variant of a serine protease derived from Thermobifida fusca and confirming that the activity is significantly superior to that of the existing serine protease.
[7]
means of solving the problem
[8]
It is an object of the present application to provide serine protease variants.
[9]
Another object of the present application is to provide a polynucleotide encoding the serine protease variant and a vector comprising the same.
[10]
Another object of the present application is to provide a microorganism expressing the serine protease variant.
[11]
Another object of the present application is the serine protease variant; And it is to provide a composition for feed, comprising one or more of the microorganisms expressing the same.
[12]
Effects of the Invention
[13]
The serine protease variant of the present application has superior activity compared to the existing serine protease, and has high temperature activity and heat resistance, so it can be usefully used industrially.
[14]
Brief description of the drawing
[15]
The serine protease variant of the present application has superior activity compared to the existing serine protease, and has high temperature activity and heat resistance, so it can be usefully used industrially.
[16]
Best mode for carrying out the invention
[17]
This will be described in detail as follows. Meanwhile, each description and embodiment disclosed in the present application may be applied to each other description and embodiment. That is, all combinations of the various elements disclosed in this application fall within the scope of this application. In addition, it cannot be seen that the scope of the present application is limited by the detailed description described below.
[18]
In addition, those skilled in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the present application described herein. Also, such equivalents are intended to be covered by this application.
[19]
[20]
One aspect of the present application provides a serine protease variant.
[21]
As used herein, the term “serine protease” refers to an enzyme belonging to a subgroup of proteases and having proteolytic activity. Specifically, the serine protease may be an enzyme that degrades proteins by hydrolyzing peptide bonds and basically has an active serine residue at the active site, more specifically histidine, an amino acid residue that can be referred to as a three-functional catalytic triad , an enzyme having a spatial arrangement of aspartate and serine.
[22]
The serine protease of the present application may be derived from a microorganism of the genus Thermobifida. Specifically, the wild type of the serine protease in the present application may be a serine protease derived from Thermobifida fusca , specifically, an amino acid sequence derived from SEQ ID NO: 40, and an amino acid derived from SEQ ID NO: 2 sequence, and more specifically, it may be a polypeptide comprising the amino acid sequence set forth in SEQ ID NO: 31, but is not limited thereto. The amino acid sequence of SEQ ID NO: 2, 31 or 40 can be obtained from GenBank of NCBI, a known database.
[23]
The serine protease of the present application may include, without limitation, a sequence having the same activity as the amino acid sequence. In addition, it may include the amino acid sequence of SEQ ID NO: 31 or an amino acid sequence having at least 80% homology or identity therewith, but is not limited thereto. Specifically, the amino acid is an amino acid set forth in SEQ ID NO: 31 or at least 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98 %, or amino acids having at least 99% homology or identity. In addition, it is obvious that proteins having amino acid sequences in which some sequences are deleted, modified, substituted or added are also included within the scope of the present application as long as the amino acid sequence has such homology or identity and exhibits efficacy corresponding to the protein.
[24]
That is, even if it is described as 'a protein or polypeptide having an amino acid sequence set forth in a specific SEQ ID NO:' or 'a protein or polypeptide comprising an amino acid sequence set forth in a specific SEQ ID NO:' in the present application, a polypeptide consisting of the amino acid sequence of the corresponding SEQ ID NO: It is apparent that a protein having an amino acid sequence in which some sequences have been deleted, modified, substituted or added may also be used in the present application, provided that it has the same or corresponding activity to . For example, it is apparent that a 'polypeptide comprising the amino acid sequence of SEQ ID NO: 31' may belong to a 'polypeptide comprising the amino acid sequence of SEQ ID NO: 31' if it has the same or corresponding activity.
[25]
[26]
In the present application, the term 'homology' or 'identity' refers to a degree related to two given amino acid sequences or base sequences, and may be expressed as a percentage. The terms homology and identity can often be used interchangeably.
[27]
Sequence homology or identity of a conserved polynucleotide or polypeptide is determined by standard alignment algorithms, with default gap penalties established by the program used may be used. Substantially, homologous or identical sequences generally have moderate or high stringency conditions along at least about 50%, 60%, 70%, 80% or 90% of the entire or full-length sequence. It can hybridize under stringent conditions. Hybridization is also contemplated for polynucleotides containing degenerate codons instead of codons in the polynucleotides.
[28]
Whether any two polynucleotide or polypeptide sequences have homology, similarity or identity can be determined, for example, by Pearson et al (1988) [Proc. Natl. Acad. Sci. USA 85]: 2444, using a known computer algorithm such as the "FASTA" program. or, as performed in the Needleman program (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al., 2000, Trends Genet. 16: 276-277) (version 5.0.0 or later) of the EMBOSS package, The Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, J. Mol. Biol. 48: 443-453) can be used to determine. (GCG program package (Devereux, J., et al, Nucleic Acids Research 12: 387 (1984)), BLASTP, BLASTN, FASTA (Atschul, [S.] [F.,] [ET AL, J MOLEC BIOL 215]) : 403 (1990); Guide to Huge Computers, Martin J. Bishop, [ED.,] Academic Press, San Diego, 1994, and [CARILLO ETA/.] (1988) SIAM J Applied Math 48: 1073) For example, BLAST of the National Center for Biotechnology Information Database, or ClustalW, can be used to determine homology, similarity or identity.
[29]
Homology, similarity or identity of polynucleotides or polypeptides is described, for example, in Smith and Waterman, Adv. Appl. Math (1981) 2:482, see, for example, Needleman et al. (1970), J Mol Biol. 48: 443 by comparing the sequence information using a GAP computer program. In summary, the GAP program is defined as the total number of symbols in the shorter of two sequences divided by the number of similarly aligned symbols (ie, nucleotides or amino acids). Default parameters for the GAP program are: (1) a binary comparison matrix (containing values ​​of 1 for identity and 0 for non-identity) and Schwartz and Dayhoff, eds., Atlas Of Protein Sequence And Structure, National Biomedical Research Foundation , pp. 353-358 (1979), Gribskov et al (1986) Nucl. Acids Res. 14: weighted comparison matrix of 6745 (or EDNAFULL (EMBOSS version of NCBI NUC4.4) substitution matrix); (2) a penalty of 3.0 for each gap and an additional 0.10 penalty for each symbol in each gap (or a gap open penalty of 10, a gap extension penalty of 0.5); and (3) no penalty for end gaps.
[30]
In addition, whether any two polynucleotide or polypeptide sequences have homology, similarity, or identity can be confirmed by comparing the sequences by Southern hybridization experiments under defined stringent conditions, and the defined appropriate hybridization conditions are within the scope of the art. , can be determined by methods well known to those skilled in the art.
[31]
[32]
The serine protease variant provided in the present application may refer to a variant in which an amino acid at a specific position is substituted among proteins having serine protease activity described above, so that the enzymatic activity exceeds 100% of the protein before mutation.
[33]
[34]
As used herein, the term "variant" means that one or more amino acids differ from the recited sequence in conservative substitution and/or modification, but the function of the protein ( functions) or properties (properties) are maintained. A variant differs from an identified sequence by several amino acid substitutions, deletions or additions. Such variants can generally be identified by modifying one of the polypeptide sequences and evaluating the properties of the modified polypeptide. That is, the ability of the variant may be increased, unchanged, or decreased compared to the native protein.
[35]
In addition, some variants may include variants in which one or more portions such as an N-terminal leader sequence or a transmembrane domain have been removed. Other variants may include variants in which a portion is removed from, or added to, the N- and/or C-terminus of the mature protein.
[36]
The term "variant" may include terms such as modified/mutated protein, mutant polypeptide, and mutant (in English expression, modified, modified protein, modified polypeptide, mutant, mutein, divergent, variant, etc.), and has a mutated meaning The term is not limited thereto.
[37]
The mutant may have increased activity of the mutated protein compared to the native wild-type or unmodified protein, but is not limited thereto.
[38]
As used herein, the term “conservative substitution” means substituting one amino acid for another amino acid having similar structural and/or chemical properties. Such variants may have, for example, one or more conservative substitutions while still retaining one or more biological activities. Such amino acid substitutions may generally occur based on similarity in polarity, charge, solubility, hydrophobicity, hydrophilicity and/or amphipathic nature of the residues. For example, positively charged (basic) amino acids include arginine, lysine, and histidine; negatively charged (acidic) amino acids include glutamic acid and aspartate; Aromatic amino acids include phenylalanine, tryptophan and tyrosine, and hydrophobic amino acids include alanine, valine, isoleucine, leucine, methionine, phenylalanine, tyrosine and tryptophan. In addition, amino acids can be classified into amino acids with electrically charged side chains and amino acids with uncharged side chains, and amino acids with charged side chains are astic acid, glutamic acid, lysine , arginine, histidine, and amino acids having uncharged side chains can be further classified as nonpolar amino acids or polar amino acids, and nonpolar amino acids are glycine, alanine, valine, leucine, and isoleucine. methionine, phenylalanine. Tryptophan, proline, and polar amino acids can be classified as containing serine, threonine, cysteine, tyrosine, asparagine, and glutamine. Usually,
[39]
In addition, variants may include deletions or additions of amino acids that have minimal effect on the properties and secondary structure of the polypeptide. For example, the polypeptide can be conjugated with a signal (or leader) sequence at the N-terminus of the protein that is involved in the transfer of the protein either co-translationally or post-translationally. The polypeptide may also be conjugated with other sequences or linkers to enable identification, purification, or synthesis of the polypeptide.
[40]
[41]
As used herein, the term "serine protease variant" refers to a polypeptide comprising one or more amino acid substitutions in the amino acid sequence of a polypeptide having serine protease activity. The serine protease variant of the present application may include an amino acid in which an amino acid at a position corresponding to amino acid 12 and/or amino acid 116 from the N-terminus of SEQ ID NO: 31 is substituted with another amino acid. Specifically, the variant may be a protein in which all amino acids corresponding to positions 12, 116, or 12 and 116 from the N-terminus in the amino acid sequence of SEQ ID NO: 31 are substituted with other amino acids. The 'other amino acid' means an amino acid different from that before the substitution, and is not limited as long as it is an amino acid other than the amino acid before the substitution.
[42]
Specifically, in the serine protease variant of the present application, phenylalanine at position 12 in the amino acid sequence of SEQ ID NO: 31 is glycine, alanine, arginine, aspartate, cysteine ), glutamate, asparagine, glutamine, histidine, proline, serine, tyrosine, isoleucine, leucine, lysine ), tryptophan, valine, methionine or threonine, and/or asparagine at position 116 is glycine, alanine, arginine, aspartate, cysteine, glutamic acid, glutamine, histidine, It may be substituted with proline, serine, tyrosine, isoleucine, leucine, lysine, phenylalanine, tryptophan, valine, methionine or threonine, but is not limited thereto.
[43]
Specifically, in the variant, the amino acid corresponding to position 12 in the amino acid sequence of SEQ ID NO: 31 is substituted with tyrosine (Y), serine (S), alanine (A) or arginine (R), or corresponding to position 116 an amino acid is substituted with aspartate (D), serine (S), threonine (T) or glycine (G), or the amino acid corresponding to positions 12 and 116 in the amino acid sequence of SEQ ID NO: 31 is tyrosine ( Y) and aspartate (D); tyrosine (Y) and serine (S); serine (S) and aspartate (D); serine (S) and threonine (T); Alternatively, it may be a protein comprising a substituted with alanine (A) and glycine (G), but is not limited thereto. It is apparent that the variant in which the amino acid at positions 12 and/or 116 in the amino acid sequence of SEQ ID NO: 31 is substituted with another amino acid includes variants in which the amino acid corresponding to the position is substituted with another amino acid.
[44]
In addition, the variant comprises the amino acid sequence set forth in SEQ ID NO: 31 as described above or at least 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97 of SEQ ID NO: 31. In an amino acid sequence having %, 98%, or 99% or more homology or identity, the amino acid at the position corresponding to amino acid 12 and/or amino acid 116 from the N-terminus of SEQ ID NO: 31 is substituted with another amino acid do.
[45]
Specifically, the variant in which the amino acid at the position corresponding to the 12th amino acid and/or the 116th amino acid is substituted with another amino acid in the amino acid sequence of SEQ ID NO: 31 among the variants is any one selected from SEQ ID NOs: 32 to 39 It may consist of an amino acid sequence described as, but is not limited thereto. wherein said variant comprises a substitution with another amino acid at a position corresponding to position 12 and/or position 116 of SEQ ID NO: 31, and at least 80%, 90%, 95%, 96%, 97 of the amino acid sequence of SEQ ID NO: 31 %, 98%, or 99% or more, and less than 100% sequence homology, and may have serine protease activity.
[46]
The serine protease variant of the present application may have enhanced activity compared to the unmodified polypeptide, the native wild-type polypeptide, or the unmodified polypeptide, but is not limited thereto. In addition, as long as it is an amino acid sequence having such homology and exhibiting efficacy corresponding to the protein, it is apparent that a protein having an amino acid sequence in which some sequences are deleted, modified, substituted or added is also included within the scope of the present application.
[47]
In addition, if it has the same or corresponding activity as the variant of the present application, in addition to the mutation of the 12th and / or the 116th amino acid that imparts a specific activity or a mutation at a position corresponding thereto, add meaningless sequences before and after the amino acid sequence of the corresponding SEQ ID NO. Or, naturally occurring mutations, or latent mutations thereof are not excluded, and it is apparent that such sequence additions or mutations fall within the scope of the present application.
[48]
On the other hand, the mature region of the NCBI Reference Sequence WP_016188200.1 (SEQ ID NO: 40) corresponds to SEQ ID NO: 31 of the present application, and the sequence except for the signal peptide in SEQ ID NO: 40 corresponds to SEQ ID NO: 2 of the present application.
[49]
The serine protease variant of the present application is a serine protease in which amino acids at positions 12 and 116 of SEQ ID NO: 31 are substituted with other amino acids as described above. Deletion or addition of amino acids having minimal effect on the properties and secondary structure of the serine protease It is obvious that it may include In addition, those skilled in the art through sequence alignment known in the art, positions 12 and 116 from the N-terminus of SEQ ID NO: 31 of the present application are positions 193 and 297 of SEQ ID NO: 40, positions 163 and 267 of SEQ ID NO: 2 It can be seen that they correspond, and SEQ ID NO: 31 is included in SEQ ID NO: 2 and SEQ ID NO: 40.
[50]
Therefore, the serine protease variant of the present application is, with respect to SEQ ID NO: 2 and SEQ ID NO: 40, including the amino acid sequence of SEQ ID NO: 31, amino acids at positions 12 and 116 of SEQ ID NO: 31 (163 and / in SEQ ID NO: 2) or amino acid at position 267, 193 and/or amino acid at position 297 in SEQ ID NO: 40) is substituted. In addition, the description of SEQ ID NO: 31 and its 12th and 116th amino acids in the present application can be applied to SEQ ID NO: 2 and its 163, 267th amino acids, and SEQ ID NO: 40 and its 193, 297th amino acids.
[51]
In one embodiment, the serine protease variant of the present application comprises an amino acid sequence in which the amino acids at positions corresponding to 12 and/or 116 of SEQ ID NO: 31 are substituted with other amino acids, and at least 80% or more with SEQ ID NO: 2, 100 It may have a sequence homology of less than %. In another embodiment, the serine protease variant of the present application may be one in which the 163 and / or 267 amino acids of SEQ ID NO: 2 are substituted with other amino acids, and have 80% or more and less than 100% sequence homology with SEQ ID NO: 2, It may have at least 80% sequence homology with any one amino acid sequence selected from SEQ ID NOs: 3 to 10. However, it is not limited thereto.
[52]
[53]
Another aspect of the present application is to provide a polynucleotide encoding the serine protease variant.
[54]
As used herein, the term "polynucleotide" refers to a DNA or RNA strand of a certain length or longer as a polymer of nucleotides in which nucleotide monomers are linked in a long chain by covalent bonds, and more specifically, encoding the variant. polynucleotide fragments.
[55]
The polynucleotide encoding the serine protease variant of the present application may include, without limitation, any polynucleotide sequence encoding the serine protease variant having enhanced activity of the present application. In the present application, the gene encoding the wild-type serine protease may be derived from a microorganism of the genus Thermobifida, specifically, may be derived from Thermobifida fusca , but is not limited thereto.
[56]
In the polynucleotide of the present application, various modifications are made to the coding region within the range that does not change the amino acid sequence of the polypeptide due to codon degeneracy or considering codons preferred in the organism to express the polypeptide. can Specifically, any polynucleotide sequence encoding a variant in which the amino acid at the position corresponding to amino acid 12 and/or amino acid 116 from the N-terminus of SEQ ID NO: 31 is substituted with another amino acid may be included without limitation.
[57]
For example, the polynucleotide of the present application is a variant of the present application, specifically, a polypeptide consisting of an amino acid sequence described in any one of SEQ ID NOs: 32 to 39 selected from SEQ ID NOs: 32 to 39, or a polypeptide having homology therewith. It may be a polynucleotide sequence, but is not limited thereto. More specifically, it may be composed of a polynucleotide sequence described in any one of SEQ ID NOs selected from SEQ ID NOs: 41 to 48, but is not limited thereto. In addition, as described above, the serine protease variant of the present application is an amino acid at a position corresponding to 12 and/or 116 of SEQ ID NO: 31 with respect to SEQ ID NO: 2 and SEQ ID NO: 40, which are amino acid sequences including SEQ ID NO: 31 (SEQ ID NO: 2 163 and/or 267 amino acids in SEQ ID NO: 40 to 193 and/or 297 amino acids) include substituted variants, and therefore polynucleotide sequences encoding the serine protease variants are also included in the scope of the present application. For example, the polynucleotide sequence encoding the serine protease variant may encode an amino acid sequence described in any one of SEQ ID NOs: 3 to 10, specifically selected from SEQ ID NOs: 23 to 30 It may be composed of a polynucleotide sequence described in any one of the SEQ ID NOs, but is not limited thereto.
[58]
In addition, by hybridizing under stringent conditions with a probe that can be prepared from a known gene sequence, for example, a sequence complementary to all or part of the nucleotide sequence, amino acid 12 from the N-terminus of SEQ ID NO: 31 and/or Any sequence encoding a protein having the activity of a mutant in which the amino acid at the position corresponding to amino acid 116 is substituted with another amino acid may be included without limitation.
[59]
The "stringent conditions" means conditions that allow specific hybridization between polynucleotides. These conditions are specifically described in the known literature. For example, genes having high homology between genes having homology of 40% or more, specifically 90% or more, more specifically 95% or more, still more specifically 97% or more, and particularly specifically 99% or more homology. Conditions that hybridize with each other and do not hybridize with genes with lower homology than that, or wash conditions for general Southern hybridization at 60°C, 1X SSC, 0.1% SDS, specifically 60°C, 0.1X SSC, 0.1% SDS, more specifically, at a salt concentration and temperature equivalent to 68° C., 0.1X SSC, 0.1% SDS, washing conditions once, specifically 2 to 3 times, can be enumerated. However, the present invention is not limited thereto, and may be appropriately adjusted by those skilled in the art according to the purpose.
[60]
Hybridization requires that two polynucleotides have complementary sequences, although mismatch between bases is possible depending on the stringency of hybridization. The term "complementary" is used to describe the relationship between nucleotide bases capable of hybridizing to each other. For example, with respect to DNA, adenosine is complementary to thymine and cytosine is complementary to guanine. Accordingly, the present application may also include substantially similar polynucleotide sequences as well as isolated polynucleotide fragments complementary to the overall sequence.
[61]
Specifically, polynucleotides having homology can be detected using hybridization conditions including a hybridization step at a Tm value of 55° C. and using the conditions described above. In addition, the Tm value may be 60° C., 63° C. or 65° C., but is not limited thereto and may be appropriately adjusted by those skilled in the art according to the purpose.
[62]
The appropriate stringency for hybridizing polynucleotides depends on the length and degree of complementarity of the polynucleotides, and the parameters are well known in the art.
[63]
[64]
Another aspect of the present application is to provide a vector comprising a polynucleotide encoding the serine protease variant of the present application.
[65]
As used herein, the term "vector" refers to a DNA preparation containing the nucleotide sequence of a polynucleotide encoding the target protein operably linked to a suitable regulatory sequence so that the target protein can be expressed in a suitable host. Such regulatory sequences may include a promoter capable of initiating transcription, an optional operator sequence for regulating such transcription, a sequence encoding a suitable mRNA ribosome binding site, and a sequence regulating the termination of transcription and translation. After transformation into an appropriate host cell, the vector can replicate or function independently of the host genome, and can be integrated into the genome itself.
[66]
As used herein, the term “operably linked” means that a promoter sequence that initiates and mediates transcription of a polynucleotide encoding a target protein of the present application and the polynucleotide sequence are functionally linked. The operable linkage may be prepared using a genetic recombination technique known in the art, and site-specific DNA cleavage and ligation may be made using a cleavage and ligation enzyme in the art, but is not limited thereto.
[67]
The vector used in the present application is not particularly limited, and any vector known in the art may be used. Examples of commonly used vectors include plasmids, cosmids, viruses and bacteriophages in a natural or recombinant state. For example, pWE15, M13, MBL3, MBL4, IXII, ASHII, APII, t10, t11, Charon4A, and Charon21A may be used as phage vectors or cosmid vectors, and pBR-based, pUC-based, and pBluescriptII-based plasmid vectors may be used as plasmid vectors. , pGEM-based, pTZ-based, pCL-based, pET-based, pUB110-based and the like can be used. Specifically, pDZ, pACYC177, pACYC184, pCL, pECCG117, pUC19, pBR322, pMW118, pCC1BAC, pSM704 vectors and the like can be used. The vector usable in the present application is not particularly limited, and a known expression vector may be used.
[68]
In one embodiment, a polynucleotide encoding a target mutant in a chromosome may be replaced with a mutated polynucleotide through a vector for intracellular chromosome insertion. Insertion of the polynucleotide into a chromosome may be performed by any method known in the art, for example, homologous recombination, but is not limited thereto. It may further include a selection marker (selection marker) for confirming whether the chromosome is inserted. The selection marker is used to select cells transformed with the vector, that is, to confirm whether a target nucleic acid molecule is inserted, and selectable phenotypes such as drug resistance, auxotrophic tolerance, resistance to cytotoxic agents, or expression of a surface variant polypeptide. Markers that give ? may be used. In an environment treated with a selective agent, only the cells expressing the selectable marker survive or exhibit other expression traits, so that the transformed cells can be selected.
[69]
[70]
Another aspect of the present application is to provide a microorganism expressing the serine protease variant of the present application.
[71]
As used herein, the term "to be/are/are" a protein may refer to a state in which a target protein is introduced into a microorganism or modified to be expressed in the microorganism. For the purposes of the present application, the "protein of interest" may be the aforementioned serine protease variant.
[72]
Specifically, "introduction of protein" may mean that the microorganism exhibits the activity of a specific protein that it did not originally have, or exhibits improved activity compared to the intrinsic activity or activity before modification of the corresponding protein. For example, a polynucleotide encoding a specific protein may be introduced into a chromosome in a microorganism, or a vector including a polynucleotide encoding a specific protein may be introduced into the microorganism to exhibit its activity.
[73]
[74]
The microorganism expressing the serine protease variant may include one or more of the serine protease variant of the present application, a polynucleotide encoding the same, and a vector including the same.
[75]
The microorganism comprising at least one of the serine protease variant, the polynucleotide encoding the variant, and a vector comprising the same, specifically, may be a microorganism produced by transformation with a vector comprising a polynucleotide encoding the variant, but not limited
[76]
[77]
The microorganism may be a recombinant microorganism, and the recombination may be accomplished by genetic modification such as transformation.
[78]
As used herein, the term "transformation" refers to introducing a vector including a polynucleotide encoding a target protein into a host cell so that the protein encoded by the polynucleotide can be expressed in the host cell. The transformed polynucleotide may include all of them regardless of whether they are inserted into the chromosome of the host cell or located outside the chromosome, as long as they can be expressed in the host cell. In addition, the polynucleotide includes DNA and RNA encoding a target protein. As long as the polynucleotide can be introduced and expressed into a host cell, it may be introduced in any form. For example, the polynucleotide may be introduced into a host cell in the form of an expression cassette, which is a gene construct including all elements necessary for self-expression. The expression cassette may include a promoter operably linked to the polynucleotide, a transcription termination signal, a ribosome binding site, and a translation termination signal. The expression cassette may be in the form of an expression vector capable of self-replication. In addition, the polynucleotide may be introduced into a host cell in its own form and operably linked to a sequence required for expression in the host cell, but is not limited thereto. The transformation method includes any method of introducing a polynucleotide into a cell, and may be performed by selecting a suitable standard technique as known in the art depending on the host cell. For example, electroporation, calcium phosphate (Ca(H 2PO 4 ) 2 , CaHPO 4 , or Ca 3 (PO 4 ) 2 ) precipitation, calcium chloride (CaCl 2 ) precipitation, microinjection, polyethylene glycol (PEG) method, DEAE-dextran method, cationic liposome method, natural natural competence (see, eg, Perry and Kuramitsu, 1981, Infect. Immun . 32: 1295-1297) and lithium acetate-DMSO method, but are not limited thereto.
[79]
[80]
The recombinant microorganism may have enhanced serine protease activity of the present application.
[81]
The "enhancement of activity" may mean that the activity is improved compared to the intrinsic activity or activity before modification of a specific protein of the microorganism. "Intrinsic activity" may refer to the activity of a specific protein originally possessed by the parent strain prior to transformation when the trait of a microorganism is changed due to genetic variation caused by natural or artificial factors.
[82]
Specifically, in the present application, the enhancement of the activity of the protein variant includes increasing the intracellular copy number of the gene encoding the protein variant, a method of introducing a mutation into the expression control sequence of the gene encoding the protein variant, and the protein variant A method of replacing the coding gene expression control sequence with a sequence with strong activity, a method of replacing a gene encoding a native protein having serine protease activity on a chromosome with a gene encoding the protein variant, the activity of the protein variant is enhanced Any one or more of the methods of additionally introducing a mutation into the gene encoding the mutant as possible may be used, but the present invention is not limited thereto.
[83]
Next, modifying the expression control sequence to increase the expression of the polynucleotide, but is not particularly limited thereto, to further enhance the activity of the expression control sequence, deletion, insertion, non-conservative or conservative substitution of the nucleic acid sequence, or their It can be carried out by inducing a mutation in the sequence in combination, or by replacing it with a nucleic acid sequence having a stronger activity. The expression control sequence is not particularly limited thereto, but may include a promoter, an operator sequence, a sequence encoding a ribosome binding site, a sequence for regulating the termination of transcription and translation, and the like.
[84]
A strong promoter may be linked to the upper portion of the polynucleotide expression unit instead of the original promoter, but is not limited thereto. Examples of known strong promoters include cj1 to cj7 promoter (Korean Patent No. 10-0620092), lac promoter, trp promoter, trc promoter, tac promoter, lambda phage PR promoter , PL promoter, tet promoter, gapA promoter, SPL7 promoter, SPL13(sm3) promoter (Republic of Korea Patent No. 10-1783170), O2 promoter (Korean Patent No. 10-1632642), tkt promoter and yccA promoter, but are not limited thereto.
[85]
In addition, the modification of the polynucleotide sequence on the chromosome is not particularly limited thereto, but a mutation in the expression control sequence by deleting, inserting, non-conservative or conservative substitution of a nucleic acid sequence or a combination thereof to further enhance the activity of the polynucleotide sequence. It can be carried out by inducing or replacing the polynucleotide sequence improved to have stronger activity.
[86]
Incorporation and enhancement of such protein activity is generally performed such that the activity or concentration of the corresponding protein is at least 1%, 10%, 25%, 50%, based on the activity or concentration of the protein in the wild-type or unmodified microbial strain. It may be increased by 75%, 100%, 150%, 200%, 300%, 400% or 500%, up to 1000% or 2000%, but is not limited thereto.
[87]
[88]
The host cell or microorganism of the present application may be any microorganism expressing a serine protease variant including the polynucleotide of the present application or the vector of the present application. Specifically, Escherichia genus, Serratia genus, Erwinia genus, Enterobacteria genus, Providencia genus, Salmonella genus, Streptomyces ( Streptomyces genus, Pseudomonas genus, Brevibacterium genus, Corynebacterium genus or microbial strains such as Bacillus genus, specifically Bacillus subtilis, Bacillus licheniformis, Bacillus amyloliquefaciens, Bacillus velezensis, Escherichiacoli, Corynebacterium glutamicum, Aspergillus Orije (Aspergillusoryzae) may be a strain such as, more specifically, Bacillus subtilis (Bacillus subtilis), but is not limited thereto.
[89]
[90]
Another aspect of the present application is a serine protease variant of the present application; And it provides a composition for feed, comprising one or more of the microorganisms expressing the same.
[91]
The serine protease variant included in the composition for feed of the present application may include the microorganism itself expressing it, or may be in a form separated and purified from the microorganism expressing it, but is not limited thereto.
[92]
The "composition for feed" of the present application is any natural or artificial diet, one meal, etc., or a component of the one meal meal for animals to eat, ingest, and digest or suitable for, and the feed may be prepared in various forms known in the art. It can be manufactured as feed.
[93]
The composition for feed may be a feed additive.
[94]
The type of feed is not particularly limited, and feed commonly used in the art may be used. Non-limiting examples of the feed include plant feeds such as grains, root fruits, food processing by-products, algae, fibers, pharmaceutical by-products, oils and fats, starches, gourds or grain by-products; and animal feeds such as proteins, inorganic materials, oils and fats, minerals, oils and fats, single cell proteins, zooplankton, or food. These may be used alone or in combination of two or more.
[95]
The composition for feed of the present application includes organic acids such as citric acid, humic acid, adipic acid, lactic acid and malic acid; phosphates such as sodium phosphate, potassium phosphate, acid pyrophosphate, polyphosphate (polyphosphate) and the like; Polyphenol, catechin, alpha-tocopherol, rosemary extract, vitamin C, green tea extract, licorice extract, natural antioxidants such as chitosan, tannic acid, phytic acid, etc.; may further include one or more selected from have.
[96]
The composition for feed of the present application includes auxiliary components such as amino acids, inorganic salts, vitamins, antibiotics, antibacterial substances, antioxidants, antifungal enzymes and other live cell types of microbial preparations; grains such as milled or shredded wheat, oats, barley, corn and rice; plant protein feeds, such as those based on rape, soybean and sunflower; animal protein feeds such as blood meal, meat meal, bone meal and fish meal; Dry ingredients consisting of sugar and dairy products, for example, various powdered milk and whey powder; lipids, for example main components such as animal fats and vegetable fats optionally liquefied by heating; It may further include one or more selected from; additives such as nutritional supplements, digestion and absorption enhancers, growth promoters, disease prevention agents, and the like.
[97]
The composition for feed of the present application may be in the form of a dry or liquid formulation, and may include an excipient for adding feed. The excipient for adding the feed includes, for example, zeolite, jade powder or rice bran, but is not limited thereto.
[98]
The composition for feed of the present application may further include an enzyme preparation other than the serine protease variant. For example, lipolytic enzymes such as lipase, phytase that breaks down phytic acid to produce phosphate and inositol phosphate, alpha-1,4-glycosidic bonds contained in starch and glycogen, etc. Amylase, an enzyme that hydrolyzes (α-1,4-glycoside bond), phosphatase, an enzyme that hydrolyzes organophosphate, maltase, which hydrolyzes maltose into two molecules of glucose, and saccharose It may further include one or more selected from converting enzymes that make a glucose-fructose mixture. However, it is not limited thereto.
[99]
The composition for feed of the present application may be administered to an animal alone or in combination with other feed additives in an edible carrier. In addition, the composition for feed can be easily administered as a feed additive, as a top dressing, directly mixing them into livestock feed, or separately from the feed, in a separate oral dosage form, or in combination with other ingredients. It is also possible to use a single daily intake or divided daily intakes as is commonly known in the art.
[100]
Animals to which the composition for feed of the present application can be used include, for example, livestock such as edible cattle, dairy cows, calves, pigs, piglets, sheep, goats, horses, rabbits, dogs, cats, chicks, roosters, domestic chickens, roosters, including, but not limited to, poultry such as ducks, geese, turkeys, quails, small birds, and the like.
[101]
The amount of the serine protease variant of the present application included in the composition for feed of the present application is not particularly limited and may be appropriately adjusted according to the purpose. In one embodiment, as commonly known in the art to which the present application pertains, it may be included in an amount suitable for decomposing the protein source material while surviving for a long time in the digestive tract of livestock, but is not limited thereto.
[102]
[103]
Another aspect of the present application is a serine protease variant of the present application; And it provides a food composition comprising one or more of the microorganisms expressing the same. The protease protein may be used in a food composition in liquid or solid form. In addition, the food may be an additive of powder, pills, beverages, tea or general food.
[104]
In one embodiment, the food may be a food group requiring a protease, such as dairy products, health functional food for defecation or diet, and functional health functional food for preventing hypertension.
[105]
In another embodiment, the protease variant may be included in various food compositions and used as a solubilizing or softening agent of food, or a meat quality modifier. In other various embodiments, it may be added to the baking process and used in the step of breaking the gluten network. Alternatively, it can be used to hydrolyze food proteins (eg, proteins in milk). Alternatively, it may be included in various food compositions for purposes such as rendering, flavor preparation, bitterness reduction, emulsification properties change, bioactive peptide production, protein allergen reduction, etc., but this is an example, It is not limited to one use.
[106]
The amount of the serine protease variant in the food composition can be appropriately adjusted by those skilled in the art according to the purpose.
[107]
[108]
Another aspect of the present application is a serine protease variant of the present application; And it provides a detergent composition comprising one or more of the microorganisms expressing the same.
[109]
The detergent composition according to the present application may be in the form of one-part and two-part aqueous detergent compositions, non-aqueous liquid detergent compositions, cast solids, granules, particles, compressed tablets, gels, pastes or slurries. The detergent composition may be used to remove food residues and other small amounts of food composition when food is stagnant.
[110]
The detergent composition according to the present application may be provided in the form of a detergent composition for cleaning a hard surface, a detergent composition for cleaning fabric, a detergent composition for washing dishes, a detergent composition for mouth washing, a detergent for cleaning dentures, or a contact lens cleaning solution. . However, it is not limited thereto.
[111]
[112]
Another aspect of the present application is a serine protease variant of the present application; And it provides a pharmaceutical composition comprising one or more of the microorganisms expressing the same.
[113]
The pharmaceutical composition of the present application is a pharmaceutical composition for digestive enzymes for improving digestive diseases, digestive abnormalities, and abnormal diseases after digestive surgery, a thrombolytic agent or antithrombotic composition that dissolves fibrin by acting directly on a blood clot, an in vivo defense system and use as an anti-inflammatory agent to remove inflammatory substances or necrotic tissue by acting as an anti-inflammatory agent or to relieve edema after surgery or trauma.
[114]
The pharmaceutical composition may further include a pharmaceutically acceptable or nutritionally acceptable carrier, excipient, diluent or sub-component depending on the method and purpose of use. The carrier, excipient or diluent may be lactose, dextrose, sucrose, sorbitol, mannitol, xylitol, erythritol, maltitol, starch, acacia gum, alginate, gelatin, calcium phosphate, calcium silicate, cellulose, methyl cellulose, microcrystalline cellulose 1 selected from the group consisting of oil, polyvinyl pyrrolidone, water, methylhydroxybenzoate, propylhydroxybenzoate, talc, magnesium stearate and mineral oil, dextrin, calcium carbonate, propylene glycol, liquid paraffin, and physiological saline It may be above, but is not limited thereto.
[115]
[116]
The serine protease mutant or microorganism expressing the serine protease of the present application may be used for, for example, cosmetics, leather processing, pharmaceuticals, diagnostics, waste management, and chemical preparation for academic research in addition to the above-mentioned uses. However, the above use is an example, and other uses may be used for any purpose related to denaturation, decomposition or removal of proteinaceous substances known in the art.
[117]
Modes for carrying out the invention
[118]
Hereinafter, the present application will be described in more detail through Examples and Experimental Examples. However, these Examples and Experimental Examples are for illustrative purposes of the present application, and the scope of the present application is not limited to these Examples and Experimental Examples.
[119]
[120]
Example 1. Selection of serine protease variants derived from Thermobifida fusca
[121]
Example 1-1: Thermobifida fusca- derived serine protease library construction
[122]
A random mutation was introduced through error-prone PCR into a gene encoding an amino acid (SEQ ID NO: 31) corresponding to the mature region of the Thermobifida fusca -derived serine protease. For error prone PCR, Diversify™ PCR Random Mutagenesis Kit (Clontech, Cat# 630703) was used, and PCR conditions are as shown in [Table 1]. When proceeding under the following conditions, it was confirmed that mutations were inserted at a frequency of 6.2 mutations/Kb.
[123]
[124]
[Table 1]
[125]
[126]
The PCR fragment obtained through the above process was ligated to the vector amplified using the primers shown in [Table 2] using the In-FusionR HD cloning kit (clontech), and then transformed into DH5α to obtain colonies. The plasmid was purified from the obtained colony to obtain a library of about 5*10 4 size.
[127]
[128]
[Table 2]
[129]
[130]
Example 1-2: Thermobifida fusca-derived serine protease library screening
[131]
Screening was performed by transforming the protease library prepared in Example 1-1 into a Bacillus subtilis LB700 strain that facilitates protein secretion. Screening was carried out in a total of two stages. Step 1 is a method of selecting a library-transformed Bacillus subtilis strain based on the size of the formed halo after spreading it on a 2% skim milk plate. Bacillus subtilis transformation was carried out according to the Groningen method, and the composition of the skim milk plate used for screening is shown in [Table 3].
[132]
[133]
[Table 3]
[134]
(based on 1L)
[135]
[136]
Step 2 is a method of screening the colonies primarily selected in step 1 through Azocasein color development. A BHI (Brain Heart Infusion, bd, cat#53286) liquid medium containing kanamycin antibiotics was put in a 96 deep well plate, and the colonies selected in step 1 were inoculated and cultured at 37°C for 20-24 hours. After incubation, the supernatant containing the enzyme was obtained through centrifugation, and the supernatant and the substrate, 2% (w/v) Azocasein, were mixed in equal amounts, followed by reaction at 37° C. for 1 hour. The reaction was stopped by adding 10% trichloro acetic acid (TCA) to the enzyme reaction solution in 3 times the volume, and the coagulated protein was removed by centrifugation. The color development was compared by measuring the absorbance at 440 nm after the color reaction was carried out by mixing the same amount of NaOH. Through this process, colonies whose absorbance was increased by 150% or more compared to the wild-type serine protease were selected.
[137]
[138]
Example 2. Preparation of selected variants and evaluation of activity
[139]
Example 2-1: Variant construction
[140]
As a result of sequence analysis of the mutants selected through screening, it was finally confirmed that the 12th amino acid (phenylalanine, Phe) and the 116th amino acid (asparagine, Asn) of SEQ ID NO: 31 are substituted with tyrosine (Tyr) and aspartate (Asp), respectively. Confirmed. In [Fig. 1], the position of the mutation is indicated. The two selected mutants (F12, N116) were re-introduced into the pBE-S-TAP plasmid in a single mutant form through site directed mutagenesis, and then the activity of the double mutation and the single mutant form was compared and evaluated with that of the wild type. The primers used to prepare the mutant are shown in [Table 4].
[141]
[142]
[Table 4]
[143]
[144]
Example 2-2: Activity evaluation
[145]
After transforming the prepared plasmid into the Bacillus subtilis LB700 strain and expressing it, N-SUCCINYL-ALA-ALA-PRO-PHE-P-NITROANILIDE (Sigma, cat#S7388, hereinafter referred to as SUC-AAPF-pNA) Activity was evaluated using the peptide as a substrate. The transformed Bacillus subtilis strain was inoculated in BHI medium containing kanamycin antibiotic and cultured at 37°C for 20-24 hours. After mixing with AAPF-pNA, it was reacted at 37°C for 30 minutes. The absorbance of the reaction solution was measured at 410 nm. The extinction coefficient known in the literature of the enzyme product para-nitroaniline is 8,800M -1 cm -1 at 410 nm , and the unit of the enzyme was converted based on this (Barrett, AJ, Cathepsin G. Methods Enzymol., 80, Pt. C, 561-565, (1981)). The measured activity is shown in [Table 5].
[146]
[147]
[Table 5]
[148]
[149]
As a result of the measurement, it was confirmed that the activity of the F12Y and F12YN116D mutants was increased by about 2.1 times and 3.9 times, respectively, compared to the wild type at pH 7.5 and 37 ° C.
[150]
[151]
Example 2-3: Thermal stability evaluation
[152]
Since thermostability is a very important characteristic of the enzyme, the following experiment was conducted to confirm the effect on thermostability upon introduction of the mutant.
[153]
Specifically, the same sample subjected to the activity evaluation in Example 2-2 was left at room temperature, 70°C, 80°C, and 90°C for 5 minutes, respectively, and then the enzyme activity was measured. The measured activity is shown in [Table 6].
[154]
[155]
[Table 6]
[156]
[157]
As a result of the measurement, it was confirmed that the F12Y and F12YN116D mutations maintained about 2 times and about 4 times the enzymatic activity compared to the wild type, respectively, even at 80 °C. Through this, it was confirmed that the serine protease variant of the present application maintains high activity even at high temperatures, and thus can be usefully used industrially.
[158]
[159]
Example 3. Saturation mutagenesis library production and selection
[160]
Example 3-1. F12, N116 residue saturation mutation library construction
[161]
In order to confirm the effect on activity by substituting residues other than tyrosine and aspartate for residues F12 and N116, which are previously selected mutants, a saturated mutant library was prepared for two residues.
[162]
Two PCR fragments were obtained using pBE-S-TAP as a template and primers of SEQ ID NOs: 11 and 12 and SEQ ID NOs: 13 and 14, respectively, ligated using In-Fusion HD cloning kit, and transformed into DH5α colonies were obtained. The plasmid was purified from the obtained colony to obtain a library of about 4x10 3 size.
[163]
[164]
[Table 7]
[165]
[166]
Example 3-2: Saturated mutant library screening and activity evaluation
[167]
The saturated mutant library prepared in Example 3-1 was screened in the same manner as described in Example 1-2. Through screening, mutants having the same or increased activity compared to the F12YN116D mutant were selected, and the mutants were subjected to sequence analysis and activity evaluation using Suc-AAPF-pNA as a substrate.
[168]
[169]
[Table 8]
[170]
[171]
As a result, the F12 and N116 residues showed an increase in activity even when substituted with other amino acids such as F12S, F12A, F12R, N116S, N116T, and N116G in addition to tyrosine and aspartate confirmed in Example 2.
[172]
Through this, it was confirmed that the F12 and N116 residues are important residues for serine protease enzyme activity, and it was confirmed that the enzyme activity could be increased by substituting it with other amino acids. can be used
[173]
[174]
From the above description, those skilled in the art to which the present application pertains will understand that the present application may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. In this regard, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present application should be construed as including all changes or modifications derived from the meaning and scope of the claims to be described later rather than the above detailed description and equivalent concepts thereof.
Claims
[Claim 1]
Any one or more amino acids selected from the amino acid corresponding to the 12th position and the amino acid corresponding to the 116th position of SEQ ID NO: 31 are substituted with other amino acids, and at least 80% or more and less than 100% of the amino acid sequence of SEQ ID NO: 31 A serine protease variant with homology.
[Claim 2]
The serine protease variant according to claim 1, wherein the amino acid corresponding to the 12th position is substituted with tyrosine (Y, tyrosine), alanine (A, Alanine), serine (S, Serine) or arginine (R, Arginine).
[Claim 3]
According to claim 1, wherein the amino acid corresponding to position 116 is substituted with aspartate (D, aspartate), serine (S, Serine), threonine (T, Threonine), or glycine (G, Glycine), serine Protease variants.
[Claim 4]
A serine protease variant comprising the amino acid sequence of the serine protease variant of claim 1 and having at least 80% or more and less than 100% sequence homology to SEQ ID NO: 2.
[Claim 5]
The serine protease variant according to claim 1, wherein the variant consists of an amino acid sequence set forth in any one SEQ ID NO: selected from the group consisting of SEQ ID NOs: 3 to 10 and SEQ ID NOs: 32 to 39.
[Claim 6]
A polynucleotide encoding the serine protease variant of any one of claims 1-5.
[Claim 7]
A vector comprising the polynucleotide of claim 6.
[Claim 8]
A microorganism expressing the serine protease variant of any one of claims 1 to 5.
[Claim 9]
The microorganism according to claim 8, wherein the microorganism is of the genus Bacillus.
[Claim 10]
The microorganism according to claim 9, wherein the microorganism is Bacillus subtilis .
[Claim 11]
The serine protease variant of claim 1; And comprising one or more of the microorganisms expressing the same, a composition for feed.