WO2022186487A1 - 이소프로필말레이트 신타제 변이체 및 이를 이용한 l-류신의 생산 방법 - Google Patents
이소프로필말레이트 신타제 변이체 및 이를 이용한 l-류신의 생산 방법 Download PDFInfo
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1025—Acyltransferases (2.3)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/77—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Corynebacterium; for Brevibacterium
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/06—Alanine; Leucine; Isoleucine; Serine; Homoserine
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y203/00—Acyltransferases (2.3)
- C12Y203/03—Acyl groups converted into alkyl on transfer (2.3.3)
- C12Y203/03013—2-Isopropylmalate synthase (2.3.3.13)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/15—Corynebacterium
Definitions
- the present application relates to an isopropyl malate synthase variant and a method for producing L-leucine using the same.
- L-leucine is a kind of essential amino acid and is an expensive amino acid widely used in medicine, food, feed additive, and industrial medicine, and is mainly produced using microorganisms. Fermentation production of branched chain amino acids including L-leucine is mainly made through microorganisms of the genus Escherichia or Corynebacterium, and 2-ketoisocaproate is produced from pyruvic acid through several steps. It is known to be biosynthesized as a precursor (Korean Patent No. 10-0220018, Korean Patent No. 10-0438146).
- Isopropylmalate synthase an enzyme involved in L-leucine biosynthesis, replaces 2-ketoisovalerate generated in the valine biosynthesis pathway with isopropyl malate required for leucine biosynthesis instead of valine.
- isopropylmalate is an enzyme in the first step of leucine biosynthesis, which is an important enzyme in the process of leucine biosynthesis.
- the isopropyl malate synthase is subjected to feedback inhibition by the final product, L-leucine or a derivative thereof. Accordingly, there are various prior technologies for isopropyl malate synthase mutants whose feedback inhibition is released for the purpose of producing high-concentration leucine (US Patent Publication No. 2015-0079641, US Patent Registration No. 6403342), but still better variants are discovered research is ongoing.
- One object of the present application is to provide a variant polypeptide having isopropylmalate synthase (isopropylmalate synthase) activity.
- Another object of the present application is to provide a polynucleotide encoding the variant polypeptide of the present application.
- Another object of the present application is to provide a vector comprising the polynucleotide of the present application.
- Another object of the present application is the variant polypeptide of the present application; a polynucleotide encoding it; Or a vector comprising the same; to provide a microorganism containing, L- leucine-producing Corynebacterium ( The genus of Corynebacterium ).
- Another object of the present application is the variant polypeptide of the present application; a polynucleotide encoding it; Or a vector comprising the same; to provide a method for producing L- leucine, comprising the step of culturing a microorganism of the genus Corynebacterium that produces L-leucine in a medium.
- Another object of the present application is a Corynebacterium glutamicum strain comprising the variant polypeptide of the present application or the polynucleotide of the present application; Or to provide a composition for the production of L- leucine comprising; or a culture medium thereof.
- the mutant polypeptide having isopropylmalate synthase activity has increased activity compared to wild-type isopropylmalate synthase, and it can be applied to mass production of L-leucine in high yield.
- One aspect of the present application for achieving the above object provides a variant polypeptide having isopropylmalate synthase (isopropylmalate synthase) activity.
- the amino acid residue at the position 138 is substituted with another amino acid residue in the amino acid sequence of SEQ ID NO: 1, ii) the amino acid residue at the position 162 is substituted with another amino acid residue , iii) the amino acid residue at the 211th position is substituted with another amino acid residue, iv) the amino acid residue at the 245th position is substituted with another amino acid residue, and v) the amino acid residue at the 588th position is It may include any one or more substitutions selected from the group consisting of substitutions with other amino acid residues.
- IPMS isopropylmalate synthase
- the LeuA sequence may be obtained from GenBank of NCBI, which is a known database, and specifically, it may be a protein having isopropylmalate synthase activity encoded by the leuA gene, but is not limited thereto.
- the LeuA may be an enzyme derived from a microorganism of the genus Corynebacterium, and specifically, may be isopropyl malate synthase derived from Corynebacterium glutamicum .
- LeuA of the present application may include the amino acid sequence of SEQ ID NO: 1, but is not limited thereto.
- the LeuA may include a polypeptide having at least 80%, 90%, 95%, 96%, 97%, 98%, or 99% homology to the amino acid sequence of SEQ ID NO: 1.
- 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. self-evident
- conservative substitution means substituting an amino acid for another amino acid having similar structural and/or chemical properties. Such amino acid substitutions may generally occur based on similarity in the polarity, charge, solubility, hydrophobicity, hydrophilicity and/or amphipathic nature of the residues. Typically, conservative substitutions may have little or no effect on the activity of the protein or polypeptide.
- LeuA of the present application may have, consist of, or consist essentially of, the amino acid sequence of SEQ ID NO: 1 or an amino acid sequence having 90% or more identity therewith.
- variant polypeptide means that one or more amino acids are conservatively substituted and/or modified so that they differ from the amino acid sequence before the mutation of the variant polypeptide, but have functions or Refers to a polypeptide in which properties are maintained.
- variant polypeptides can generally be identified by modifying one or more amino acids in the amino acid sequence of the polypeptide and evaluating the properties of the modified polypeptide. That is, the ability of the variant polypeptide may be increased, unchanged, or decreased compared to the polypeptide before the mutation.
- variant polypeptides may include variant polypeptides in which one or more portions, such as an N-terminal leader sequence or a transmembrane domain, have been removed.
- variant polypeptides may include variant polypeptides in which a portion has been removed from the N- and/or C-terminus of the mature protein.
- mutant polypeptide may be used interchangeably with terms such as variant, modified, mutated protein, mutant and mutant (in English, modified, modified polypeptide, modified protein, mutant, mutein, divergent, etc.), If it is a term used in a mutated meaning, it is not limited thereto.
- variant polypeptides may contain deletions or additions of amino acids that have minimal effect on the properties and secondary structure of the polypeptide.
- a signal (or leader) sequence involved in protein translocation may be conjugated to the N-terminus of the variant polypeptide, either co-translationally or post-translationally.
- the variant polypeptide may be conjugated with other sequences or linkers for identification, purification, or synthesis.
- the variant polypeptide of the present application may have isopropylmalate synthase activity.
- the variant polypeptide of the present application may have enhanced isopropylmalate synthase activity compared to a wild-type polypeptide having isopropylmalate synthase activity.
- the amino acid residue at position 138 is substituted with another amino acid residue
- the amino acid residue at position 162 is substituted with another amino acid residue
- the amino acid residue at position 211 is substituted with another amino acid residue
- the amino acid residue at position 245 is substituted with another amino acid residue
- the amino acid residue at position 588 is different It may include any one or more substitutions selected from the group consisting of substitutions with amino acid residues, and specifically, i) in the amino acid sequence of SEQ ID NO: 1, i) leucine, which is the amino acid residue at the 138th position, is an amino acid other than leucine.
- histidine which is the amino acid residue at position 162 is substituted with an amino acid residue other than histidine
- serine which is the amino acid residue at position 211, is substituted with an amino acid residue other than serine
- asparaginine which is the amino acid residue at position 245, is substituted with an amino acid residue other than asparaginine
- v) isoleucine which is the amino acid residue at position 588, is replaced with an amino acid residue other than isoleucine.
- It may include any one or more substitutions selected from the group consisting of substitutions, and more specifically, i) in the amino acid sequence of SEQ ID NO: 1, i) leucine, an amino acid residue at the position corresponding to the 138th position, is substituted with glycine, ii) the 162th position Histidine, the amino acid residue at the position corresponding to substitution, and v) may include any one or more substitutions selected from the group consisting of a substitution of proline for isoleucine, which is the amino acid residue at the position corresponding to the 588th, and further It may contain one or more, 2 or more, 3 or more, 4 or more, 5 substitutions by volume.
- the two or more substitutions are a combination of i) and v); a combination of ii) and v); a combination of iii) and v); or a combination of iv) and v), but is not limited thereto.
- the four or more substitutions may be a combination of i), ii), iii), and iv), but is not limited thereto.
- the five or more substitutions may be a combination of i), ii), iii), iv) and v).
- the variant polypeptide of the present application may be one having / comprising the amino acid sequence of SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or SEQ ID NO: 12 or SEQ ID NO: 14, or SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or It may consist of / consist essentially of the amino acid sequence of SEQ ID NO: 12 or SEQ ID NO: 14.
- the variant polypeptide of the present application comprises at least 80%, 90%, 95%, 96%, 97%, 98%, or Having at least 99% identity or homology with less than 100% identity, i) the amino acid at the 138th position in the amino acid sequence of SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or SEQ ID NO: 12 or SEQ ID NO: 14 the residue is glycine, ii) the amino acid residue at position 162 is glutamate, iii) the amino acid residue at position 211 is leucine, iv) the amino acid residue at position 245 is serine, or v) 588 and a polypeptide in which the amino acid residue at the position corresponding to the second is proline.
- SEQ ID NO: 6 may be an amino acid sequence in which leucine, which is an amino acid residue at a position corresponding to the 138th position in the amino acid sequence of SEQ ID NO: 1, is substituted with glycine, and SEQ ID NO: 8 is an amino acid at a position corresponding to the 162th position
- the residue histidine may be an amino acid sequence in which glutamate is substituted
- SEQ ID NO: 10 may be an amino acid sequence in which serine, an amino acid residue at the position corresponding to the 211th position, is substituted with leucine
- SEQ ID NO: 12 is at position 588 It may be an amino acid sequence in which isoleucine, which is an amino acid residue at the corresponding position, is substituted with proline
- SEQ ID NO: 14 may be an amino acid sequence in which asparaginine, which is an amino acid residue at the 245th position, is substituted with serine.
- amino acid sequence having such identity or homology and exhibiting efficacy corresponding to the variant polypeptide of the present application is i) 138 in the amino acid sequence of SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or SEQ ID NO: 12 or SEQ ID NO: 14
- Variant polypeptides having an amino acid sequence in which some sequence is deleted, modified, substituted, conservatively substituted or added other than the th, ii) 162 th, iii) 211 th, iv) 245 th, or v) 588 th are also disclosed in the present application. It may be obvious that it is included within the scope.
- the substitution is (1) in which G, which is the 1673th nucleotide of the leuA gene encoding isopropylmalate synthase, is substituted with A, and arginine, the amino acid at the 558th position of the LeuA protein, is substituted with histidine.
- the 739th and 740th nucleotides of CC may include any one or more of mutations (P247C) in which TG is substituted and proline, the 247th amino acid, is substituted with cysteine, as described above.
- the variant polypeptide comprises i) the 247th, 558th and 561th mutations in addition to the 138th mutation (SEQ ID NO: 38); or ii) comprising the 247th, 558th and 561th mutations in addition to the 162th mutation (SEQ ID NO: 40); or iii) comprising the 247, 558 and 561 mutations in addition to the 211 th mutation (SEQ ID NO: 42); iv) comprising the 247th, 558th and 561th mutations in addition to the 245th mutation (SEQ ID NO: 44); v) comprising the 247, 558 and 561 th and mutations in addition to the 588 th mutation (SEQ ID NO: 46); iii) comprising the 247, 558 and 561 mutations in addition to the 211 th and v) 588 mutations (SEQ ID NO: 48); i) 138 th, ii) 162 th, iii) 211 th
- corresponding to refers to an amino acid residue at a position listed in a polypeptide, or an amino acid residue similar to, identical to, or homologous to a residue listed in a polypeptide. Identifying an amino acid at a corresponding position may be determining a specific amino acid in a sequence that refers to a specific sequence.
- corresponding region generally refers to a similar or corresponding position in a related protein or reference protein.
- any amino acid sequence is aligned with SEQ ID NO: 1, and based on this, each amino acid residue of the amino acid sequence can be numbered with reference to the numerical position of the amino acid residue corresponding to the amino acid residue of SEQ ID NO: 1.
- a sequence alignment algorithm such as that described in this application can identify the position of an amino acid, or a position at which modifications, such as substitutions, insertions, or deletions, occur compared to a query sequence (also referred to as a "reference sequence").
- Such alignments include, for example, the Needleman-Wunsch algorithm (Needleman and Wunsch, 1970, J. Mol. Biol. 48: 443-453), the Needleman program in the EMBOSS package (EMBOSS: The European Molecular Biology Open Software Suite, Rice et al. , 2000), Trends Genet. 16: 276-277), etc., but is not limited thereto, and a sequence alignment program known in the art, a pairwise sequence comparison algorithm, etc. may be appropriately used.
- the term 'homology' or 'identity' refers to the degree of similarity between two given amino acid sequences or nucleotide sequences and may be expressed as a percentage.
- the terms homology and identity can often be used interchangeably.
- 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 are generally capable of hybridizing with all or part of a sequence under moderate or high stringent conditions. It is apparent that hybridization also includes hybridization with polynucleotides containing common codons or codons taking codon degeneracy into account in the polynucleotide.
- a GAP program can be defined as the total number of symbols in the shorter of the 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.
- Another aspect of the present application is to provide a polynucleotide encoding the variant polypeptide of the present application.
- polynucleotide refers to a DNA or RNA strand of a certain length or longer as a polymer of nucleotides in which nucleotide monomers are connected in a long chain form by covalent bonds, and more specifically, the mutant protein It refers to a polynucleotide fragment that encodes.
- the polynucleotide encoding the variant polypeptide of the present application is SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or SEQ ID NO: 12 or SEQ ID NO: 14 or SEQ ID NO: 38 or SEQ ID NO: 40 or SEQ ID NO: 42 or SEQ ID NO: 44 or the sequence It may include, but is not limited to, a nucleotide sequence encoding an amino acid sequence set forth in No. 46 or SEQ ID NO: 48 or SEQ ID NO: 50 or SEQ ID NO: 52.
- polynucleotide of the present application is SEQ ID NO: 7 or SEQ ID NO: 9 or SEQ ID NO: 11 or SEQ ID NO: 13 or SEQ ID NO: 15 or SEQ ID NO: 39 or SEQ ID NO: 41 or SEQ ID NO: 43 or SEQ ID NO: 45 or SEQ ID NO: 47 or SEQ ID NO: It may have or include the nucleotide sequence of No. 49 or SEQ ID NO: 51 or SEQ ID NO: 53.
- it may consist of a nucleotide sequence having 80% or more, 90% or more, 95% or more, 96% or more, 97% or more, 98% or more, and less than 100% homology or identity to SEQ ID NO: 53, but is not limited thereto.
- polynucleotide of the present application may be included without limitation as long as it can hybridize 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 polynucleotide sequence of the present application.
- stringent condition means a condition that enables specific hybridization between polynucleotides. These conditions are described in J. Sambrook et al., Molecular Cloning, A Laboratory Manual, 2nd Edition, Cold Spring Harbor Laboratory press, Cold Spring Harbor, New York, 1989; F.M. Ausubel et al., Current Protocols in Molecular Biology, John Wiley & Sons, Inc., New York, 9.50-9.51, 11.7-11.8).
- polynucleotides with high homology or identity 70% or more, 75% or more, 80% or more, 85% or more, 90% or more, 95% or more, 96% or more, 97% or more, 98% or more, or a condition in which polynucleotides having 99% or more homology or identity hybridize with each other and polynucleotides with lower homology or identity do not hybridize, or a washing condition of conventional Southern hybridization at 60°C, 1XSSC, 0.1% SDS, specifically 60°C, 0.1XSSC, 0.1% SDS, more specifically 68°C, 0.1XSSC, 0.1% SDS at a salt concentration and temperature equivalent to one wash, specifically two to three washes conditions can be enumerated.
- Hybridization requires that two nucleic acids have complementary sequences, although mismatch between bases is possible depending on the stringency of hybridization.
- complementary is used to describe the relationship between nucleotide bases capable of hybridizing to each other.
- adenine is complementary to thymine
- cytosine is complementary to guanine.
- the polynucleotides of the present application may also include isolated nucleic acid fragments that are complementary to the overall sequence as well as substantially similar nucleotide sequences.
- a polynucleotide having homology or identity to the polynucleotide of the present application can be detected using the hybridization conditions including a hybridization step at a Tm value of 55° C. and using the above-described conditions.
- 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.
- the appropriate stringency for hybridizing the polynucleotides depends on the length of the polynucleotides and the degree of complementarity, and the parameters are well known in the art (eg, J. Sambrook et al., supra).
- the polynucleotide of the present application may include SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or SEQ ID NO: 12 or SEQ ID NO: 14 or SEQ ID NO: 38 or SEQ ID NO: 40 or SEQ ID NO: 42 or SEQ ID NO: 44 or SEQ ID NO: 46 or sequence Any sequence encoding the amino acid sequence of SEQ ID NO: 48 or SEQ ID NO: 50 or SEQ ID NO: 52 may be included without limitation.
- the variant polypeptide is as described in the other aspects above.
- Another aspect of the present application is to provide a vector comprising the polynucleotide of the present application.
- the vector of the present application refers to a DNA preparation containing the base sequence of a polynucleotide encoding the target polypeptide operably linked to a suitable expression control region (or expression control sequence) so that the target polypeptide can be expressed in a suitable host.
- the expression control region 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.
- the vector 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.
- 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.
- pWE15, M13, MBL3, MBL4, IXII, ASHII, APII, t10, t11, Charon4A, and Charon21A may be used as phage vectors or cosmid vectors
- pBR-based, pUC-based, and pBluescriptII-based plasmid vectors may be used as plasmid vectors.
- pGEM-based, pTZ-based, pCL-based, pET-based and the like can be used.
- pDCM2 WO WO2021-187781 A1
- pACYC177, pACYC184, pCL, pECCG117, pUC19, pBR322, pMW118, pCC1BAC vector and the like can be used.
- a polynucleotide encoding a target polypeptide may be inserted into a chromosome through a vector for intracellular chromosome insertion.
- the insertion of the polynucleotide into the 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 determine whether a target nucleic acid molecule is inserted, and selectable phenotypes such as drug resistance, auxotrophy, resistance to cytotoxic agents, or surface polypeptide expression. Markers to be given can 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.
- the term "transformation” refers to introducing a vector including a polynucleotide encoding a target protein into a host cell or microorganism 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.
- the polynucleotide includes DNA and RNA encoding a target protein.
- the polynucleotide may be introduced in any form as long as it can be introduced and expressed into a host cell.
- 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.
- 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.
- operably linked means that a promoter sequence that initiates and mediates transcription of a polynucleotide encoding the target variant protein of the present application and the gene sequence are functionally linked.
- the polynucleotide is as described in the other aspects above.
- Another aspect of the present application is a variant polypeptide of the present application; a polynucleotide encoding it; Or a vector comprising the same; to provide a microorganism containing, L- leucine-producing Corynebacterium ( The genus of Corynebacterium ).
- microorganism includes both wild-type microorganisms and microorganisms in which genetic modification has occurred naturally or artificially, and a specific mechanism is As a weakened or enhanced microorganism, it may be a microorganism comprising genetic modification for the production of a desired polypeptide, protein or product.
- the microorganism of the present application includes a microorganism comprising any one or more of a mutant of the present application, a polynucleotide of the present application, and a vector including the polynucleotide of the present application; a microorganism modified to express a variant of the present application or a polynucleotide of the present application; a microorganism (eg, a recombinant strain) expressing a variant of the present application, or a polynucleotide of the present application; Or it may be a microorganism (eg, a recombinant strain) having the mutant activity of the present application, but is not limited thereto.
- the microorganism of the present application is a microorganism having isopropylmalate synthase activity or L-leucine-producing ability naturally, or a parent strain without isopropylmalate synthase activity or L-leucine-producing ability. It may be a microorganism that is expressed or L-leucine-producing ability is imparted, but is not limited thereto.
- the microorganism of the present application is a cell or microorganism that is transformed with a vector containing a gene encoding the polynucleotide of the present application or the variant polypeptide of the present application, and expresses the variant polypeptide of the present application, for the purpose of the present application Phase
- the microorganism of the present application may include all microorganisms capable of producing L-leucine, including the variant polypeptide of the present application.
- the microorganism of the present application expresses the mutant polypeptide of the present application by introducing a polynucleotide encoding the mutant polypeptide of the present application into a natural wild-type microorganism or a microorganism producing L-leucine, thereby producing L-leucine It may be a recombinant microorganism with increased activity.
- the recombinant microorganism having an increased ability to produce L-leucine may be a microorganism having an increased ability to produce L-leucine compared to a natural wild-type microorganism or an unmodified microorganism, but is not limited thereto.
- the term "unmodified microorganism” does not exclude a strain containing a mutation that can occur naturally in a microorganism, it is a wild-type strain or a natural-type strain itself, or a genetic variation caused by natural or artificial factors. It may mean the strain before being changed.
- the unmodified microorganism may refer to a strain in which the protein variant described herein has not been introduced or has been introduced.
- the "unmodified microorganism” may be used interchangeably with "strain before modification", “microbe before modification”, “unmodified strain”, “unmodified strain”, “unmodified microorganism” or "reference microorganism”.
- the microorganism of the present application is Corynebacterium glutamicum ( Corynebacterium glutamicum ), Corynebacterium crudilactis ( Corynebacterium crudilactis ), Corynebacterium deserti ( Corynebacterium deserti ), Corynebacterium ipish Ens ( Corynebacterium efficiens ), Corynebacterium callunae , Corynebacterium stationis , Corynebacterium singulare ), Corynebacterium halotolerans ( Corynebacterium halotolerans ) ), Corynebacterium striatum ( Corynebacterium striatum ), Corynebacterium ammoniagenes ), Corynebacterium pollutisoli ( Corynebacterium pollutisoli ), Corynebacterium imitans ( Corynebacterium imitans ), Coryne Bacterium testudin
- the microorganism of the present application is i) 138 th, ii) 162 th, iii) 211 th, iv) 245 th, or v) 588 th , may be a microorganism comprising a nucleotide sequence encoding isopropyl malate synthase in which one or more amino acid residues are substituted with other amino acids, specifically, the substitution is (1) the leuA gene encoding isopropyl malate synthase Mutation in which the 1673th nucleotide, G, is substituted with A, and arginine, the 558th amino acid of the LeuA protein, is substituted with histidine (R558H), (2) GC, which is the 1682th and 1683th nucleotides of the leuA gene, is replaced with AT Either mutation (G561D) in
- the microorganism producing L-leucine of the present application may be a microorganism in which isopropyl malate synthase activity is enhanced as it expresses isopropyl malate synthase including the above mutation.
- the term "enhancement" of a polypeptide activity means that the activity of the polypeptide is increased compared to the intrinsic activity.
- the reinforcement may be used interchangeably with terms such as up-regulation, overexpression, and increase.
- the increase may include both exhibiting an activity that it did not originally have, or exhibiting an improved activity compared to intrinsic activity or activity before modification.
- the "intrinsic activity” refers to the activity of a specific polypeptide originally possessed by the parent strain or unmodified microorganism before the transformation when the trait is changed due to genetic mutation caused by natural or artificial factors. This may be used interchangeably with "activity before modification”.
- “Enhancement” or “increase” in the activity of a polypeptide compared to the intrinsic activity means that the activity of the specific polypeptide is improved compared to the original activity of the parent strain or the unmodified microorganism before transformation.
- the enhancement can be achieved by introducing an exogenous polypeptide or by enhancing the activity of an endogenous polypeptide. Whether or not the activity of the polypeptide is enhanced can be confirmed from the increase in the level of activity, expression level, or the amount of product excreted from the polypeptide.
- the enhancement of the activity of the polypeptide can be applied by various methods well known in the art, and is not limited as long as it can enhance the activity of the target polypeptide compared to the microorganism before modification. Specifically, it may be one using genetic engineering and/or protein engineering well known to those skilled in the art, which is a routine method of molecular biology, but is not limited thereto (eg, Sitnicka et al. Functional Analysis of Genes. Advances in Cell). Biology 2010, Vol. 2. 1-16, Sambrook et al. Molecular Cloning 2012, etc.).
- the increase in the intracellular copy number of the polynucleotide encoding the polypeptide may be the introduction of a vector capable of replicating and functioning independently of the host to which the polynucleotide encoding the polypeptide is operably linked into the host cell. .
- one or more copies of the polynucleotide encoding the polypeptide may be introduced into a chromosome in a host cell.
- the introduction into the chromosome may be performed by introducing a vector capable of inserting the polynucleotide into the chromosome in the host cell into the host cell, but is not limited thereto.
- the vector is the same as described above.
- Replacing the gene expression control region (or expression control sequence) on the chromosome encoding the polypeptide with a sequence with strong activity is, for example, deletion, insertion, non-conservative or Conservative substitution or a combination thereof may result in a mutation in the sequence, or replacement with a sequence having a stronger activity.
- the expression control region is not particularly limited thereto, but may include a promoter, an operator sequence, a sequence encoding a ribosome binding site, and a sequence controlling the termination of transcription and translation.
- the original promoter may be replaced with a strong promoter, but is not limited thereto.
- Examples of known strong promoters include cj1 to cj7 promoter (US Pat. No. 7662943 B2), lac promoter, trp promoter, trc promoter, tac promoter, lambda phage PR promoter, PL promoter, tet promoter, gapA promoter, SPL7 promoter, SPL13 (sm3) promoter (US Patent US 10584338 B2), O2 promoter (US Patent US 10273491 B2), tkt promoter and yccA promoter, but are not limited thereto.
- the modification of the base sequence of the start codon or 5'-UTR region of the gene encoding the polypeptide may be, for example, substitution with another start codon having a higher polypeptide expression rate than the intrinsic start codon, but is not limited thereto. does not
- the amino acid sequence of the polypeptide or the polynucleotide sequence encoding the polypeptide is deleted, inserted, non-conservative or conservative to enhance the activity of the polypeptide.
- substitution or a combination thereof may result in a mutation in sequence, or replacement with an amino acid sequence or polynucleotide sequence improved to have stronger activity, or an amino acid sequence or polynucleotide sequence improved to increase activity, but is not limited thereto .
- the replacement may be specifically performed by inserting a polynucleotide into a chromosome by homologous recombination, but is not limited thereto.
- the vector used may further include a selection marker for confirming whether or not the chromosome is inserted. The selection marker is the same as described above.
- the introduction of the foreign polynucleotide exhibiting the activity of the polypeptide may be the introduction of the foreign polynucleotide encoding the polypeptide exhibiting the same/similar activity as the polypeptide into a host cell.
- the foreign polynucleotide is not limited in its origin or sequence as long as it exhibits the same/similar activity as the polypeptide.
- the method used for the introduction can be performed by appropriately selecting a known transformation method by those skilled in the art, and the introduced polynucleotide is expressed in a host cell to generate a polypeptide and increase its activity.
- Codon optimization of the polynucleotide encoding the polypeptide is codon-optimized so that the transcription or translation of the endogenous polynucleotide is increased in the host cell, or the transcription and translation of the foreign polynucleotide is optimized in the host cell. It may be that its codons are optimized so that the
- the tertiary structure of the polypeptide is analyzed and the exposed site is selected and modified or chemically modified, for example, by comparing the sequence information of the polypeptide to be analyzed with a database in which sequence information of known proteins is stored. It may be to determine a template protein candidate according to the degree, check the structure based on this, and select an exposed site to be modified or chemically modified and modified or modified.
- Such enhancement of polypeptide activity may be that the activity or concentration of the corresponding polypeptide is increased relative to the activity or concentration of the polypeptide expressed in the wild-type or pre-modified microbial strain, or the amount of product produced from the polypeptide may be increased.
- the present invention is not limited thereto.
- Modification of some or all of the polynucleotide in the microorganism of the present application is (a) homologous recombination using a vector for chromosome insertion in the microorganism or engineered nuclease (e.g., CRISPR) -Cas9) and/or (b) induced by light and/or chemical treatment such as ultraviolet and radiation, but not limited thereto.
- the method for modifying part or all of the gene may include a method by DNA recombination technology.
- a part or all of the gene may be deleted.
- the injected nucleotide sequence or vector may include a dominant selection marker, but is not limited thereto.
- the microorganism producing L-leucine of the present application is SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or SEQ ID NO: 12 or SEQ ID NO: 14 or SEQ ID NO: 38 or SEQ ID NO: 40 or SEQ ID NO: 42 or SEQ ID NO: 44 or a polypeptide comprising SEQ ID NO: 46 or SEQ ID NO: 48 or SEQ ID NO: 50 or SEQ ID NO: 52, SEQ ID NO: 6 or SEQ ID NO: 8 or SEQ ID NO: 10 or SEQ ID NO: 12 or SEQ ID NO: 14 or SEQ ID NO: 38 or SEQ ID NO: 40 or sequence SEQ ID NO: 42 or SEQ ID NO: 44 or SEQ ID NO: 46 or SEQ ID NO: 48 or SEQ ID NO: 50 or SEQ ID NO: 52 or a polynucleotide encoding a polypeptide comprising SEQ ID NO: 7 or SEQ ID NO: 9 or SEQ ID NO: 11 or SEQ ID NO: 13
- variant polypeptides, polynucleotides, vectors, L-leucine, and the like are as described in the other aspects above.
- Another aspect of the present application is a variant polypeptide of the present application; a polynucleotide encoding it; Or a vector comprising the same; provides a method for producing L- leucine, comprising the step of culturing a microorganism of the genus Corynebacterium that produces L- leucine in a medium.
- the term "cultivation” means growing the Corynebacterium sp. strain of the present application under moderately controlled environmental conditions.
- the culture process of the present application may be performed according to a suitable medium and culture conditions known in the art. Such a culture process can be easily adjusted and used by those skilled in the art according to the selected strain. Specifically, the culture may be batch, continuous, and fed-batch, but is not limited thereto.
- the term "medium” refers to a material in which nutrients required for culturing the Corynebacterium sp. strain of the present application are mixed as a main component, and includes water essential for survival and development, as well as nutrients and development. supplies, etc.
- any medium and other culture conditions used for culturing the Corynebacterium glutamicum strain of the present application may be used without any particular limitation as long as it is a medium used for culturing conventional microorganisms, but the Corynebacterium glutamicum of the present application Lium glutamicum strain can be cultured while controlling the temperature, pH, etc.
- the carbon source includes carbohydrates such as glucose, saccharose, lactose, fructose, sucrose, maltose, and the like; sugar alcohols such as mannitol and sorbitol; organic acids such as pyruvic acid, lactic acid, citric acid and the like; amino acids such as glutamic acid, methionine, lysine, and the like may be included.
- natural organic nutrient sources such as starch hydrolyzate, molasses, blackstrap molasses, rice winter, cassava, sugar cane offal and corn steep liquor can be used, specifically glucose and sterilized pre-treated molasses (i.e., converted to reducing sugar). molasses) may be used, and other appropriate amounts of carbon sources may be variously used without limitation. These carbon sources may be used alone or in combination of two or more, but is not limited thereto.
- nitrogen source examples include inorganic nitrogen sources such as ammonia, ammonium sulfate, ammonium chloride, ammonium acetate, ammonium phosphate, anmonium carbonate, and ammonium nitrate; Amino acids such as glutamic acid, methionine, glutamine, and organic nitrogen sources such as peptone, NZ-amine, meat extract, yeast extract, malt extract, corn steep liquor, casein hydrolyzate, fish or degradation products thereof, defatted soybean cake or degradation products thereof, etc. can be used These nitrogen sources may be used alone or in combination of two or more, but is not limited thereto.
- inorganic nitrogen sources such as ammonia, ammonium sulfate, ammonium chloride, ammonium acetate, ammonium phosphate, anmonium carbonate, and ammonium nitrate
- Amino acids such as glutamic acid, methionine, glutamine
- organic nitrogen sources such as peptone, NZ-amine, meat extract, yeast extract
- the phosphorus may include potassium first potassium phosphate, second potassium phosphate, or a sodium-containing salt corresponding thereto.
- potassium first potassium phosphate potassium phosphate
- second potassium phosphate or a sodium-containing salt corresponding thereto.
- sodium chloride, calcium chloride, iron chloride, magnesium sulfate, iron sulfate, manganese sulfate, calcium carbonate, etc. may be used, and in addition, amino acids, vitamins and/or suitable precursors may be included. These components or precursors may be added to the medium either batchwise or continuously. However, the present invention is not limited thereto.
- compounds such as ammonium hydroxide, potassium hydroxide, ammonia, phosphoric acid, sulfuric acid, etc. may be added to the medium in an appropriate manner to adjust the pH of the medium.
- an antifoaming agent such as fatty acid polyglycol ester may be used to suppress bubble formation.
- oxygen or oxygen-containing gas may be injected into the medium, or nitrogen, hydrogen or carbon dioxide gas may be injected without or without gas to maintain anaerobic and microaerobic conditions, it is not
- the culture temperature may be maintained at 20 to 45° C., specifically, 25 to 40° C., and may be cultured for about 10 to 160 hours, but is not limited thereto.
- L-leucine produced by the culturing of the present application may be secreted into the medium or remaining in cells.
- the L-leucine production method of the present application may further include preparing a Corynebacterium glutamicum strain of the present application or preparing a medium for culturing the strain.
- the method for producing L-leucine of the present application may further include recovering L-leucine from the medium according to the culture or the Corynebacterium glutamicum strain of the present application.
- the recovery may be to collect the desired L-leucine using a suitable method known in the art according to the culture method of the microorganism of the present application, for example, a batch, continuous or fed-batch culture method, etc. .
- a suitable method known in the art for example, centrifugation, filtration, treatment with a crystallized protein precipitating agent (salting out method), extraction, ultrasonic disruption, ultrafiltration, dialysis, molecular sieve chromatography (gel filtration), adsorption chromatography, ion exchange chromatography, affinity
- a suitable method known in the art may be used to recover the desired L-leucine from the medium or microorganism.
- the L-leucine production method of the present application may include an additional purification step.
- the purification may be performed using a suitable method known in the art.
- the recovery step and the purification step are performed continuously or discontinuously, regardless of the order, or integrated into one step. may be performed, but is not limited thereto.
- variant polypeptides, polynucleotides, L-leucine, and the like are as described in the other aspects above.
- Corynebacterium glutamicum strain comprising a variant polypeptide of the present application or a polynucleotide of the present application; Or to provide a composition for the production of L- leucine comprising; or a culture medium thereof.
- composition of the present application may further include any suitable excipients commonly used in compositions for the production of amino acids, and these excipients may be, for example, preservatives, wetting agents, dispersing agents, suspending agents, buffering agents, stabilizing agents or isotonic agents, etc.
- excipients commonly used in compositions for the production of amino acids
- these excipients may be, for example, preservatives, wetting agents, dispersing agents, suspending agents, buffering agents, stabilizing agents or isotonic agents, etc.
- the present invention is not limited thereto.
- variant polypeptides in the composition of the present application, variant polypeptides, polynucleotides, L-leucine, and the like are as described in the other aspects above.
- Example 1 Construction of a DNA library encoding a mutated isopropylmalate synthase
- a recombinant vector containing leuA was first prepared.
- SEQ ID NO: 2 encoding the LeuA protein (SEQ ID NO: 1, Uniprot accession code: P42455) derived from wild-type Corynebacterium glutamicum , Corynebacterium glutamicum ATCC13032
- primers of SEQ ID NOs: 3 and 4 were denatured at 94 ° C. for 1 minute, combined at 58 ° C. for 30 seconds, and polymerization using Pfu DNA polymerase at 72 ° C. for 1 minute was repeated 25 times to perform PCR.
- the sequences of the primers used are shown in Table 1 below.
- the PCR product was cloned into E. coli vector pCR2.1 using the TOPO cloning kit (Invitrogen) to obtain 'pCR-leuA'.
- an error-prone PCR kit (error-prone PCR kit, clontech Diversify® PCR Random Mutagenesis Kit) was used to prepare a leuA mutation library.
- a PCR reaction was performed using the primers of SEQ ID NO: 3 and SEQ ID NO: 4 listed in Table 1 under conditions in which 0 to 3 mutations per 1000 bp can occur.
- PCR was performed by repeating 25 times of pre-heating at 94° C. for 30 seconds, denaturation at 94° C. for 30 seconds, and polymerization at 68° C. for 1 minute and 30 seconds.
- the PCR product obtained at this time was denatured at 95 °C for 50 seconds using a megaprimer (50 ⁇ 125ng), combined at 60 °C for 50 seconds, and polymerized for 12 minutes at 68 °C 25 times repeated 25 times, followed by DpnI treatment, E. coli DH5 ⁇ was transformed through heat shock and spread on LB solid medium containing 25 mg/L of kanamycin. After selecting 20 transformed colonies, plasmids were obtained and nucleotide sequences were analyzed.
- Fermentation potency was evaluated in the following manner for each colony in order to identify colonies in which L-leucine production was increased and L-phenylalanine production among aromatic amino acids was increased and decreased among the 10,000 secured colonies.
- Badge type ingredient production medium Glucose 100g, (NH 4 ) 2 SO 4 40g, Soy Protein 2.5g, Corn Steep Solids 5g, Urea 3g, KH 2 PO 4 1g, MgSO 4 7H 2 O 0.5g, Biotin 100 ⁇ g, thiamine hydrochloride 1,000 ⁇ g, calcium-pantothenic acid 2000 ⁇ g, nicotinamide 3,000 ⁇ g, CaCO 3 30g; (based on 1 liter of distilled water), pH 7.0 nutrient medium Glucose 10g, broth 5g, polypeptone 10g, sodium chloride 2.5g, yeast extract 5g, agar 20g, urea 2g (based on 1 liter of distilled water)
- Each colony was inoculated into a 250 ml corner-barpool flask containing 25 ug/ml of kanamycin in 25 ml of the production medium of Table 2 using platinum, and then cultured with shaking at 30 ° C. for 60 hours at 200 rpm. After completion of the culture, L-leucine production was measured by a method using high-performance liquid chromatography (HPLC, SHIMAZDU LC20A).
- Corynebacterium glutamicum ATCC13032/pTOPO_leuA(mt)3847 having a mutation in the leuA gene has about 1.41 times the L-leucine production capacity compared to the parent strain, Corynebacterium glutamicum ATCC13032. improvement was confirmed.
- ATCC13032/pTOPO_leuA(mt)4708, ATCC13032/pTOPO_leuA(mt)5109, ATCC13032/pTOPO_leuA(mt)7563, ATCC13032/pTOPO_leuA(mt)8459 compared to the parent strain are about 1.45, 1.59, 1.36, respectively. improvement was confirmed.
- TCC which is nucleotides 631-633 of the leuA gene
- CTT CTT
- the ATCC13032/pTOPO_leuA(mt)7563 strain confirmed that AT, which is the 1762th-1763th nucleotides of the leuA gene, was substituted with CC.
- This is the 588th of the LeuA protein (the 553th in the case of based on the known literature that the LeuA protein consists of 581 amino acids (SEQ ID NO: 5) by writing the translation initiation codon behind 35; hereafter, only the 588th) amino acid
- isoleucine can encode a proline-substituted variant (hereinafter, I588P).
- the amino acid sequence of the LeuA variant (I588P) and the nucleotide sequence of the leuA variant encoding it are the same as SEQ ID NO: 12 and SEQ ID NO: 13.
- the vector for leuA (L138G, H162E, S211L, N245S, I588P) mutation was prepared using a site directed mutagenesis method. Specifically, using the primer pair of SEQ ID NO: 16 and SEQ ID NO: 17, the primer pair of SEQ ID NO: 18 and SEQ ID NO: 19 to generate L138G mutation using the chromosome of the wild-type Corynebacterium glutamicum ATCC13032 strain as a template, H162E PCR was performed using the primer pair of SEQ ID NO: 16 and SEQ ID NO: 20, and the primer pair of SEQ ID NO: 19 and SEQ ID NO: 21 to generate mutations.
- the primer pair of SEQ ID NO: 16 and SEQ ID NO: 22, the primer pair of SEQ ID NO: 19 and SEQ ID NO: 23 were used to generate the S211L mutation, and the primer pair of SEQ ID NO: 16 and SEQ ID NO: 24, SEQ ID NO: 24 to generate the N245S mutation.
- PCR was performed using the primer pair of 19 and SEQ ID NO: 25.
- PCR was performed using the primer pair of SEQ ID NO: 16 and SEQ ID NO: 26, and the primer pair of SEQ ID NO: 19 and SEQ ID NO: 27 to generate the I588P mutation.
- vectors 'pDCM2-leuA(S211L, I588P), pDCM2-leuA(L138G, H162E, S211L, N245S)', 'pDCM2-leuA(L138G, H162E, S211L, N245S), I588P)' was manufactured.
- pDCM2-leuA (L138G), pDCM2-leuA (H162E), pDCM2-leuA (S211L), pDCM2-leuA (N245S), pDCM2-leuA (I588P), pDCM2-leuA (S211L, I588P), pDCM2-leuA (L138G, H162E, S211L, N245S), pDCM2-leuA (L138G, H162E, S211L, N245S, I588P) vectors were transformed into Corynebacterium glutamicum ATCC13032 strains by electroporation and phase The strain into which the vector was inserted into the chromosome by recombination of the homologous sequence was selected in a medium containing 25 mg/L of kanamycin.
- the selected primary strain was again subjected to secondary crossover, and a strain into which the mutation of the target gene was introduced was selected. Finally, whether the leuA gene mutation was introduced into the transformed strain was confirmed that the mutation was introduced in the strain by performing PCR using the primers of SEQ ID NO: 3 and SEQ ID NO: 4 and then analyzing the nucleotide sequence.
- strains produced each of which is 'ATCC13032_leuA_L138G', 'ATCC13032_leuA_H162E, ATCC13032_leuA_S211L', 'ATCC13032_leuA_N245S', 'ATCC13032_leuA_I588P', 'ATCC13032_leuA_I588P', 'ATCC' ATCC13032_leuA_(L138G, H162E, S211L, N245S, I588P)' was named.
- Flask fermentation titer was evaluated to evaluate the L-leucine-producing ability of the 8 strains prepared above.
- ATCC13032_leuA_L138G with L138G mutation in the leuA gene improved the yield of L-leucine by about 1.45 times compared to the parent strain, Corynebacterium glutamicum ATCC13032, and ATCC13032_leuA_H162E with H162E mutation was the parent strain.
- the yield of L-leucine was improved by about 1.49 times, and ATCC13032_leuA_S211L with S211L mutation had an L-leucine yield of about 1.58 compared to the parent strain, Corynebacterium glutamicum ATCC13032.
- ATCC13032_leuA_N245S with N245S mutation improved the yield of L-leucine by about 1.40 times compared to the parent strain, Corynebacterium glutamicum ATCC13032, and ATCC13032_leuA_I588P with I588P mutation was the parent strain, Corynebacterium glutamicum. Compared to Qom ATCC13032, the yield of L-leucine was improved by about 1.37 times, and in ATCC13032_leuA_(S211L, I588P), the yield of L-leucine, the parent strain, was improved by about 1.51 times.
- ATCC13032_leuA_(L138G, H162E, S211L, N245S) and ATCC13032_leuA_(L138G, H162E, S211L, N245S, I588P) were confirmed that the yield of L-leucine was improved by about 1.56 times compared to the parent strain, Corynebacterium glutamicum.
- pDCM2-leuA (R558H, G561D) vector (US Patent Publication No. 2021-0254111) containing leuA gene mutations (R558H, G561D) was transformed into Corynebacterium glutamicum ATCC13032 by electroporation, and A strain into which the vector was inserted into the chromosome was selected by recombination of the homologous sequence in a medium containing 25 mg/L of kanamycin. The selected primary strain was again subjected to a secondary crossover, and a strain into which the leuA gene mutation was introduced was selected.
- An insertion vector was prepared to introduce a mutation (P247C) into the L-leucine-producing strain, CJL-8100.
- PCR was performed using a pair of primers of SEQ ID NOs: 28 and 29, and primers of SEQ ID NOs: 54 and 55 using the chromosome of the CJL-8100 strain as a template. After denaturation at 94 °C for 5 minutes, PCR was repeated 30 times for 30 seconds at 94 °C, 30 seconds at 55 °C, and 1 minute and 30 seconds at 72 °C, followed by polymerization at 72 °C for 5 minutes.
- the resultant PCR product was cloned by fusion of the homologous sequence of the terminal 15 bases between the DNA fragments using the linear pDCM2 vector digested with SmaI restriction enzyme and the In-Fusion enzyme, and the 558th amino acid in the LeuA amino acid sequence of the wild-type strain.
- Vector pDCM2 containing a leuA mutation encoding a LeuA variant in which arginine is substituted with histidine and glycine at position 561 is substituted with aspartic acid, and proline (Pro) at position 247 of LeuA is substituted with cysteine (Cys) -leuA (P247C, R558H, G561D) was prepared.
- the pDCM2-leuA (P247C, R558H, G561D) vector was transformed into wild-type Corynebacterium glutamicum ATCC13032 by electroporation and on the chromosome by recombination of the homologous sequence in a medium containing 25 mg/L of kanamycin. A strain into which the vector was inserted was selected. The selected primary strain was again subjected to a secondary crossover, and a strain into which the leuA gene mutation was introduced was selected.
- the CA13-8105 was deposited with the Korea Microorganism Conservation Center, a trustee institution under the Budapest Treaty on April 29, 2020, and was given an accession number KCCM12709P.
- V156A ilvE mutant
- V156A a strain in which the ilvE mutant (V156A), which is a gene encoding branched-chain amino acid aminotransferase, was introduced (WO WO2021- 112469 A1).
- the pDCM2-ilvE (V156A) vector containing the above ilvE gene mutation was transformed into Corynebacterium glutamicum CJL-8100 by electroporation, and the homologous sequence was obtained in a medium containing 25 mg/L of kanamycin.
- a strain into which the vector was inserted into the chromosome by recombination was selected.
- the selected primary strain was again subjected to secondary crossover, and a strain into which the mutation of the ilvE gene was introduced was selected. Finally, whether the mutation was introduced into the transformed strain was determined by PCR using the primer pair of SEQ ID NO: 30 and SEQ ID NO: 31 in Table 7 (94 °C 5 min, 94 °C 30 sec/55 °C 30 sec/72 °C 90 sec. Repeat 30 times, 72 °C for 5 minutes) and analyze the nucleotide sequence to confirm that the V156A mutation was introduced.
- the strain transformed with the pDCM2-ilvE (V156A) vector was named 'CJL-8108'.
- a site directed mutagenesis method was used to construct a vector for introducing gltA(M312I) mutations.
- PCR was performed using the primers of Table 8 below using the chromosome of wild-type Corynebacterium glutamicum ATCC13032 as a template. After denaturation at 94 °C for 5 minutes, PCR was repeated 30 times for 30 seconds at 94 °C, 30 seconds at 55 °C, and 1 minute and 30 seconds at 72 °C, followed by polymerization at 72 °C for 5 minutes.
- the resultant gene fragment was cloned by linking the homologous sequence of the 15 bases at the ends between the DNA fragments using a linear pDCM2 vector digested with SmaI restriction enzyme and an In-Fusion enzyme.
- a vector pDCM2-gltA (M312I) was constructed.
- the pDCM2-gltA (M312I) vector containing the above gltA gene mutation was transformed into Corynebacterium glutamicum CJL-8108 by electroporation and recombination of the homologous sequence was performed in a medium containing 25 mg/L of kanamycin.
- a strain into which the vector was inserted on the chromosome was selected.
- the selected primary strain was again subjected to a secondary crossover, and a strain into which a mutation of the gltA gene was introduced was selected.
- Example 4-1 In order to introduce the mutations (L138G, H162E, S211L, N245S, I588P) selected in Example 2 into CJL-8109, the L-leucine-producing strain prepared in Example 4-1, an insertion vector was prepared.
- PCR was performed using the chromosome of the CJL-8109 strain as a template and the primer pair in Table 4. PCR was performed by repeating 30 times of denaturation at 94 °C for 5 minutes, denaturation at 94 °C for 30 seconds, binding at 55 °C for 30 seconds, and polymerization at 72 °C for 1 minute and 30 seconds, followed by polymerization at 72 °C for 5 minutes.
- the resulting PCR product was cloned by fusion of the homologous sequence of the terminal 15 bases between the DNA fragments using the infusion enzyme and the pDCM2 vector on the line cut with SmaI restriction enzyme, and cloned into a total of 8 vectors 'pDCM2-leuA (L138G, P247C, R558H).
- the strain CJL-8109 an L-leucine-producing strain, was transformed with the vector prepared in Example 4-2, and the vector was inserted into the chromosome by recombination of the homologous sequence in a medium containing 25 mg/L of kanamycin. was selected. The selected primary strain was again subjected to secondary crossover, and a strain into which the mutation of the target gene was introduced was selected. Finally, whether the leuA gene mutation was introduced into the transformed strain was confirmed that the leuA mutation was introduced into the strain by performing PCR using the primers of SEQ ID NO: 3 and SEQ ID NO: 4 and then analyzing the nucleotide sequence. A total of 8 strains produced were named as shown in Table 11 below, and the amino acid sequence of the mutant containing the mutation and the nucleotide sequence of the leuA mutant encoding it were described in Table 10 below.
- strain name strain number SEQ ID NO: CJL-8109_leuA_L138G, P247C, R558H, G561D CJL-8117 SEQ ID NOs: 38, 39 CJL-8109_leuA_H162E, P247C, R558H, G561D CJL-8118 SEQ ID NOs: 40, 41 CJL-8109_leuA_S211L, P247C, R558H, G561D CA13-8119 SEQ ID NOs: 42, 43 CJL-8109_leuA_N245S, P247C, R558H, G561D CJL-8120 SEQ ID NOs: 44, 45 CJL-8109_leuA_I588P, P247C, R558H, G561D CJL-8121 SEQ ID NOs: 46, 47 CJL-8109_leuA_S211L, P247C, R558H, G561D, I588P
- wild-type Corynebacterium glutamicum ATCC13032 produced CJL-8109, CJL-8117, CJL-8118, CA13-8119, CJL-8120, CJL-8121, CJL-8122, CJL-8123, CJL-8125 strains of L-leucine production capacity was evaluated.
- flask culture was carried out in the method of Example 2-1, and after completion of the culture, the L-leucine production of the parent strain and the mutant strain was measured using HPLC, and the results are shown in Table 11 below.
- strain name L-leucine (g/L) ATCC13032 0.87 CJL-8109 2.89 CJL-8117 3.55 CJL-8118 3.67 CA13-8119 4.03 CJL-8120 3.46 CJL-8121 3.48 CJL-8122 4.52 CJL-8123 4.02 CJL-8125 4.01
- L-leucine with L138G, H162E, S211L, N245S, I588P, S211L/I588P, L138G/H162E/S211L/N245S or L138G/H162E/S211L/N245S/I588P mutations in the leuA gene were L compared to the parent strain, wild-type Corynebacterium glutamicum ATCC13032. - It was confirmed that the leucine production capacity was improved by about 4 to 5 times.
- L-leucine-producing strains Corynebacterium glutamicum CJL-8117, CJL-8118, CA13-8119, CJL-8120, CJL-8121, CJL-8122, CJL-8123, and CJL-8125 were Compared to Nebacterium glutamicum CJL-8109, it was confirmed that the L-leucine production ability was improved by about 1.2 to 1.6 times.
- amino acids at positions 138, 162, 211, 245, and 588 in the amino acid sequence of the LeuA protein are important positions for L-leucine production activity.
- the strains (CJL-8109, CJL-8117, CJL-8118, CA13-8119, CJL-8120, CJL-8121, CJL-8122, CJL -8123, CJL-8125) and wild-type Corynebacterium glutamicum ATCC13032 were inoculated with 1 platinum, respectively, and then cultured with shaking at 30° C. for 16 hours at 200 rpm. After completion of the culture, the culture medium was centrifuged, the supernatant was discarded, the pellet was washed and turbid with a lysis buffer solution, and the cells were disrupted. Protein quantification of the lysate followed the Bradford method, and a lysate containing 100 ⁇ g/ml of protein was used.
- strain Relative isopropylmalate synthase activity (%) ATCC13032 100 CJL-8109 118 CJL-8117 121 CJL-8118 125 CA13-8119 138 CJL-8120 122 CJL-8121 130 CJL-8122 132 CJL-8123 135 CJL-8125 136
- the L-leucine-producing strains CJL-8109 and CJL-8117, CJL-8118, CA13-8119, CJL-8120, CJL-8121, CJL-8122 transformed with the LeuA mutant expression vector , CJL-8123 and CJL-8125 confirmed that the activity of isopropyl malate synthase was improved by about 1.18 to 1.38 times compared to the control wild-type Corynebacterium glutamicum ATCC 13032.
- the L-leucine-producing strains maintained the isopropyl malate synthase enzyme activity at 83% to 93%, respectively, even under the condition in which 2 g/L of leucine was added, thereby confirming that feedback inhibition by leucine was released. .
- the CA13-8119 was deposited with the Korea Microorganism Conservation Center, a trustee institution under the Budapest Treaty on February 8, 2021, and was given an accession number KCCM12949P.
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Abstract
Description
서열번호 | 서열명 | 서열(5'->3') |
서열번호 3 | Primer 1 | TATGCTTCACCACATGACTTC |
서열번호 4 | Primer 2 | AAATCATTTGAGAAAACTCGAGG |
배지 종류 | 성분 |
생산배지 | 포도당 100g, (NH4)2SO4 40g, 대두 단백질(Soy Protein) 2.5g, 옥수수 침지 고형분(Corn Steep Solids) 5 g, 요소 3g, KH2PO4 1g, MgSO4·7H2O 0.5g, 바이오틴 100㎍, 티아민 염산염 1,000㎍, 칼슘-판토텐산 2000㎍, 니코틴아미드 3,000㎍, CaCO3 30g; (증류수 1리터 기준), pH 7.0 |
영양배지 | 포도당 10g, 육즙 5g, 폴리펩톤 10g, 염화나트륨 2.5g, 효모엑기스 5g, 한천 20g, 유레아 2g (증류수 1리터 기준) |
균주명 | L-류신 (g/L) |
ATCC13032 | 0.87 |
ATCC13032/pTOPO_leuA(mt)3847 | 1.23 |
ATCC13032/pTOPO_leuA(mt)4708 | 1.27 |
ATCC13032/pTOPO_leuA(mt)5109 | 1.39 |
ATCC13032/pTOPO_leuA(mt)7563 | 1.19 |
ATCC13032/pTOPO_leuA(mt)8459 | 1.25 |
서열번호 | 서열명 | 서열(5'->3') |
서열번호 16 | Primer 3 | GGTCGACTCTAGAGGATCCCCTATGCTTCACCACATGACTTC |
서열번호 17 | Primer 4 | CAGGTGCTCACGAGCCTGAACCccAACCTGAATGGTGACATC |
서열번호 18 | Primer 5 | GACGATGTCACCATTCAGGTTggGGTTCAGGCTCGTGAG |
서열번호 19 | Primer 6 | GTGAATTCGAGCTCGGTACCCAAATCATTTGAGAAAACTCGAGGC |
서열번호 20 | Primer 7 | GATGGAGGTTGAGTTGTAGAAcTcCACGATAACGTTTTTTGCG |
서열번호 21 | Primer 8 | GGCGCAAAAAACGTTATCGTGgAgTTCTACAACTCAACCTCC |
서열번호 22 | Primer 9 | AGTGCCGGTGAAGGACTCAGGaagGTACTGCCAGCGCC |
서열번호 23 | Primer 10 | ACCAACTGGCGCTGGCAGTACcttCCTGAGTCCTTCACC |
서열번호 24 | Primer 11 | CATCTCAACGGTGGAACACAGGgaGATGATCATTGGGTTCTC |
서열번호 25 | Primer 12 | CCTGAGAACCCAATGATCATCtcCCTGTGTTCCACCG |
서열번호 26 | Primer 13 | TGCCTTCAGCGAAGCGTAGGTGggGGAGCCAGCGATGC |
서열번호 27 | Primer 14 | GGCGTCGGCATCGCTGGCTCCccCACCTACGCTTCGCTG |
균주명 | 류신 (g/L) |
ATCC13032 | 0.87 |
ATCC13032_leuA_L138G | 1.27 |
ATCC13032_leuA_H162E | 1.30 |
ATCC13032_leuA_S211L | 1.38 |
ATCC13032_leuA_N245S | 1.22 |
ATCC13032_leuA_I588P | 1.20 |
ATCC13032_leuA_(S211L, I588P) | 1.32 |
ATCC13032_leuA_(L138G, H162E, S211L, N245S) | 1.36 |
ATCC13032_leuA_(L138G, H162E, S211L, N245S, I588P) | 1.35 |
서열번호 | 서열명 | 서열(5'->3') |
서열번호 28 | Primer 15 | AACACGACCGGCATCCCGTCGC |
서열번호 29 | Primer 16 | AAATCATTTGAGAAAACTCGAGG |
서열번호 19 | Primer 6 | GTGAATTCGAGCTCGGTACCCAAATCATTTGAGAAAACTCGAGGC |
서열번호 54 | Primer 27 | GGTGATCATCTCAACGGTGGAACACAGGTTGATGATCATTGGGTT |
서열번호 55 | Primer 28 | AACCCAATGATCATCAACCTGTGTTCCACCGTTGAGATGATCACC |
서열번호 | 서열명 | 서열(5'->3') |
서열번호 30 | Primer 23 | GTCACCCGATCGTCTGAAG |
서열번호 31 | Primer 24 | GTCTTAAAACCGGTTGAT |
서열번호 | 서열명 | 서열(5'->3') |
32 | gltA M312I Up F | GTGAATTCGAGCTCGGTACCCGCGGGAATCCTGCGTTACCGC |
33 | gltA M312I Up R | TGTAAACGCGGTGTCCGAAGCCGATGAGGCGGACGCCGTCTT |
34 | gltA M312I Down F | AAGACGGCGTCCGCCTCATCGGCTTCGGACACCGCGTTTACA |
35 | gltA M312I Down R | GGTCGACTCTAGAGGATCCCCTTAGCGCTCCTCGCGAGGAAC |
서열번호 | 서열명 | 서열(5'->3') |
서열번호 36 | Primer 25 | CAATGCTGGCTGCGTACGC |
서열번호 37 | Primer 26 | CTCCTCGCGAGGAACCAACT |
균주명 | 균주 번호 | 서열번호 |
CJL-8109_leuA_L138G, P247C, R558H, G561D | CJL-8117 | 서열번호 38, 39 |
CJL-8109_leuA_H162E, P247C, R558H, G561D | CJL-8118 | 서열번호 40, 41 |
CJL-8109_leuA_S211L, P247C, R558H, G561D | CA13-8119 | 서열번호 42, 43 |
CJL-8109_leuA_N245S, P247C, R558H, G561D | CJL-8120 | 서열번호 44, 45 |
CJL-8109_leuA_I588P, P247C, R558H, G561D | CJL-8121 | 서열번호 46, 47 |
CJL-8109_leuA_S211L, P247C, R558H, G561D, I588P | CJL-8122 | 서열번호 48, 49 |
CJL-8109_leuA_L138G, H162E, S211L, N245S, P247C, R558H, G561D | CJL-8123 | 서열번호 50, 51 |
CJL-8109_leuA_L138G, H162E, S211L, N245S, P247C, R558H, G561D, I588P | CJL-8125 | 서열번호 52, 53 |
균주명 | L-류신 (g/L) |
ATCC13032 | 0.87 |
CJL-8109 | 2.89 |
CJL-8117 | 3.55 |
CJL-8118 | 3.67 |
CA13-8119 | 4.03 |
CJL-8120 | 3.46 |
CJL-8121 | 3.48 |
CJL-8122 | 4.52 |
CJL-8123 | 4.02 |
CJL-8125 | 4.01 |
균주 | 상대적인 이소프로필말레이트 신타제 활성 (%) |
ATCC13032 | 100 |
CJL-8109 | 118 |
CJL-8117 | 121 |
CJL-8118 | 125 |
CA13-8119 | 138 |
CJL-8120 | 122 |
CJL-8121 | 130 |
CJL-8122 | 132 |
CJL-8123 | 135 |
CJL-8125 | 136 |
균주 | 류신 0 g/l | 류신 2 g/l |
상대적인 이소프로필말레이트 신타제 활성 (%) | ||
ATCC13032 | 100 | 36 |
CJL-8109 | 100 | 83 |
CJL-8117 | 100 | 83 |
CJL-8118 | 100 | 83 |
CA13-8119 | 100 | 93 |
CJL-8120 | 100 | 85 |
CJL-8121 | 100 | 88 |
CJL-8122 | 100 | 92 |
CJL-8123 | 100 | 90 |
CJL-8125 | 100 | 91 |
Claims (14)
- 서열번호 1의 아미노산 서열에서 i) 138 번째에 상응하는 위치의 아미노산 잔기가 다른 아미노산 잔기로 치환, ii) 162 번째에 상응하는 위치의 아미노산 잔기가 다른 아미노산 잔기로 치환, iii) 211 번째에 상응하는 위치의 아미노산 잔기가 다른 아미노산 잔기로 치환, iv) 245 번째에 상응하는 위치의 아미노산 잔기가 다른 아미노산 잔기로 치환, 및 v) 588 번째에 상응하는 위치의 아미노산 잔기가 다른 아미노산 잔기로의 치환으로 이루어지는 군으로부터 선택되는 어느 하나 이상의 치환을 포함하는, 이소프로필말레이트 신타제(isopropylmalate synthase) 활성을 가지는 변이형 폴리펩티드.
- 제1항에 있어서, 상기 i)은 138 번째에 상응하는 위치의 아미노산 잔기인 류신이 글라이신으로 치환된 것인, 변이형 폴리펩티드.
- 제1항에 있어서, 상기 ii)는 162 번째에 상응하는 위치의 아미노산 잔기인 히스티딘이 글루타메이트로 치환된 것인, 변이형 폴리펩티드.
- 제1항에 있어서, 상기 iii)은 211 번째에 상응하는 위치의 아미노산 잔기인 세린이 류신으로 치환된 것인, 변이형 폴리펩티드.
- 제1항에 있어서, 상기 iv)는 245 번째에 상응하는 위치의 아미노산 잔기인 아스파라기닌이 세린으로 치환된 것인, 변이형 폴리펩티드.
- 제1항에 있어서, 상기 v)는 588 번째에 상응하는 위치의 아미노산 잔기인 이소류신이 프롤린으로 치환된 것인, 변이형 폴리펩티드.
- 제1항에 있어서, 상기 변이형 폴리펩티드는 서열번호 6, 서열번호 8, 서열번호 10, 서열번호 12, 및 서열번호 14으로 이루어지는 군으로부터 선택되는 어느 하나 이상의 아미노산 서열을 포함하는 것인, 변이형 폴리펩티드.
- 제1항 내지 제7항 중 어느 한 항의 변이형 폴리펩티드를 코딩하는 폴리뉴클레오티드.
- 제8항의 폴리뉴클레오티드를 포함하는 벡터.
- 제1항의 변이형 폴리펩티드; 이를 코딩하는 폴리뉴클레오티드; 또는 이를 포함하는 벡터;를 포함하는, L-류신을 생산하는 코리네박테리움 속(The genus of Corynebacterium) 미생물.
- 제10항에 있어서, 상기 코리네박테리움 속 미생물은 코리네박테리움 글루타미쿰(Corynebacterium glutamicum)인, 코리네박테리움 속 미생물.
- 제1항의 변이형 폴리펩티드; 이를 코딩하는 폴리뉴클레오티드; 또는 이를 포함하는 벡터;를 포함하는, L-류신을 생산하는 코리네박테리움 속 미생물을 배지에서 배양하는 단계를 포함하는, L-류신 생산방법.
- 제12항에 있어서, 상기 배양하는 단계 이후 배지 또는 미생물로부터 L-류신을 회수하는 단계를 추가적으로 포함하는, L-류신 생산방법.
- 제1항의 변이형 폴리펩티드, 이를 코딩하는 폴리뉴클레오티드, 또는 이를 포함하는 벡터를 포함하는, L-류신을 생산하는 코리네박테리움 속 미생물; 또는 이를 배양한 배지;를 포함하는 L-류신 생산용 조성물.
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EP22763472.2A EP4253532A4 (en) | 2021-03-05 | 2022-01-28 | ISOPROPYLMALATE SYNTHASE VARIANT AND METHOD FOR PRODUCING L-LEUCINE USING THE SAME |
AU2022229156A AU2022229156A1 (en) | 2021-03-05 | 2022-01-28 | Isopropylmalate synthase variant and a method of producing L-leucine using the same |
JP2023540849A JP2024501753A (ja) | 2021-03-05 | 2022-01-28 | イソプロピルリンゴ酸シンターゼ変異体及びそれを用いたl-ロイシンの生産方法 |
CA3204875A CA3204875A1 (en) | 2021-03-05 | 2022-01-28 | Isopropylmalate synthase variant and a method of producing l-leucine using the same |
MX2023009553A MX2023009553A (es) | 2021-03-05 | 2022-01-28 | Variante de isopropilmalato sintasa y un procedimiento para producir l-leucina usando la misma. |
US18/274,912 US20240093252A1 (en) | 2021-03-05 | 2022-01-28 | Isopropylmalate synthase variant and a method of producing l-leucine using the same |
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- 2022-01-28 AU AU2022229156A patent/AU2022229156A1/en active Pending
- 2022-01-28 US US18/274,912 patent/US20240093252A1/en active Pending
- 2022-01-28 CN CN202280016563.2A patent/CN117355605A/zh active Pending
- 2022-01-28 WO PCT/KR2022/001560 patent/WO2022186487A1/ko active Application Filing
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AU2022229156A9 (en) | 2024-10-17 |
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KR20220125526A (ko) | 2022-09-14 |
AU2022229156A1 (en) | 2023-07-27 |
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