WO2004104202A1 - D-乳酸脱水素酵素活性を有するタンパク質をコードするdna及びその利用 - Google Patents
D-乳酸脱水素酵素活性を有するタンパク質をコードするdna及びその利用 Download PDFInfo
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- WO2004104202A1 WO2004104202A1 PCT/JP2004/007317 JP2004007317W WO2004104202A1 WO 2004104202 A1 WO2004104202 A1 WO 2004104202A1 JP 2004007317 W JP2004007317 W JP 2004007317W WO 2004104202 A1 WO2004104202 A1 WO 2004104202A1
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- 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
- C12N9/0004—Oxidoreductases (1.)
- C12N9/0006—Oxidoreductases (1.) acting on CH-OH groups as donors (1.1)
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- 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
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/40—Preparation of oxygen-containing organic compounds containing a carboxyl group including Peroxycarboxylic acids
- C12P7/56—Lactic acid
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- 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
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/62—Carboxylic acid esters
- C12P7/625—Polyesters of hydroxy carboxylic acids
Definitions
- the present invention relates to D-lactic acid and a technique for producing a polymer using D-lactic acid, and more particularly, to a protein having D-lactic acid dehydrogenase activity suitable for causing yeast to produce D-lactic acid, and a protein having the same.
- the present invention relates to a DNA having a nucleotide sequence encoding a protein and a field of using the same. book
- Lactic acid has two optical isomers, L-lactic acid and D-lactic acid.
- the technology for fermentative production of D-lactic acid includes fermentation by lactic acid bacteria that produce D-lactic acid using a medium containing brewer's yeast. It is known that it is produced in Japan (Patent Document 1).
- a method using Bulgarian lactobacilli is also known (Patent Document 2).
- a technique for obtaining D-lactic acid with high optical purity is also disclosed (Patent Documents 3, 4, and 5). These lactic acid-producing microorganisms have a low production rate and require a complicated medium composition, and thus are not suitable for industrial production.
- Patent Document 6 there is also a technique for producing lactic acid by using a recombinant strain in which a lactate dehydrogenase gene has been incorporated into a yeast lacking ethanol-producing ability or having relatively low ethanol-producing ability
- Patent Document 6 this technique only discloses production of L-lactic acid.
- a D-lactate dehydrogenase gene is introduced into yeast having a high pyruvate production ability to produce D-lactic acid (Patent Reference 7) Power This method focuses on the high pyruvate concentration in yeast having high pyruvate production ability, and does not indicate production in general yeast.
- Patent Document 1
- Patent Document 2
- Patent Document 5
- an object of the present invention is to provide a polynucleotide encoding a protein having lactate dehydrogenase activity and a protein which can be used for D-lactic acid production, and an excellent D-lactic acid using the polynucleotide.
- the present inventors have searched for D-lactate dehydrogenase and a gene that expresses the enzyme, and have found a transformation system that exhibits excellent D-lactic acid-producing ability. That is, a protein having D-lactate dehydrogenase activity, a DNA encoding the protein having the enzyme activity, and a transformant using the DNA, which can contribute to excellent D-lactic acid production, have been found.
- a method for producing D-lactic acid and a method for producing polylactic acid Based on these findings, the present invention provides the following means.
- substitution positions in the above table are shown as positions from methionine corresponding to the start codon.
- amino acid sequence shown in SEQ ID NO: 2 in the sequence listing the amino acid sequence comprises one or several amino acid substitutions, deletions, insertions, or additions, and D-lactic acid dehydrogenation A protein having enzymatic activity.
- a protein having an amino acid sequence containing at least the amino acid residues at positions 78 to 79, 152 to 175, 235, and 296 of the amino acid sequence of SEQ ID NO: 2 and having D-lactate dehydrogenase activity .
- a DNA segment having the DNA of (1) A DNA segment having a DNA encoding a promoter or a homolog of the promoter,
- a DNA construct comprising:
- the host is a microorganism selected from the group consisting of eukaryotic microorganisms including yeast and fungi, and lactic acid bacteria, Echerichia spp., And prokaryotic microorganisms including Bacillus spp.
- a method comprising:
- a method comprising:
- FIG. 1A is homology data of the nucleotide sequence of SEQ ID NO: 1 and the nucleotide sequence of SEQ ID NO: 3.
- FIG. 1B is a continuation of FIG. 1A, and is homology data of the nucleotide sequence of SEQ ID NO: 1 and the nucleotide sequence of SEQ ID NO: 3.
- FIG. 2 shows homology data of the amino acid sequence shown in SEQ ID NO: 2 and the amino acid sequence shown in SEQ ID NO: 4.
- FIG. 3 is a diagram showing a part of a step of constructing a pBTRP-PDC1-DLDHME vector.
- FIG. 4 is a diagram showing a part of a step of constructing a pBTRP-PDC1-DLDHME vector.
- FIG. 5 is a diagram showing a part of the step of constructing the pBTRP-PDCl-DLDHME vector.
- FIG. 6 is a diagram showing the final step of the construction step of the pBTRP-PDC1-DLDHME vector.
- FIG. 7 is a diagram showing a part of the chromosome structure of the diploid transformed yeast obtained in Example 3.
- FIG. 8 is a graph showing the results of the D-lactate (calcium salt) fermentation test of the parent strain and the chromosome-introduced transformant, showing the amounts of D-lactate and ethanol produced by each strain.
- Figure 9 is a graph showing the fermentation test results of free D-lactic acid of the parent strain, the chromosome-introduced transformant, and the self-replicating plasmid-type transformant. Indicates the amount.
- FIG. 4 is a graph showing the results of a fermentation test of free D-lactic acid in one introduced strain, showing the amounts of D-lactic acid and ethanol produced by each strain.
- the polynucleotide of the present invention has a base sequence encoding a protein having D-lactate dehydrogenase (D-LDH) activity.
- D-LDH D-lactate dehydrogenase
- a transformant expressing the present protein and a transformant producing D-lactic acid can be produced.
- D-lactic acid can be produced in an enzyme reaction system using a protein encoded by the polynucleotide of the present invention.
- a new source of D-lactic acid raw material can be provided. Further, according to these inventions, D-lactic acid can be produced with high selectivity or with high efficiency.
- the polynucleotide of the present invention can include any of the following.
- (b) Encodes a protein having a D-LDH activity that hybridizes under stringent conditions with a probe prepared from the entire nucleotide sequence of SEQ ID NO: 1 or a partial nucleotide sequence thereof or a complementary strand thereof. Polynucleotide.
- a protein consisting of the amino acid sequence of SEQ ID NO: 2 including substitution, deletion, insertion, or addition of one or several amino acids and having D-lactic acid dehydrogenase activity; The encoding polynucleotide.
- (g) has an amino acid sequence containing at least the amino acid residues at positions 78 to 79, 152 to 175, 235, and 296 of the amino acid sequence of SEQ ID NO: 2, and has D-lactate dehydrogenase activity
- a polynucleotide that encodes a protein has an amino acid sequence containing at least the amino acid residues at positions 78 to 79, 152 to 175, 235, and 296 of the amino acid sequence of SEQ ID NO: 2, and has D-lactate dehydrogenase activity A polynucleotide that encodes a protein.
- the polynucleotide having the nucleotide sequence of SEQ ID NO: 1 of the present invention encodes a protein having the amino acid sequence of SEQ ID NO: 2.
- the polynucleotide is derived from the lactic acid bacterium Leuconostoc mesenteroides. Specifically, the white stirrer is a Leuconostoc. Mesenteroi des IF03426 strain (a strain registered with the Fermentation Research Institute) ).
- This polynucleotide is different from the sequence registered in GenBank (GenBank ACCESSION No. L29327), and differs in a 27 bp base.
- the amino acid sequence to be coded (SEQ ID NO: 2) also differs from the amino acid sequence based on the registered nucleotide sequence (SEQ ID NO: 4) in 19 amino acid residues.
- the homology of the nucleotide sequence of SEQ ID NO: 1 to the nucleotide sequence of SEQ ID NO: 3 is 97.3%.
- the homology of the amino acid sequence shown in SEQ ID NO: 2 to the amino acid sequence shown in SEQ ID NO: 4 is 94.3%. Note that these morphologies are calculated based on (GENETYX-MAC (ver. 10.1) Software Development Co., Ltd.).
- the present invention relates to a polynucleotide encoding a protein having D-LDH activity.
- the polynucleotide may be a naturally-occurring polynucleotide such as DNA or RNA, or a polynucleotide containing an artificially synthesized nucleotide derivative. Further, it may be a single strand or a form having a complementary strand thereof.
- polynucleotide of the present invention is a polynucleotide having the nucleotide sequence of SEQ ID NO: 1.
- the polynucleotide set forth in SEQ ID NO: 1 is
- Another embodiment of the polynucleotide of the present invention is another polynucleotide encoding a protein having the amino acid sequence of SEQ ID NO: 2. This is because it is sufficient to have a nucleotide sequence encoding the amino acid sequence described in SEQ ID NO: 2. Further, still another embodiment of the polynucleotide of the present invention comprises, in the amino acid sequence of SEQ ID NO: 2, an amino acid sequence containing substitution, deletion, insertion, or addition of one or several amino acids, and , A polynucleotide having a base sequence encoding a protein having D-LDH activity.
- probes that can hybridize under stringent conditions are selected from one or more of at least 20, preferably at least 30, for example 40, 60 or 100 contiguous sequences listed in SEQ ID NO: 1. The DNA thus obtained can be used as a probe DNA.
- Polynucleotides that can hybridize with a DNA or probe consisting of the nucleotide sequence of SEQ ID NO: 1 under stringent conditions include those containing a nucleotide sequence similar to SEQ ID NO: 1. Such a polynucleotide is likely to encode a protein functionally equivalent to the protein consisting of the amino acid sequence of SEQ ID NO: 2.
- polynucleotide of the present invention comprises at least 70%, preferably at least 80%, more preferably at least 90%, more preferably at least 70% of the amino acid sequence of SEQ ID NO: 2. It encodes a protein that has 95% or more homology and has D-lactate dehydrogenase activity.
- the homology search of proteins can be performed using the gene angle analysis program BLAST (HYPERLINK http: // blast, genome, ad.jp http: // blast, genome. Ad.jp), FASTA (HYPERLINK http: / / fasta. genome.ad.jp/SIT/FASTA.html
- the polynucleotide of the present invention has an amino acid sequence having one or more substitutions selected from the amino acid residue substitution table in Table 1 in the amino acid sequence of SEQ ID NO: 4, -Encodes a protein with lactate dehydrogenase activity.
- the amino acid sequence set forth in SEQ ID NO: 4 is the D-LDH strain of Leuconostoc. Mesenteroides registered in GeneBank (GeneBank ACCESSION No. L29327).
- the amino acid sequence represented by SEQ ID NO: 2 has all the substitutions in the amino acid substitution table of Table 1 in the amino acid sequence represented by SEQ ID NO: 4, but does not have all of them. It is expected that a protein having D-LDH activity that can be used in the present invention can be obtained.
- the number of substitutions is 2 or more, more preferably 11 or more, and even more preferably 19 or more.
- amino acid residue substitution table of Table 1 it is preferable to have amino acid substitutions of substitution types 1 to 19. Also, more preferably, the substitution type
- polynucleotide of the present invention has an amino acid sequence of at least positions 78 to 79, 152 to 175, 235, and 296 in the amino acid sequence of SEQ ID NO: 2. It encodes a protein having D-LDH activity.
- the amino acid sequences at positions 78 to 79, 152 to 175, 235, and 296 are considered to be characteristic in the amino acid of SEQ ID NO: 2, include the amino acid sequence, and have D-LDH activity In such a case, it can be said that the polynucleotide is a preferable polynucleotide of the present invention.
- a histidine residue at position 296 as an active center and a port having an amino acid residue at positions 152 to 175 of a NADH binding site as a coenzyme are preferred.
- the polynucleotide is other than a polynucleotide consisting of the nucleotide sequence of SEQ ID NO: 1 or having the nucleotide sequence, it encodes a protein that functions equivalently to the protein encoded by the polynucleotide. Nucleotides are included in the polynucleotide of the present invention.
- the polynucleotide of the present invention can be obtained by any of the various methods described above, can also be chemically synthesized, or can be obtained from other organisms based on the nucleotide sequence of SEQ ID NO: 1 by PCR cloning, hybridization, etc. Can be obtained by For example, it can be isolated from proteins derived from prokaryotic organisms such as lactate bacteria, Escherichia coli, Bacillus subtilis, and fungi, or from eukaryotic organisms such as yeast and octopus.
- Fujimoto et al.'S method known as a method for synthesizing long-chain DNA (Fujimoto, Hideya, Synthetic Gene Preparation, Plant Cell Engineering Series 7 Plant PCR Experiment Protocol, 1997, Shujunsha, P95-100) Can also be adopted.
- the present invention can be used even if it is not a homologue of a polynucleotide consisting of the nucleotide sequence of SEQ ID NO: 1. This is because even with such a polynucleotide, the transformant of the present invention into which the polynucleotide has been introduced is useful for producing D-LDH and producing D-lactic acid.
- having the nucleotide sequence set forth in SEQ ID NO: 1 has D-LDH activity derived from prokaryotic organisms such as Escherichia coli, Bacillus subtilis, and Rhizobia, in addition to lactic acid bacteria, regardless of whether they are homologs or not.
- Polynucleotides encoding proteins or proteins having D-LDH activity derived from eukaryotes such as yeast and octopus can also be used. (protein)
- the protein of the present invention consists of or has the amino acid sequence of SEQ ID NO: 2. These proteins are a preferred embodiment of the present invention.
- another embodiment of the protein of the present invention is, as described above, an amino acid sequence containing one or several amino acid substitutions, deletions, insertions, or additions in the amino acid sequence of SEQ ID NO: 2. It is a protein consisting of a sequence and having D-LDH activity. Still another embodiment has at least 70%, preferably 80% or more, more preferably 90% or more, still more preferably 95% or more homology with the amino acid sequence of SEQ ID NO: 2, -A protein having LDH activity.
- Still another embodiment has an amino acid sequence having one or more substitutions selected from the amino acid substitution table of Table 1 in the amino acid sequence of SEQ ID NO: 4, It is a protein having LDH activity.
- the amino acid sequence IJ described in SEQ ID NO: 4 is a sequence of D-LDH of Leuconostoc. Mesenteroides registered in GeneBank (GeneBank ACCESSION No. L29327).
- the amino acid sequence set forth in SEQ ID NO: 2 has all the substitutions in the amino acid substitution table in the amino acid sequence set forth in SEQ ID NO: 4, but can be used in the present invention even if it does not have all of them. It is assumed that a protein having effective D-LDH activity can be obtained.
- the number of substitutions is 2 or more, more preferably 11 or more, and even more preferably 19 or more.
- the amino acid substitution preferably has substitution type 1 to 19 amino acid substitutions, and more preferably has substitution type 6 to 16 amino acid substitutions.
- Still another embodiment of the protein of the present invention has an amino acid sequence of at least positions 78 to 79, 152 to 175, 235, and 296 in the amino acid sequence of SEQ ID NO: 2; A protein having lactate dehydrogenase activity. 78th-79th, 152-
- the amino acid sequences at positions 175, 235, and 296 are considered to be characteristic in the amino acids of SEQ ID NO: 2, and when the amino acid sequence includes the amino acid sequence and has D-LDH activity, the present invention is preferred. It can be said that it is a protein. More preferably, described in SEQ ID NO: 2 It is a protein having a histidine residue at position 296 as an active center and an amino acid residue at positions 152 to 175 of a NADH binding site as a coenzyme in the amino acid sequence of the above.
- the protein of the present invention as described above is included in the polynucleotide of the present invention, as long as it has D-LDH activity, other than the protein having the amino acid sequence of SEQ ID NO: 2.
- the protein of the present invention can be obtained by culturing Leuconostoc. Mesenteroides IF03426 strain. That is, it can be obtained as a culture.
- the strain can be cultured by a known bacterial culture method.
- the protein of the present invention can be purified by a known method.
- the culture itself or the cells can be recovered and used as the enzyme active substance of the present invention.
- the bacterial cell-purified enzyme or crudely purified enzyme can be used as it is, or can be immobilized.
- the protein of the present invention is prepared by introducing a site-specific displacement method (Current Protocols I Molecular Biology edit. Ausubel et al., (1987) Publi) to the amino acid sequence of SEQ ID NO: 2 or another amino acid sequence. Using sh. John Wily & Sons Sectoin 8.1-8.5.5) or the like, it can be obtained by appropriately introducing substitution, deletion, insertion, and no or additional mutation.
- site-specific displacement method Current Protocols I Molecular Biology edit. Ausubel et al., (1987) Publi
- sh. John Wily & Sons Sectoin 8.1-8.5.5 or the like, it can be obtained by appropriately introducing substitution, deletion, insertion, and no or additional mutation.
- modifications are not limited to those in which mutations are artificially introduced or synthesized, but also include those caused by amino acid mutations in the natural world based on or not limited to artificial mutation treatment. Is done.
- a polynucleotide comprising the nucleotide sequence of SEQ ID NO: 1 or a DNA which is a homolog thereof is obtained, and this DNA is introduced into a host to prepare a transformant, which is then cultured to obtain a homologous protein. Can be obtained.
- a known protein having a known D-LDH activity can be used.
- proteins derived from prokaryotes such as lactic acid bacteria, Escherichia coli, Bacillus subtilis, and fungi, or proteins derived from eukaryotes such as yeast and octopus can be used.
- proteins do not need to be proteins having the amino acid sequence of SEQ ID NO: 2, and need not be homologs of proteins consisting of the amino acid sequence.
- the present invention which retains a protein having D-LDH activity so that it can be expressed Is useful for the production of D-LDH and the production of D-lactic acid.
- cells which are preferable as the gene resources of the polynucleotide or protein of the present invention or the polynucleotide ⁇ protein for obtaining the transformant of the present invention are not limited to naturally occurring organisms. Microorganisms or cells obtained by mutagenesis or the like can also be used as genetic resources.
- the protein used in the present invention has D-LDH activity, and the activity is measured, for example, using a commercially available kit (LACTATE DEHYDROGENASE (LDH / LD) TEST-UV (manufactured by SIGMA)). can do.
- LACTATE DEHYDROGENASE LH / LD
- TEST-UV manufactured by SIGMA
- the DNA segment is used.
- This DNA construct can be used as an expression vector by itself or by introducing it into an appropriate vector.
- a transformant that produces a protein having D-LDH activity can be obtained by transforming a host cell with these DNA constructs. Further, by culturing this transformant, a protein having D-LDH activity can be produced. It can also produce D-lactic acid.
- a DNA construct that enables the DNA segment consisting of D-LDH-DNA to be expressed in host cells is used.
- DNA construct for transformation examples include, but are not limited to, plasmid (DNA), bacteriophage (DNA), retrotransposon (DNA), and artificial chromosome (YAC, PAC, BAC, MAC, etc.). It can be selected and adopted depending on the gene transfer form (extrachromosomal or intrachromosomal) and the type of host cell. Therefore, the present DNA construct can include, in addition to the present DNA, a component segment of the vector of any of these embodiments.
- Preferred prokaryotic vectors, eukaryotic vectors, animal cell vectors, and plant cell vectors are well known in the art.
- the plasmid DNA includes, for example, YCp-type E. coli-yeast shuttle vector such as pRS413, pRS415, pRS416, YCp50, pAUR112 or pAUR123, YEp-type E. coli-yeast shuttle vector such as pYES32 or YEpl3, pRS403, pRS404 , PRS405, pRS406, 2004/007317 Yip-type E. coli-yeast shuttle vector such as pAURlOl or pAUR135, plasmid derived from E.
- YCp-type E. coli-yeast shuttle vector such as pRS413, pRS415, pRS416, YCp50, pAUR112 or pAUR123
- YEp-type E. coli-yeast shuttle vector such as pYES32 or YEpl3, pRS403, pRS404 , PRS405,
- ColE-based plasmid such as pBR322, pBR325, pUC18, pUC19, pUC119, pTV118N, pTV119N, pBluescript, pHSG298, pHSG396 or pTrc99A
- PLA-based plasmid such as pACYC177 or pACYC184, pMW118, pMW119, pMW218 or pMW219 of any pSClOl-based plasmid, etc.
- plasmid derived from Bacillus subtilis e.g., can be cited pUB110, ⁇ ⁇ 5 etc.
- phage DNA examples include ⁇ phage (Charon4A, Charon21A, EMBL3, EMBL4; Lgtl00, gtll, zap), ⁇ ⁇ 174, M13mpl8 or M13mpl9.
- retrotransposons examples include Ty factors.
- YAC examples include pYACC2.
- a fragment containing D-LDH-DNA can be cut with an appropriate restriction enzyme, and inserted into a restriction enzyme site of a vector DNA to be used or a multicloning site.
- the first embodiment of the present DNA construct comprises a promoter segment which is operably linked to a DNA segment consisting of D-LDH-DNA. That is, the present DNA segment is linked to the downstream side of the promoter so that it can be controlled by the promoter.
- promoters include, for example, pyruvate decarboxylase gene promoter, gal promoter, galO promoter, heat shock protein promoter,
- MF ct l promoter PH05 promoter
- PGK promoter PGK promoter
- GAP promoter GAP promoter
- ADH promoter it is preferable to use the ADH promoter, A0X1 promoter and the like.
- a pyruvate decarboxylase (1) gene promoter derived from the genus Saccharomyces is preferred, and a pyruvate decarboxylase 1 gene derived from Saccharomyces cerevisiae is more preferably used. This is because these promoters are highly expressed in the ethanol fermentation pathway of the genus Saccharomyces (Cerepiche).
- the promoter sequence can be isolated by a PCR amplification method using the genomic DNA of pyruvate decarboxylase 1 gene of yeast belonging to the genus Saccharomyces as type III.
- nucleotide sequence of the promoter derived from Saccharomyces cerevisiae is shown in SEQ ID NO: 5.
- the promoter segment in this DNA construct In addition to the DNA consisting of the nucleotide sequence of SEQ ID NO: 5 and the nucleotide sequence in which one or several bases have been deleted, substituted, inserted, Z-added, etc. DNA having promoter activity, and DNA prepared from all or a part of the base sequence represented by SEQ ID NO: 5 or its complementary chain and hybridizing under stringent conditions, and having promoter activity DNA (in other words, a homolog of the promoter) can be used.
- the second DNA construct which is another embodiment of the present DNA construct, comprises a DNA segment for homologous recombination of a host chromosome in addition to DNA.
- the DNA segment for homologous recombination is a DNA sequence homologous to the DNA sequence in the host chromosome near the target site into which the present DNA is to be introduced. At least one, and preferably two, DNA segments for homologous recombination are provided.
- the two DNA segments for homologous recombination be DNA sequences homologous to the DNA upstream and downstream of the target site on the chromosome, and the present DNA be ligated between these DNA segments.
- the present DNA can be controllably introduced by a promoter on the host chromosome.
- the endogenous gene which should be controlled by the promoter can be destroyed at the same time, and foreign D-LDH-DNA can be expressed in place of the endogenous gene. It is particularly useful when the promoter is a high expression promoter in a host cell.
- a gene that is highly expressed in the host chromosome is targeted, and D-LDH-DNA is introduced downstream of the promoter that controls this gene so that it is controlled by the promoter. It is preferable to do so.
- the pyruvate decarboxylase gene (particularly, pyruvate decarboxylase 1 gene) is targeted and controlled by the endogenous pyruvate decarboxylase gene promoter. DNA encoding the LDH active protein can be introduced into the DNA.
- the DNA segment for homologous recombination is composed of the pyruvate decarboxylase 1 gene LDH structural gene region or a sequence in the vicinity thereof (opened). JP2004 / 007317 (including sequences near the start codon, sequences in the upstream region of the start codon, sequences in structural genes, etc.). Also, a segment of the pyruvate decarboxylase gene promoter can be included in the DNA construct.
- a DNA construct targeting the pyruvate decarboxylase 1 gene of the genus Saccharomyces (especially cerepiche) as a host is used.
- the disruption of the pyruvate decarboxylase 1 gene and the replacement of this structural gene with D-LDH can be achieved with a single vector.
- Pyruvate decarboxylase 1 is an enzyme that mediates the reverse addition reaction of pyruvate to acetoaldehyde.By disrupting this gene, it is expected that ethanol production via acetoaldehyde will be suppressed, It is expected that the production of D-lactic acid by D-LDH using pyruvic acid as a substrate is promoted.
- the first DNA construct can also be used as a DNA construct for homologous recombination by providing a DNA segment for homologous recombination with the host chromosome.
- the promoter segment in the DNA construct can also be used as a DNA segment for homologous recombination with the host chromosome.
- a DNA construct having a promoter in the Saccharomyces cerevisiae host chromosome for example, a pyruvate decarboxylase 1 gene promoter as a promoter segment, is capable of linking the host gene to a target site.
- a targeting vector to be configured. In this case, it is preferable to provide a homologous sequence to the structural gene region on the downstream side of the pyruvate decarboxylase 1 gene.
- a terminator a cis element such as an enhancer, a splicing signal, a polyA addition signal, a selection marker, and a liposome binding sequence (SD sequence) can be linked to the DNA construct, if necessary.
- the selection marker is not particularly limited, and various known selection genes such as a drug resistance gene and an auxotrophy gene can be used. For example, dihydrofolate reductase gene, hygromycin B, neomycin resistance gene and the like can be used.
- the DNA construct Once the DNA construct has been constructed, transform it into a suitable host cell. Yon method, transfection method, bonding method, protoplast fusion, electoral porosion method, lipofection method, lithium acetate method, particle gun method, calcium phosphate precipitation method, agglomerate method, PEG method, direct micro This can be introduced by any of a variety of suitable means, such as injection techniques. After introduction of the DNA construct, the recipient cells are cultured in a selective medium.
- Host cells include bacteria such as Eshrichia coli and Bacillus subtilis, yeast such as Saccharomyces 'cerevisiae, Shizosaccharomyces' bomb (Saccharomyces pombe) s Pichia pastoris, and insect cells such as sf9 and sf21. , COS cells, animal cells such as diatom hamster ovary cells (CH0 cells), and plant cells such as sweet potato and tobacco.
- it is a microorganism such as yeast that performs alcohol fermentation or an acid-resistant microorganism, for example, yeast such as Saccharomyces such as Saccharomyces cerevisiae. More specifically, Saccharomyces' Celebiche IF02260 strain and YPH strain.
- the components of the DNA construct will be present on the chromosome or on extrachromosomal factors (including artificial chromosomes). If the DNA construct is maintained extrachromosomally or is integrated into the chromosome by random integration, other enzymes using pyruvate as a substrate of LDH as a substrate, for example, pyruvate deprivation It is preferable that the gene for the carbonic enzyme (in the yeast of the genus Saccharomyces, pyruvate decarboxylase 1 gene) is knocked out by a targeting vector.
- the DNA construct described above which is capable of achieving homologous recombination, it is controlled by the desired promoter on the host chromosome, the promoter replaced with the promoter, or the promoter downstream of the homolog thereof.
- the desired promoter on the host chromosome There will be D-LDH-DNA operably linked.
- the pyruvate decarboxylase 1 gene promoter on the host chromosome, the promoter replaced with the promoter, or the promoter downstream of the homolog can be controlled by the promoter.
- -It is preferable to have LDH-DNA.
- a selectable marker gene or a part of the disrupted structural gene is used downstream of the D-LDH-DNA is used downstream of the D-LDH-DNA is used downstream of the D-LDH-DNA in the homologous recombinant. Corresponding to).
- D-LDH-DNA The ability to produce the protein encoded by D-LDH-DNA as a result of the introduction of the DNA construct.In particular, it breaks down the yeast pyruvate decarboxylase gene and, at the same time, under the control of the promoter of the gene or its homolog.
- D-LDH By introducing D-LDH, it is possible to produce D-LDH even in yeast which does not originally produce D-lactic acid, and as a result, it is possible to produce D-lactic acid.
- yeast specifically, Saccharomyces, typically cerevisiae
- yeast produces only D-lactic acid by introducing D-LDH-DNA under the promoter of the pyruvate decarboxylase 1 gene or a homolog thereof.
- D-DLH-DNA encodes a protein having D-LDH activity, it is presumed that it is highly expressed by the promoter, and it is inferred that it contributes to high production of D-lactic acid.
- coding a protein consisting of the amino acid sequence of SEQ ID NO: 2 with D-LDH-DNA also contributes to high production of D-lactic acid and selective production of D-lactic acid or D-lactic acid. Is done.
- D-LDH-DNA has been introduced under a desired promoter can be confirmed by a PCR method or a Southern hybridization method. For example, it can be confirmed by preparing DNA from a transformant, performing PCR using an introduction site-specific primer, and detecting an expected band in the electrophoresis of the PCR product. Alternatively, it can be confirmed by performing PCR using primers labeled with a fluorescent dye or the like. It can also be identified by the protein produced by the transformant. These methods are well known to those skilled in the art.
- a transformant into which a large number of copies of the D-LDH gene have been introduced by introducing the DNA construct.
- two or more copies, preferably 4 to 10 copies of D-LDH-DNA are introduced.
- a transformant in which the D-LDH gene has been introduced in multiple copies has significantly improved D-lactic acid-producing ability.
- the productivity of D-lactic acid can be significantly improved.
- a culture By culturing the transformant obtained by introducing the DNA construct, a culture can be obtained. D-LDH, which is the expression product of the foreign gene, is produced therein, and D-lactic acid is produced. Lactic acid can be obtained by performing the step of separating lactic acid from the culture.
- the culture includes not only the culture supernatant but also cultured cells or bacterial cells, or crushed cells or bacterial cells.
- D-lactic acid can be selectively produced by using a cell such as yeast which does not naturally produce D-lactic acid as a host.
- D-lactic acid can be obtained efficiently by using fermenting microorganisms.
- transformants using yeast as a host are useful for high production of D-lactic acid because of rapid growth. According to such a transformant capable of selectively producing D-lactic acid, it is not necessary to separate optical isomers, and a more efficient production of one layer is possible.
- culturing conditions can be selected according to the type of the transformant.
- Such culture conditions are well known to those skilled in the art.
- the medium for culturing transformants obtained using microorganisms such as Escherichia coli and yeast as a host contains carbon sources, nitrogen sources, inorganic salts, etc. that can be assimilated by the microorganisms, and efficiently cultivates the transformants. Any of natural and synthetic media can be used as long as the culture can be performed in the same manner.
- the carbon source carbohydrates such as glucose, fructose, sucrose, starch, and cellulose, organic acids such as acetic acid and propionic acid, and alcohols such as ethanol and propanol can be used.
- ammonia As a nitrogen source, ammonia, an ammonium salt of an inorganic acid or an organic acid such as ammonium chloride, ammonium sulfate, ammonium acetate, ammonium phosphate or other nitrogen-containing compounds, peptone, meat extract, corn steep liquor, etc. are used. be able to.
- the inorganic substance potassium potassium phosphate, magnesium phosphate, magnesium sulfate, sodium chloride, ferrous sulfate, manganese sulfate, copper sulfate, calcium carbonate and the like can be used.
- the cultivation can usually be performed at 30 ° C. for an appropriate time under aerobic conditions such as shaking culture or aeration and stirring culture. For example, it can be performed for 6 to 120 hours.
- the pH is preferably maintained at 2.0 to 6.0.
- the pH can be adjusted using an inorganic or organic acid, an alkaline solution, or the like.
- a medium for culturing transformants obtained using animal cells as a host generally used RPMI 1640 medium or DMEM medium used in JP2004 / 007317, or a medium obtained by adding a fetal serum or the like to these mediums can be used.
- the cultivation is carried out 5% C0 2 the presence of 1 to 30 days 37 ° C.
- antibiotics such as kanamycin and penicillin may be added to the medium as needed.
- the culture may be a batch type or a continuous type.
- a method of obtaining as D-lactic acid, which is neutralized with an alkali such as ammonium or calcium salt, and obtaining as a lactate such as D-lactic acid ammonium or D-calcium lactate as free-form D-lactic acid can also be adopted.
- various combinations of ordinary purification means can be used to separate the gene product D-lactic acid from the culture.
- the gene product when produced in transformed cells, the gene product can be separated from the cells by disrupting the cells by ultrasonic crushing, trituration, pressure crushing, etc., in a conventional manner. . In this case, a protease is added as needed. If D-lactic acid is produced in the culture supernatant, the solid content of this solution is removed by filtration or centrifugation.
- the culture solution can be subjected to at least one solid-liquid separation process such as belt press, centrifugation, or filter press to perform the solid-liquid separation step. It is preferable to perform a purification step on the separated filtrate.
- a purification step for example, an organic acid or saccharide other than lactic acid is removed from the filtrate containing lactic acid by electrodialysis to obtain an aqueous solution of lactic acid or ammonium lactate.
- ammonia can be decomposed by a bipolar membrane or the like to form a lactic acid aqueous solution and ammonia water.
- the temperature of the various liquids during electrodialysis is usually 2045 ° C, preferably in the range of 35 to 40 ° C.
- Amino acids, inorganic ions (K, Ca, Mg, etc.) and organic acids (taenoic acid, malic acid, etc.) that could not be removed by electrodialysis can be removed at a later stage by a chromatographic separation device or ion exchange device.
- the obtained lactic acid solution can be concentrated. For example, water in the solution is evaporated to obtain a lactic acid solution having a concentration of 50 to 90%.
- the culture solution and the crude extract fraction are not limited to the above-mentioned methods, and it is possible to purify D-lactic acid or a salt thereof using various purification methods such as separation and extraction with an organic solvent and distillation. it can. If necessary, various D-lactic acid derivatives can be obtained by subjecting the culture solution, the crude extract fraction and its purified product to esterification, lactide formation, oligomerization, or prevolimerization. it can. If necessary, one or more of D-lactic acid, a salt thereof, and a derivative thereof can be collected from the lactic acid fermentation solution.
- D-lactic acid can be produced not by a culture system but by an enzyme reaction system.
- the enzymatic reaction conditions may be those that can produce D-lactic acid, and D-lactic acid obtained by such a method can be subjected to various derivatizations.
- a lactic acid-based polymer can be produced by using the obtained D-lactic acid, a salt thereof, and a derivative thereof as at least one kind of a polymer material.
- a polymer material besides a monomer of D-lactic acid or a derivative thereof, a prepolymer or oligomer obtained by polymerizing these to an appropriate length can also be used.
- L-lactic acid and its derivatives, and these prepolymers and oligomers can also be used.
- lactic acid-based polymers include homopolymers of D-lactic acid, heteropolymers with L-lactic acid, heteroblock polymers, and various heteropolymers with other polymer materials other than lactic acid. Can be.
- a lactic acid-based polymer can be obtained by reacting these lactic acid-based polymer materials, or a lactic acid-based polymer material and another polymer material together with a suitable polymerization initiator.
- D-lactic acid selective production and high production of D-lactic acid are possible, so that D-lactic acid can be obtained with high efficiency, and as a result, lactic acid using D-lactic acid as a material for polymerization
- the system polymer can be produced efficiently.
- Example 1 Isolation of D-lactate dehydrogenase gene
- D-LDH gene sometimes simply referred to as the D-LDHME gene
- the genomic DNA of IF03426 strain (a strain registered with the Fermentation Research Institute, Japan) was isolated as a type III by PCR amplification.
- the genomic DNA of this strain was determined using a genomic DNA preparation kit, Fast DNA Kit (Bio101) according to the attached protocol.
- the DNA concentration of the prepared genomic DNA was measured using a spectrophotometer Urtro spec 3000 (manufactured by Amersham Pharmacia Biotech).
- K0D Plus DNA Polymerase (manufactured by Toyobo Co., Ltd.), which is considered to have high accuracy of the amplified fragment, was used as the amplification enzyme.
- the ⁇ 1 reaction solution was subjected to DNA amplification using a PCR amplifier Gene Amp PCR system 9700 (manufactured by PE Applied Biosysteras).
- the reverse conditions of PCR are as follows: after heat treatment at 96 ° C for 2 minutes, one cycle consists of three types of temperature changes: 96 ° C for 30 seconds, 53 ° C for 30 seconds, and 72 ° C for 90 seconds This was repeated for 25 cycles and finally to 4 ° C.
- This reaction sample 5 ⁇ 1 was electrophoresed on a 1% TBE agarose gel (containing 0.5 / _ig / ml of ethidium bromide), and the gel was subjected to DNA banding by 254 nra ultraviolet irradiation (Funakoshi). Was detected, and the amplified gene fragment was confirmed.
- the primer DNA used in the reaction was synthetic DNA (Sade Technology Co., Ltd.), and the DNA sequence of this primer was as follows.
- the PCR amplified fragment was subcloned into pBluescriptll SK + vector (manufactured by Toyobo Co., Ltd.).
- a series of reaction operations was performed according to a general DNA subcloning method. That is, the restriction enzyme Eco RV (Takara Shuzo) and phosphatase
- Eco RV Transcription Ribonuclease
- Alkaline Phosphatase manufactured by Takara Shuzo
- T4 DNA Ligase for the T4 DNA Li gase reaction, LigaFast Rapid DNA Ligation (promega) was used, and the details followed the attached protocol.
- Competent cells were JM109 strain (manufactured by Toyobo), and the detailed handling was in accordance with the attached protocol. Colony selection was performed on an LB plate containing ampicillin lOOig / ml, plasmid DNA was prepared from each selected colony, PCR was performed using the above primer DNA, and the D-LDH gene of interest was obtained. Subcloned. The detailed manual of the different operation such as ethanol precipitation treatment and restriction enzyme treatment followed Molecular Cloning A Laboratory Manual second edition (Maniatis et al., Cold Spring Harbor Laboratory Press. 1989).
- the nucleotide sequence of the D-LDH gene obtained in this manner was determined.
- Nucleotide sequence ABI PRISM 310 Genetic Analyzer PE Applied Biosystems
- sample preparation methods and equipment were used. For details of the method, etc., we followed the manual attached to the equipment.
- the isolated vector DNA containing the D-LDH gene was prepared by an alkali extraction method, and this was purified by GFX DNA Purification kit (manufactured by Amersham Pharmacia Biotech), and then purified with a spectrophotometer Urtro spec 3000 (Amersham Pharmacia Biotech), and the DNA concentration was measured and used.
- SEQ ID NO: 1 The DNA sequence determined by sequence analysis is shown in SEQ ID NO: 1, and the corresponding amino acid sequence is shown in SEQ ID NO: 2.
- Figures 1A and B show the nucleotide sequence (SEQ ID NO: 1) of the D-LDHME gene obtained this time.
- FIG. 3 shows homology data with the base sequence (SEQ ID NO: 3) of the D-LDH gene registered in GenBank.
- the upper sequence shows the base sequence of the D-LDH gene obtained in this example, and the lower sequence shows the base sequence of the registered D-LDH gene.
- Figure 2 shows the amino acid sequence corresponding to the nucleotide sequence of the D-LDHME gene obtained this time (SEQ ID NO: 2) and the registered amino acid sequence corresponding to the nucleotide sequence of the D-LDH gene (SEQ ID NO: 4).
- 1 shows the homology data of.
- the upper sequence shows the amino acid sequence corresponding to the D-LDHME gene obtained in this example, and the lower sequence shows the amino acid sequence corresponding to the registered D-LDH gene.
- amino acid sequence of the gene obtained in this example had the amino acid residue substitution shown in Table 2.
- a chromosome transfer vector capable of expressing the D-LDHME gene obtained in Example 1 as a target gene under the control of the bilbic acid decarboxylase 1 gene (PDC1) promoter sequence from Saccharomyces cerevisiae was constructed.
- This newly constructed chromosome transfer vector was named pBTRP-PDC1-DLDHME vector.
- a series of reaction operations in the construction of the vector were performed according to a general DNA subcloning method.
- FIGS. A series of enzymes involved in vector construction were all manufactured by Takara Shuzo Co., Ltd. Note that the vector construction procedure is not limited to this.
- PDC1 gene promoter fragment PDC1 gene promoter fragment
- PDC1D PDC1 gene downstream region fragment
- IF02260 971 bp of the promoter fragment of the PDC1 gene (PDC1P) and 518 bp of the downstream region of the PDC1 gene (PDC1D), which are necessary gene fragments, were obtained using the Saccharomyces cerevisiae IF02260 strain as a genetic resource. It was isolated by PCR amplification using genomic DNA as type I.
- the IF02260 strain is a strain registered with the Fermentation Research Institute.
- the genomic DNA of this strain was determined using a genomic DNA preparation kit, Fast DNA Kit (manufactured by Bio101), according to the attached protocol.
- the DNA concentration of the prepared genomic DNA was measured with a spectrophotometer Urtro spec 3000 (manufactured by Amersham Pharmacia Biotech).
- the accuracy of the amplified fragment is considered to be high as the amplification enzyme
- KOD Plus DNA Polymerase (manufactured by Toyobo Co., Ltd.) was used. 50 ng of genomic DNA of IF02260 strain prepared in advance, 50 pmol of primer DNA X 2, 10 X K0D Enzyme reaction buffer
- DNA amplification was performed using 9700 (manufactured by PE Applied Biosystems).
- the PCR reaction conditions were as follows: heat treatment at 96 ° C (: 2 minutes, 30 seconds at 96 ° C, 30 minutes at 53 ° C). The three types of temperature change of 90 seconds at 72 ° C for one second were defined as one cycle, and this was repeated for 25 cycles, and finally at 4 ° C.
- This reaction sample 5 ⁇ 1 was electrophoresed on a 1% TBE agarose gel (containing 0. S ⁇ g / ml ethidium bromide), and this gel was irradiated with 254 nm ultraviolet light (Funakoshi). The DNA band was detected, and the amplified gene fragment was confirmed.
- the primer DNA used in the reaction was synthetic DNA (Sade Technology Co., Ltd.).
- the DNA sequence of this primer was as follows.
- the PDC1P amplified fragment was digested with restriction enzymes BamHI / EcoRI and
- the amplified PDC1D fragment was treated with a restriction enzyme Xhol / Apal.
- a restriction enzyme Xhol / Apal for a detailed manual of the series of procedures for ethanol precipitation and restriction enzyme treatment, see Molecular
- the obtained culture was spread on an LB plate containing 100 g / ml of the antibiotic ampicillin, and cultured.
- the grown colonies were confirmed by colony PCR using the primer DNA of the insert fragment, and confirmed by restriction enzyme treatment of the plasmid DNA preparation solution by miniprep, and the target vector pBPDClP vector was isolated. ( Figure 3, middle).
- pYLDl vector (described in JP-A-2001-204468) constructed by Toyota Motor Corporation was treated with the restriction enzyme EcoRI / Aatll and the terminal modification enzyme T4 DNA polymerase.
- the LDH gene (derived from Bifidobacterium longum) fragment obtained in the above was subcloned into the pBPDClP vector, which had also been treated with the EcoRI restriction enzyme and T4 DNA polymerase, and subcloned in the same manner as described above.
- a pBPDClP-LDHI vector was prepared (middle to bottom in FIG. 3).
- the above pYLDl vector was introduced into Escherichia coli (name: “E.
- this vector was treated with Xhol / Apal, and the amplified PDC1D fragment similarly treated with restriction enzymes was ligated to prepare a pBPDClP-LDHII vector (upper row in FIG. 4).
- the pBPDClP-LDHII vector that had been treated with EcoRV and T4 DNA polymerase was ligated with a Trp marker fragment obtained by treating the pRS404 vector (promega) with Aatll / Sspl and T4 DNA polemerase.
- PBTRP-PDC1-LDH vector See lower part of Fig. 4).
- the already obtained pBPDClP vector was treated with the restriction enzyme HincII and the phosphatase Alkaline Phospatase.
- the fragment containing the Trp marker was ligated to construct the pBTRP-PDC1PII vector. did.
- the D-LDHME gene fragment isolated in Example 1 was ligated into a vector obtained by treating the pBTRP-PDC1PII vector with a restriction enzyme treatment EcoRV and treating with a terminal modification enzyme T4 DNA polymerase.
- D-LDH genes As other D-LDH genes, oligonucleotides were synthesized according to the gene sequence (SEQ ID NO: 3) in the D-1DH gene database GenBank ACCESSION No. L29327 derived from the lactic acid bacterium Leuconostoc mesenteroides, and these were sequentially ligated. Eligible! )-LDH gene was totally synthesized. The same procedure as in this example was applied to this gene fragment to construct a chromosome transfer vector.
- the host yeast strain IF02260 (a strain registered with the Fermentation Research Institute) that lacks the ability to synthesize tryptophan is cultured in lOmlYPD medium at 30 ° C until logarithmic growth and collected. And washing with TE buffer was performed. Next, 0.5 ml of TE buffer and 0.5 ml of 0.2 M lithium acetate were added, and after shaking culture at 30 ° C for 1 hour, restriction enzymes Apal and Spel (both from Takara Shuzo) were added. Was added to pBTRP-PDC1-DLD orchid E.
- This strain was cultured in a YPD culture solution, and genomic DNA was prepared using a genomic DNA preparation kit FAST DNA Kit (Bio 101). When the presence or absence of the transgene was confirmed using PCR, a strain in which the D-LDHME gene had been introduced downstream of the PDC1 promoter was obtained.
- the obtained transgenic strain was applied to a spore induction medium, and spore induction was performed at 30 ° C. for 4 days.
- Bacteria were collected from the culture medium, added with 5 units of Zymolase (Zymorisearch), and subjected to an enzymatic reaction at 37 ° C for 1 hour, followed by a microscope (Olympus) and a micromanipulator (Narimo Kagaku). Was used to separate spores on YPD medium.
- the progeny of the obtained spores was confirmed to have the ability to select tryptophan markers, and it was confirmed that the spores were separated 2: 2 by PCR, and the desired diploid strain was obtained.
- the diploid strains were TC14-6-1A, TC14-6-2A, and TC14-63A.
- the obtained diploid strain has the structure shown in FIG. 7 in the yeast chromosome.
- D-LDH gene chromosome transfer vector constructed in Example 2 was also transferred to the IF02260 strain lacking tryptophan synthesis ability in the same manner as described above, and confirmed by PCR. , D-LDH has been introduced into the chromosome
- a self-propagating vector was constructed by introducing DLDHME into pYPD1 plasmid, a yeast self-proliferating 2 ⁇ -type plasmid vector, and the vector was introduced into the IF02260 strain in the same manner as described above. As a result, a strain (TC21-1 strain) carrying the plasmid having the D-LDH gene was obtained.
- a fermentation test was performed on the five types of transformed strains prepared in Example 3 and the parent strain IF02260. Each strain was inoculated into 5ral YPD liquid medium, subjected to shaking culture at 30 ° C. and 130 rpm to prepare cells required for fermentation production.
- the grown cells were collected, inoculated in a YPD liquid medium containing 10% glucose to a cell concentration of 0.5%, and fermented for 4 days at 30 ° C in a static condition.
- D-lactate with 2.5% calcium carbonate (Narakai Testa) added to the fermentation broth and free D-lactic acid without calcium carbonate.
- One I checked the formula.
- the parent strain the non-transgenic yeast (IF02260 strain) produces ethanol but not D-lactic acid, whereas the four strains prepared in Example 3 did not.
- the chromosome-introduced transformed yeast has reduced ethanol production relative to the parent strain, none of them! )-Lactic acid production was confirmed.
- transformants TC14-6-1A, TC14-6-2A, TC14-6-3A, and D-LDH which are transformants in which the D-LDHME gene has been introduced downstream of the chromosomal PDC1 promoter.
- D-lactic acid was produced at a concentration of 4-6% and ethanol was 2-3%. L-lactic acid was not produced in these chromosomal transfer transformants.
- chromosomal integration is effective for D-LDH expression and D-lactic acid production.
- the D-LDH gene (including the D-LDHME gene) is introduced under the control of the PDC1 promoter. was found to be effective for high production of D-lactic acid.
- D-lactic acid The high production of D-lactic acid is due to both D-lactate (calcium) and free L-lactic acid. Were observed to the same extent.
- Example 5 Genetically modified yeast having an increased number of introduced copies of the D-LDHME gene
- the TC14-6-3A strain was used to transfer the D-LDHME gene.
- a genetically modified yeast with an increased number of introduced copies of offspring was produced.
- the method of introducing the D-LD dragon E gene into the TC14-6-3A strain was in accordance with the method described in Example 3. That is, in this example, the D-LDHME gene was introduced into the TC14-6-3A strain by the method described in Example 3, except that the TC14-6-3A strain was used instead of using the yeast IF02260 strain as a host. did.
- the resulting transgenic strain TD1- 10- 1B lines, TD1- 10- 3 B strains, TD1- 10- 6A Kabu ⁇ Pi TD1-10 - was named 7D strain.
- 7D strain The resulting transgenic strain TD1- 10- 1B lines, TD1- 10- 3 B strains, TD1- 10- 6A Kabu ⁇ Pi TD1-10 - was named 7D strain.
- the copy number of the introduced D-LDHME gene was confirmed for these four strains in the same manner as in Example 3, it was found that four copies of the D-LDHME gene had been introduced.
- D-lactic acid-producing ability in the transformed yeast could be improved by increasing the introduced copy number of the D-LDHME gene.
- the transformed yeast into which four copies of the D-LD simple E gene had been introduced was examined.However, by introducing the D-LDHME gene at a higher copy number, D-lactic acid production can be further improved. . That is, according to the present example, it was found that a transformed yeast having more excellent D-lactic acid-producing ability can be produced by increasing the number of copies into which the D-LDHME gene was introduced. All publications, patents and patent applications cited herein are hereby incorporated by reference in their entirety. Industrial potential ADVANTAGE OF THE INVENTION According to this invention, the efficient production technique of D-lactic acid can be provided. Sequence listing free text
- SEQ ID NOS: 6 to 11 Artificial DNA (primer)
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CN2004800141697A CN1795270B (zh) | 2003-05-22 | 2004-05-21 | 编码具有d-乳酸脱氢酶活性蛋白质的dna及其用途 |
AU2004241394A AU2004241394B2 (en) | 2003-05-22 | 2004-05-21 | DNA coding for protein having D-lactic acid dehydrogenase activity and use thereof |
EP04734403A EP1637603B1 (en) | 2003-05-22 | 2004-05-21 | Dna coding for protein having d-lactic acid dehydrogenase activity and use thereof |
JP2005506422A JP4395132B2 (ja) | 2003-05-22 | 2004-05-21 | D−乳酸脱水素酵素活性を有するタンパク質をコードするdna及びその利用 |
DE602004025346T DE602004025346D1 (de) | 2003-05-22 | 2004-05-21 | Für ein protein mit d-milchsäure-dehydrogenaseaktivität codierende dna und verwendung davon |
BRPI0410550-8A BRPI0410550A (pt) | 2003-05-22 | 2004-05-21 | dna que codifica uma proteìna que tem atividade de d-lactano desidrogenase e seus usos |
US10/557,306 US20070105202A1 (en) | 2003-05-22 | 2004-05-21 | Dna encoding a protein having d-lactate dehydrogenase activity and uses thereof |
US12/324,804 US7964382B2 (en) | 2003-05-22 | 2008-11-26 | DNA encoding a protein having D-lactate dehydrogenase activity and uses thereof |
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US12/324,804 Continuation US7964382B2 (en) | 2003-05-22 | 2008-11-26 | DNA encoding a protein having D-lactate dehydrogenase activity and uses thereof |
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US7326550B2 (en) | 1997-09-12 | 2008-02-05 | Tate & Lyle Ingredients Americas, Inc. | Yeast strains for the production of lactic acid |
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WO2010140602A1 (ja) | 2009-06-03 | 2010-12-09 | 東レ株式会社 | D-乳酸脱水素酵素活性を有するポリペプチド、該ポリペプチドをコードするポリヌクレオチドおよびd-乳酸の製造方法 |
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JP2001029063A (ja) | 1999-07-19 | 2001-02-06 | Mitsubishi Heavy Ind Ltd | 高純度のd−乳酸を生成する微細藻と、これを用いたd−乳酸製造方法及び装置 |
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2004
- 2004-05-21 WO PCT/JP2004/007317 patent/WO2004104202A1/ja active Application Filing
- 2004-05-21 EP EP04734403A patent/EP1637603B1/en not_active Expired - Fee Related
- 2004-05-21 AU AU2004241394A patent/AU2004241394B2/en not_active Ceased
- 2004-05-21 US US10/557,306 patent/US20070105202A1/en not_active Abandoned
- 2004-05-21 CN CN2004800141697A patent/CN1795270B/zh not_active Expired - Fee Related
- 2004-05-21 BR BRPI0410550-8A patent/BRPI0410550A/pt not_active Application Discontinuation
- 2004-05-21 DE DE602004025346T patent/DE602004025346D1/de not_active Expired - Lifetime
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US7326550B2 (en) | 1997-09-12 | 2008-02-05 | Tate & Lyle Ingredients Americas, Inc. | Yeast strains for the production of lactic acid |
JP2006296377A (ja) * | 2005-04-25 | 2006-11-02 | Toyota Central Res & Dev Lab Inc | 有機酸生産用形質転換体 |
US7473540B2 (en) | 2005-09-22 | 2009-01-06 | Tate & Lyle Ingredients Americas, Inc. | Methods for selecting a yeast population for the production of an organic acid and producing an organic acid |
WO2010140602A1 (ja) | 2009-06-03 | 2010-12-09 | 東レ株式会社 | D-乳酸脱水素酵素活性を有するポリペプチド、該ポリペプチドをコードするポリヌクレオチドおよびd-乳酸の製造方法 |
US8822195B2 (en) | 2009-06-03 | 2014-09-02 | Toray Industries, Inc. | Polypeptide having D-lactate dehydrogenase activity, polynucleotide encoding the polypeptide, and process for production of D-lactic acid |
RU2553563C2 (ru) * | 2009-06-03 | 2015-06-20 | Торэй Индастриз, Инк. | Полипептид, обладающий активностью d-лактатдегидрогеназы, полинуклеотид, кодирующий этот полипептид, и способ получения d-молочной кислоты |
Also Published As
Publication number | Publication date |
---|---|
AU2004241394A1 (en) | 2004-12-02 |
EP1637603B1 (en) | 2010-01-27 |
US7964382B2 (en) | 2011-06-21 |
EP1637603A4 (en) | 2007-02-07 |
CN1795270B (zh) | 2011-09-21 |
EP1637603A1 (en) | 2006-03-22 |
JPWO2004104202A1 (ja) | 2006-07-20 |
CN1795270A (zh) | 2006-06-28 |
JP4395132B2 (ja) | 2010-01-06 |
US20070105202A1 (en) | 2007-05-10 |
AU2004241394B2 (en) | 2008-05-22 |
DE602004025346D1 (de) | 2010-03-18 |
US20090275095A1 (en) | 2009-11-05 |
BRPI0410550A (pt) | 2006-06-20 |
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