WO2006064746A1 - 短鎖脂肪酸耐性の向上した細胞の育種方法 - Google Patents
短鎖脂肪酸耐性の向上した細胞の育種方法 Download PDFInfo
- Publication number
- WO2006064746A1 WO2006064746A1 PCT/JP2005/022742 JP2005022742W WO2006064746A1 WO 2006064746 A1 WO2006064746 A1 WO 2006064746A1 JP 2005022742 W JP2005022742 W JP 2005022742W WO 2006064746 A1 WO2006064746 A1 WO 2006064746A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chain fatty
- short
- cell
- base
- dna
- Prior art date
Links
Classifications
-
- 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
-
- 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
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
-
- 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
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/52—Genes encoding for enzymes or proenzymes
-
- 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
- C12P7/52—Propionic acid; Butyric acids
-
- 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
- C12P7/54—Acetic acid
Definitions
- the present invention relates to a method for breeding a cell having improved short-chain fatty acid resistance. Specifically, a cell having improved short-chain fatty acid resistance by introducing and expressing a short-chain fatty acid resistance gene into cells such as microorganisms.
- the present invention relates to a method for breeding, a high-density cell culture method for producing useful substances, and an efficient production of a fermentation broth containing a short-chain fatty acid as a use of microbial cells obtained by the method. .
- microorganisms when these nutrient sources are consumed by the growth of microorganisms, the microorganisms produce short-chain fatty acids in the medium that are toxic to the growth of the microorganisms, such as formic acid and acetic acid. There was a problem that growth stopped.
- Escherichia coli which is often used for recombinant protein production, is widely used as a host bacterium in high-density aerobic fermentation.
- aerobic high density culture of E. coli it is common to add an appropriate amount of dalcose to the growth medium. Generated.
- These short-chain fatty acids are major factors that inhibit high-density culture and also inhibit the production of recombinant proteins (see, for example, Non-Patent Document 1 and Non-Patent Document 2).
- the fed-batch culture method it is possible to arbitrarily control the concentration of a specific component in the medium.
- the sugar concentration can be kept constant within the optimum range of the microorganisms cultured in the medium. For this reason, the target microorganism can be efficiently cultured and is widely adopted.
- the production of organic acid cannot be suppressed, and there are many problems such as a decrease in growth rate and a decrease in the yield of recombinant protein due to the generated organic acid.
- non-patent document 5 describes the lack of these enzyme (PTA and ACK) genes for E. coli. Mutant strains have been created. However, in these mutant strains, even if the biosynthesis system of acetic acid (PTA and ACK) is inactivated, there are still other pathways for the production of acetic acid. Although it was possible to lower the value, it was not possible to generate completely. Further, the above-mentioned defective mutant strains accumulated excessive organic acids other than acetic acid such as lactic acid and pyruvic acid (see, for example, Non-Patent Document 6 and Non-Patent Document 7).
- microorganisms that do not produce any short-chain fatty acids that are harmful to growth, such as formic acid and acetic acid produced during the cultivation of microorganisms, are still in development and have not been successful.
- ATP binding cassette ATP binding cassette
- binding cassette a gene group having a motif of (binding cassette)
- Genes having these ATP binding cassette motifs are generally referred to as the ABC transporter family, and metabolites and drugs can be transferred from the inside of the cell to the outside of the cell, or from the outside of the cell to the inside of the cell. It is presumed that it encodes a protein having the function of a transporter to transport.
- ABC transporter gene When one of these ABC transporter family genes (ABC transporter gene) is linked to a multicopy vector and introduced into acetic acid bacteria, the resulting transformant (acetic acid bacteria) is acetic acid. Although the resistance was improved, the resistance to other organic acids was not affected (for example, see Patent Document 1).
- Patent Document 1 Japanese Unexamined Patent Publication No. 2003-289868
- Non-Patent Document 1 "Applied 'Environmental Mental' Microbiology", 56 ⁇ , p. 1004-1011 (1990)
- Non-Patent Document 2 “Biotechnol. Bioengine.”, 39 ⁇ , p. 663—671 (1992)
- Non-Patent Document 3 "Trends Biotechnol.”, 14 ⁇ , p. 98-100 (1996)
- Non-Patent Document 4 “Appl. Microbiol. Biotechnol.”, 48 ⁇ , p. 597—601 (1997)
- Non-Patent Literature 5 “Biotechnol. Bioengineering”, 35 ⁇ , p. 732-738 (1990)
- Non-Patent Document 6 “Biotechnol. Bioengine.”, 38 ⁇ , p. 1318-1324 (1991)
- Non-Patent Document 7 “Bioscience, Biotechnology, and Neochemistry (Biosci. Biotechnol. Biochem.)”, 58 ⁇ , p. 2232-2235 (1994)
- the present invention firstly provides a raw material such as acetic acid and acetic acid while suppressing the growth of cells including microorganisms and maintaining high productivity of useful substances. It aims at providing the method of providing tolerance with respect to the short chain fatty acid harmful to growth.
- the second aspect of the present invention also provides a means for efficiently culturing a microorganism in the presence of a short-chain fatty acid and a means for producing a useful short-chain fatty acid by fermentation. Objective.
- acetic acid which is one of short-chain fatty acids.
- acetic acid bacteria which is presumed to be the ABC transporter family possessed by acetic acid bacteria that are used in the production of acetic acid fermentation.
- ABC transporter genes that make up the ABC transporter family could be introduced and expressed in heterologous cells other than the original acetic acid bacteria.
- acetic acid bacteria belongs to a genus completely different from that of acetic acid bacteria, and originally has low alcoholic acid ability, such as Escherichia coli, and Dalconacetobacter, which is acetic acid bacteria but has low ability to ferment acetic acid.
- Gluconacetobacter It was also found that transformants can be obtained from diazotrophicus). Unlike the case of acetic acid bacteria, the transformant is not unexpectedly inhibited from growth inhibition by short-chain fatty acids other than acetic acid (carbon number of 5 or less), that is, has resistance to short-chain fatty acids. The result was also found. It was also confirmed that the productivity of useful substances originally produced by these microorganisms by gene transfer and recombinant proteins introduced from outside did not decrease.
- the present invention is based on such knowledge.
- the present invention includes the following forces (1) to (11).
- a method for breeding a cell with improved short-chain fatty acid resistance characterized by introducing a gene encoding a protein having a function of discharging short-chain fatty acids from the inside of the cell to the outside of the cell.
- a DNA comprising a base sequence consisting of base numbers 301 to 2073 among the base sequences set forth in SEQ ID NO: 1 in the sequence listing.
- nucleotide sequences set forth in SEQ ID NO: 1 in the sequence listing the nucleotide sequence consisting of nucleotide numbers 301 to 2073, or the DNA of the nucleotide sequence that can serve as a probe with at least a partial force of the nucleotide sequence, and stringent conditions DNA containing a base sequence that hybridizes underneath, and that encodes a protein having a function of enhancing acetic acid resistance.
- a DNA comprising a base sequence consisting of base numbers 331 to 2154 among the base sequences set forth in SEQ ID NO: 3 in the sequence listing.
- nucleotide sequence consisting of nucleotide numbers 331 to 2154 or the DNA of the nucleotide sequence that can serve as a probe with at least a partial force of the nucleotide sequence, and stringent conditions DNA containing a base sequence that hybridizes underneath, and that encodes a protein having a function of enhancing acetic acid resistance.
- a gene encoding a protein having a function of discharging a short-chain fatty acid from the inside of the cell to the outside of the cell is the DNA shown in the following (a), (b), (c) or (d) The method for breeding cells according to (1) above, wherein (a) A DNA comprising a base sequence consisting of base numbers 1002 to 1724 and a base sequence consisting of base numbers 1724 to 2500 among the base sequences set forth in SEQ ID NO: 5 in the sequence listing.
- nucleotide sequences set forth in SEQ ID NO: 5 in the sequence listing the nucleotide sequences having the nucleotide numbers 1002 to 1724, or the DNA of the nucleotide sequence that can be a probe prepared from at least a part of the nucleotide sequence, and the stringent A protein having a function of enhancing acetic acid resistance, comprising a nucleotide sequence that is noisy under conditions and a nucleotide sequence consisting of nucleotide numbers 1724 to 2500 among the nucleotide sequences set forth in SEQ ID NO: 5 in the sequence listing DNA encoding the complex.
- nucleotide sequences set forth in SEQ ID NO: 5 in the sequence listing the nucleotide sequences having the nucleotide numbers 1002 to 1724, or the DNA of the nucleotide sequence that can be a probe prepared from at least a part of the nucleotide sequence, and the stringent Base sequence that can be neutralized under various conditions, and a base sequence consisting of base numbers 1724 to 2500 of the base sequence set forth in SEQ ID NO: 5 in the sequence listing, or a base that can be used as a probe with at least a partial strength of the base sequence
- a DNA comprising a nucleotide sequence that hybridizes under stringent conditions and a DNA that encodes a protein complex having a function of enhancing acetic acid resistance.
- nucleotide sequences set forth in SEQ ID NO: 8 in the sequence listing a nucleotide sequence consisting of nucleotide numbers 249 to 1025 or a nucleotide sequence that can serve as a probe with at least a partial strength of the nucleotide sequence
- a DNA comprising a nucleotide sequence that hybridizes under stringent conditions, and that encodes a protein having a function of enhancing acetate resistance.
- (11) A method for producing a fermentation broth containing a short-chain fatty acid, wherein the cell according to (8) is cultured under conditions under which the cell produces a short-chain fatty acid.
- the present invention it is possible to breed cells having resistance to short chain fatty acids and improved short chain fatty acid resistance.
- the breeding method of the present invention is applied to microbial cells, cells that are not affected by short-chain fatty acids that are harmful to the growth produced during culture can be efficiently bred.
- the microbial cells resistant to short-chain fatty acids obtained by the present invention can also be applied to high-density cell culture that produces short-chain fatty acids. It can also be used for the production of fermentation broth containing high concentrations of short-chain fatty acids. In particular, in the case of Escherichia coli or the like to which resistance to short chain fatty acids is imparted, the growth ability in culture is remarkably improved, and high concentrations of short chain fatty acids can be accumulated efficiently, which is industrially useful.
- FIG. 1 is a schematic diagram showing the construction of an E. coli acetic acid bacteria shuttle vector pGI18.
- FIG. 2 Growth amounts of transformant and non-transformant in Example 1 on (a) non-added medium, (b) formic acid-containing medium, (c) acetic acid-added medium, and (d) propionic acid-added medium. Shows change over time.
- FIG. 3 Changes in growth over time of transformant and non-transformant in (a) butyric acid-containing medium, (b) isobutyric acid-containing medium, and (c) n-valeric acid-added medium in Example 1. Indicates.
- FIG. 4 shows changes over time in the amount of growth of transformants and non-transformants in Example 2 in (a) formic acid-containing medium and (b) acetic acid-added medium.
- FIG. 5 is a schematic diagram of a restriction enzyme map of a gene fragment derived from Dalconacetopacter entaniii, the position of a short-chain fatty acid resistance gene, and a fragment inserted into plasmid pABC31.
- FIG. 6 shows time-dependent changes in growth amounts of transformants and non-transformants in Example 3 in (a) formic acid-containing medium and (b) acetic acid-added medium.
- FIG. 7 shows time-dependent changes in the amount of growth of transformants and non-transformants in Example 4 in (a) formic acid-containing medium and (b) acetic acid-added medium.
- FIG. 8 shows a restriction enzyme map of a cloned gene fragment derived from Dalconacetopacter 'entanyi, the position of a short-chain fatty acid resistance gene, and a schematic diagram of an inserted fragment into plasmid PABC41.
- FIG. 9 shows the growth of each cell in Example 6 (1) and the transition of the total organic acid content and the acetic acid content in the culture solution.
- FIG. 10 shows changes in the amount of growth in fed-batch culture of glucose in Example 6 (2).
- FIG. 11 shows the culturing process of the transformant and non-transformant in Example 7 in an acetic acid-containing medium.
- FIG. 12 shows a restriction map of DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the Sequence Listing, the position of the short-chain fatty acid resistance gene, and a schematic diagram of the inserted fragment into plasmid pABCl.
- An object of the present invention is to breed a cell into which a gene (short chain fatty acid resistance gene) having a function of discharging a short chain fatty acid from the inside of the cell to the outside of the cell, a cell bred by the breeding method, and the cell It is an object of the present invention to provide a high-density cell culture method using cells and a method for producing a fermentation broth containing useful short-chain fatty acids.
- a gene short chain fatty acid resistance gene
- the method for breeding cells with improved short-chain fatty acid resistance according to the present invention is described in claim 1.
- a gene short chain fatty acid resistance gene
- encoding a protein having a function of discharging a short chain fatty acid from inside the cell to the outside of the cell is introduced into the cell and expressed.
- the protein having a function of discharging a short-chain fatty acid from the inside of the cell to the outside of the cell is taken into the cell which is the object of the breeding method of the present invention and is taken into the cell or metabolized in the cell such as metabolism.
- a protein that can exert the function of discharging short-chain fatty acids produced by the function to the outside of the cell For example, in a culture medium to which an acetic acid concentration that affects growth is added, It means a protein that lowers the concentration of acetic acid by 15-20% or more.
- Specific examples of such a protein include a protein having the amino acid sequence shown in SEQ ID NO: 2, 4, or 9 in the sequence listing, and a protein complex having the amino acid sequence shown in SEQ ID NOs: 6 and 7. .
- mutation such as substitution, deletion, insertion, addition, inversion, etc. with 1 or multiple, preferably 1 or several amino acids
- mutations such as substitution, deletion, insertion, addition, inversion, etc.
- 1 or multiple, preferably 1 or several amino acids As long as it is a protein having a function of excreting short-chain fatty acids from the inside of the cell to the outside of the cell, it is also included in the above protein.
- one or more, preferably 1 or several amino acids include mutations such as substitution, deletion, insertion, addition, inversion, etc.
- the protein complex is also included in the above protein.
- the gene encoding the protein means a gene that contains the protein coding region and can be introduced and expressed in cells.
- a typical example of such a gene is an ABC transporter gene constituting a gene group derived from acetic acid bacteria presumed to be the ABC transporter family.
- the ABC transporter gene means a gene having an ATP-binding cassette motif or a gene encoding a protein complex by forming an operon with the gene having the motif.
- Genes having the ATP-binding cassette motif are generally referred to as the ABC transporter family, and metabolites and drugs can be transferred from the inside of the cell to the outside of the cell. Functions of transporters that transport into cells It is presumed that it encodes a protein having
- ABC transporter genes include, for example, SEQ ID NOs: 2, 4, and
- Examples thereof include a gene containing a coding region encoding a protein having the amino acid sequence shown in 6, 7, or 9.
- Base No. 1, 3, 5, or 8 [of J, the base sequence consisting of base numbers 301 to 2073 of U number 1 and base numbers 331 to 2154 of SEQ ID NO: 3
- Examples thereof include a DNA comprising a base sequence, a base sequence consisting of base numbers 1002 to 1724 of SEQ ID NO: 5 and a base sequence consisting of base numbers 1724 to 2500, or a base sequence consisting of base numbers 249 to 1025 of SEQ ID NO: 8. .
- DNAs only need to contain the above-mentioned specific base sequence.For example, use a DNA having the full-length ability of the base sequence described in SEQ ID NO: 1, 3, 5 or 8 in the sequence listing. Is also possible.
- DNAs are acetic acid bacteria (acetobacteria belonging to the genus Acetobacter and Dalconacetobacter) based on a primer designed based on the nucleotide sequence shown in SEQ ID NO: 1, 3, 5 or 8. ) Can be easily obtained by PCR using the ⁇ gene.
- DNA consisting of each base sequence described in SEQ ID NOs: 1 and 3 is Acetobacter aceti No. 1023 strain (National Institute of Advanced Industrial Science and Technology, Patent Biological Deposit Center (Ibaraki, Japan)).
- Tsukuba Rakuhito 1-chome 1 1-Chuo 6) (Former name: Ministry of International Trade and Industry, Institute of Industrial Science, Microbiological Technology Research Institute, former address: Tsukuba Rakuto 1-chome 1-3, Ibaraki, Japan) 1983 The deposit number is FERM BP-2287 dated June 27 (transferred from the original deposit dated February 13, 1989).
- DNA comprising each nucleotide sequence described in SEQ ID NOs: 5 and 8 in the Sequence Listing is a kind of (Gluconacetobacter entanii) Acetobacter altoacetigenes MH-2 24 strain (Incorporated Administrative Agency Research Institute Patent Biological Deposit Center (Ibaraki, Tsukuba 1-chome, 1-chome, 1-Chuo 6) (Former name: Ministry of International Trade and Industry, Institute of Microbial Technology, Institute of Microbiology, former address: Yatabe, Tsukuba-gun, Ibaraki, Japan No. 1-3 (Machihigashi) was deposited as the deposit number FERM BP—491 on February 23, 1984.
- nucleotide sequence consisting of nucleotide numbers 1724 to 2500 or a nucleotide sequence that can be a probe prepared from at least part of the nucleotide sequence, and a nucleotide sequence that hybridizes under stringent conditions
- DNA encoding a protein complex having a function of enhancing acetate resistance can be used in the same manner.
- the stringent condition means a condition in which a so-called specific hybrid is formed and a non-specific hybrid is not formed.
- Typical hybridization conditions include, for example, conditions in which washing is performed at 60 ° C at a salt concentration corresponding to 0.1% SDS with 1 X SSC.
- the short-chain fatty acid resistance gene described above encodes a protein having a function of discharging short-chain fatty acids from the inside of the cell to the outside of the cell is, for example, as described in Examples below. Is actually introduced into a cell and expressed, and the presence or absence of growth when the cell (transformant) is cultured in a medium containing a short-chain fatty acid and an increase in the amount of growth (the degree of proliferation) in the medium are determined. This can be confirmed by discrimination.
- the short-chain fatty acid means a fatty acid having a straight or branched chain structure having 1 to 5 carbon atoms, and may or may not have an unsaturated bond.
- Cells obtained by the breeding method of the present invention are particularly saturated fatty acids having a linear or branched structure having 1 to 5 carbon atoms, that is, formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, or It has strong V ⁇ resistance to valeric acid.
- the subject of the breeding method of the present invention is not particularly limited as long as it is a cell into which the short-chain fatty acid resistance gene is introduced and can be expressed.
- the cells include bacterial cells such as Escherichia coli, Bacillus subtilis and lactic acid bacteria, yeast cells, and microbial cells such as fungal cells such as microorganisms belonging to the genus Aspergillus.
- Examples of microbial cells include bacterial cells belonging to the genus Acetic acid bacteria, Escherichia coli or Bacillus, as described in claim 8.
- bacterial cells when targeting bacterial cells with low alcohol oxidation ability, such as Escherichia coli and acetic acid bacteria belonging to the genus Gluconacetobacter, the production and production efficiency of the short chain fatty acids and the growth of the cells are reduced. This is preferable because it can be significantly increased.
- Examples of acetic acid bacteria include acetic acid bacteria belonging to the genus Acetobacter and the genus Glue onacetobacter.
- Acetobacter aceti As a bacterium belonging to the genus Acetobacter, specifically, Acetobacter aceti is mentioned. Specifically, Acetobacter aceti No. 1023 strain (National Institute of Advanced Industrial Science and Technology) Biological Deposit Center (1st, 1st, 1st, 1st, Tsukuba, Ibaraki, Japan, 1st 6th) (Former name: Institute of Microbial Technology, Ministry of International Trade and Industry, former address: 1st, Tsukuba, 1st, Ibaraki, Japan) No.
- bacteria belonging to the genus Dalconacetopacter examples include Gluconacetobacter europaeus, Gluconacetobacter diazotrophicus, and Gluconacetobacter diazotrophicus.
- E. coli bacteria belonging to the genus Escherichia are preferred.
- bacteria belonging to the genus Escherichia include Escherichia coli, specifically, Escherichia coli K12 strain, Escherichia coli JM109 strain, Escherichia coli DH5 o; strain, Escherichia coli C600 strain, Escherichia coli BL21 strain, Escherichia coli W3110. You can use stocks.
- bacteria belonging to the genus Bacillus include Bacillus subtili. s) and Bacillus subtilis, and specifically, Bacillus subtilis Marburg 168 strain and the like can be used.
- yeast cells examples include Saccharomyces cerevisiae and Shizosaccharomyces pombe.
- Escherichia coli and Gluconacetobacter diazotrophicus are targeted. It is preferable to do.
- Escherichia coli inherently has a very low ability to oxidize alcohol, and Dalconacetobacter diazotrophicus is an acetic acid bacterium, but its ability to ferment short-chain fatty acids is conferred on these microorganisms. By doing so, its usefulness can be sufficiently enhanced.
- the introduction and expression of a short-chain fatty acid resistance gene into cells in the breeding method of the present invention can be performed using a recombinant vector. That is, by transforming cells with a recombinant vector in which a short chain fatty acid resistance gene is linked to an appropriate vector, a method for amplifying the intracellular copy number of the gene, or an appropriate vector with a short vector. By transforming cells using a recombinant vector in which a structural gene of a chain fatty acid resistance gene is linked to a promoter sequence that functions efficiently in the cell, the number of copies of the gene in the cell is amplified. It can be realized by the method.
- a phage vector or a plasmid vector that can be autonomously propagated in a host can be used as a vector for use in the production of a recombinant vector.
- plasmid vectors examples include plasmids derived from E. coli (eg, pBR322, pBR325, pUC118, pET16b, etc.), plasmids derived from Bacillus subtilis (eg, pUB110, pTP5, etc.), and plasmids derived from yeast (eg, Yepl3, Ycp50, etc.).
- plasmid vector examples include ⁇ phage ( ⁇ gtlO, ⁇ ZAP, etc.).
- transformants should be prepared using animal winoles betaters such as retrowinoles or vaccinia winoles, insect virus vectors such as noculovirus, bacterial artificial chromosomes (BAC), yeast artificial chromosomes (YAC), etc. You can also.
- animal winoles betaters such as retrowinoles or vaccinia winoles
- insect virus vectors such as noculovirus, bacterial artificial chromosomes (BAC), yeast artificial chromosomes (YAC), etc. You can also.
- the target DNA can also be introduced into a host using a multicopy vector or transposon.
- a multicopy vector or transposon can be used.
- a poson is also included in the recombinant vector of the present invention.
- Multi-copy vectors include pUF106 (see, for example, “Cellulose, p. 15 3—158 (1989)”, 1 ⁇ ⁇ 24 (for example, “Applied 'and' Environmental Romantic • Microbiology ( Appl. Environ. Microbiol.), 55 ⁇ , p. 171—176 (1989)), PGI18 (see, for example, Production Example 1 below), pTA5001 (A), pTA5001 ( ⁇ ) (see, for example, JP (See, for example, Sho 60-9488) pMVLl (for example, “Agricultural and Biologic Chemistry”), 52 ⁇ , which is a chromosomal integration vector. p. 3125-3129 (1988)).
- pUF106 see, for example, “Cellulose, p. 15 3—158 (1989)”
- 1 ⁇ ⁇ 24 for example, “Applied 'and' Environmental Romantic • Microbiology ( Appl. Environ. Microbiol.), 55 ⁇ , p. 171—176
- transposons include Mu and IS1452.
- a recombinant vector is produced by linking a short-chain fatty acid resistance gene to a vector
- the purified DNA is cleaved with an appropriate restriction enzyme, and the restriction enzyme site or multicloning of the appropriate vector DNA is cut.
- a method such as inserting into a site and linking to a vector is adopted.
- recombinant vectors when the obtained recombinant vector is introduced into a cell, it expresses a protein having a function of discharging a short-chain fatty acid from the inside of the cell encoded by the short-chain fatty acid resistance gene to the outside of the cell. It is necessary to be demonstrated. Therefore, in addition to short-chain fatty acid resistance genes and promoter sequences, recombinant vectors include cis-elements such as an enzyme, splicing signal, poly-A-linked signal, selection marker, and liposome binding sequence (SD). Array) etc. can also be connected and inserted.
- cis-elements such as an enzyme, splicing signal, poly-A-linked signal, selection marker, and liposome binding sequence (SD). Array) etc.
- examples of the selection marker include a dihydrofolate reductase gene, a kanamycin resistance gene, a tetracycline resistance gene, an ampicillin resistance gene, and a neomycin resistance gene.
- the promoter sequence of the short-chain fatty acid resistance gene on the chromosomal DNA is replaced with an acetic acid bacterium belonging to the genus Acetobacter or Dalconacetopacter, or another promoter sequence that functions efficiently in E. coli.
- a vector for homologous recombination may be constructed, and the vector may be used to cause homologous recombination on the microorganism chromosome.
- promoter sequences e.g., Kuroramufue plasmid pBR322 of E.
- coli ampicillin resistance gene (Takara Noio Co.), the kanamycin resistance gene of plasmid pHSG298 (Takara Bio Inc.), the plasmid P HSG396 (Takara Bio) -
- promoter sequences derived from microorganisms other than acetic acid bacteria such as promoters of genes such as call resistance gene and ⁇ -galactosidase gene.
- Vector construction for homologous recombination is well known to those skilled in the art.
- an endogenous short-chain fatty acid resistance gene in a microorganism under the control of a strong promoter, the copy number from the short-chain fatty acid resistance gene is amplified and expression is enhanced.
- DNAs having the respective base sequence strengths described in SEQ ID NOs: 1, 3, 5 and 8 in the sequence listing are respectively converted into acetic acid bacteria-Escherichia coli shuttle vectors (multi-copy).
- Vector pABCl11, pABC112, pABC31, and PABC41 obtained by ligation to pGI18 can be mentioned.
- the introduction and expression of a short-chain fatty acid resistance gene into cells in the breeding method of the present invention can be performed according to a conventional method using the above-described recombinant vector.
- a method using calcium ions see, for example, “Agricultural and Biologic Chemistry”, 49 ⁇ , p. 2091-2097 (1985)
- Elect mouth position method eg, “Proc. Natl. Acad. Sci. USA”, 87 ⁇ , p. 8130-8134 (1990), bioscience Biotechnology I. and Biochemistry. (See Biosci. Biotech. Biochem.), 58 ⁇ , 974, 1994, etc.
- a host cell examples thereof include an elect mouth position method, a spheroplast method, and a lithium acetate method.
- the selection of the transformant can be performed by utilizing the property of the marker gene constituted in the gene to be introduced. For example, when an ampicillin resistance gene is used, cells showing resistance to an ampicillin drug can be selected. Specifically, an appropriate amount of ampicillin (for example, about 100 gZml) is added as a selection medium. Using the resulting product, apply transformant, culture, and transform colonies that have grown on the selective medium. can do. When neomycin resistance gene is used, cells that are resistant to G418 drug can be selected.
- cells with improved short-chain fatty acid resistance can be obtained by introducing and expressing a short-chain fatty acid resistance gene in the cells as described above.
- a short-chain fatty acid resistance gene in the cells as described above.
- the ability of the cultivated cells to improve the resistance to short-chain fatty acids can be confirmed by culturing for 15 hours or longer in a medium supplemented with about 0.01 to 3% short-chain fatty acids. This can be done by measuring the absorbance and the dry cell weight and confirming that the original cells that have not been transformed show a production that is much higher than if they did not grow at all or not.
- the present inventors introduced the above-described thread-replacement vector pABCl 11 into the acetic acid bacteria Setobacter no. 1023 strain as shown in the Examples below. No. 1023ZpABCl ll strain obtained by recombination and the recombinant vector pABCl 11 introduced into E.
- JM109 strain JM109ZpABCl ll strain obtained in the same manner as the recombinant vector pABCl 11 ATCC49037ZpABCl11 strain obtained by introduction into the strain
- JM109ZpABC112 strain obtained by introducing the recombinant vector p ABC112 into Escherichia coli JM109 strain
- JM109ZpABC31 strain obtained by introducing the recombinant vector pABC31 into E. coli JM109 strain in the same manner JM109 / pABC41 strain obtained by introducing recombinant vector p ABC41 into E. coli strain JM109 was actually obtained.
- the high-density cell culture method of the present invention uses the cell of claim 8, that is, the short-chain fatty acid by the breeding method of the present invention described in [1] above. Expressed by introducing a resistance gene into bacterial cells belonging to the genus Acetic acid bacteria, Escherichia coli or Bacillus Bacterial cells belonging to the genus Acetic acid bacteria, Escherichia coli or Bacillus having improved short-chain fatty acid resistance are used.
- the high-density cell culture method means a method of culturing bacterial cells (cells) at a high density, generally 50 to 200 g (dry cell) ZL in the medium.
- the medium, culture time, and culture conditions can be set as appropriate depending on the cell type.
- any medium such as a natural medium or a synthetic medium may be used.
- Aeration culture at 37 ° C can be used.
- the high-density cell culture method of the present invention is resistant to short chain fatty acids. Since improved bacterial cells are used, growth inhibition can be prevented. That is, as described in claim 10, growth is inhibited even if cells are cultured in the presence of short-chain fatty acids that are toxic to growth, such as formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, or valeric acid. Therefore, it is possible to maintain the productivity of useful substances originally produced by microbial forces and recombinant proteins introduced with external forces.
- the useful substance is not particularly limited as long as it is a substance that can be produced by using microorganisms.
- One example is the microbial cell itself.
- the final density of cells can be improved by using the cells of the present invention, even substances produced by normal metabolism can be produced very efficiently. Examples include fatty acids, amino acids, antibiotics, enzymes, vitamins and alcohols. As shown in Example 6, the amount of organic acid produced in the medium can be increased.
- the recombinant protein include human growth hormone and peptide, interleukin 113, and interferon.
- Escherichia coli can efficiently produce organic acids such as citrate, malic acid, succinic acid and pyroglutamic acid in addition to the above short-chain fatty acids having 5 or less carbon atoms.
- Examples of the high-density cell culture method widely used from the laboratory level to the industrial production level include fed-batch culture and dialysis culture.
- the fed-batch culture is a method in which a specific nutrient source is fed continuously or intermittently to a medium according to the culturing time.
- a nutrient source for fed-batch cell growth Or a carbon source such as glucose or glycerol, which is a direct raw material for short-chain fatty acids that inhibit protein production.
- the schedule of fed-batch is a method of increasing the flow acceleration exponentially so that the concentration of carbon source in the medium and the growth concentration of Z or fungus can be kept constant, the concentration of carbon source in the medium
- the flow acceleration (feed amount) can be increased stepwise (generally every 2 to 5 hours) while keeping the concentration below the specified concentration.
- the culture conditions such as the type of medium, temperature, humidity, pH, time, presence / absence of agitation can be appropriately determined according to the type and state of bacterial cells.
- dialysis culture is a method in which an extracellular product such as acetic acid is removed from the culture system using a dialysis membrane or the like.
- the bacterial cells belonging to the genus Acetic acid bacteria, Escherichia coli or Bacillus of the present invention with improved resistance to short-chain fatty acids are not affected by short-chain fatty acids. Therefore, even simple equipment (for example, a jersey mentor) can be implemented.
- the method for producing a fermentation broth according to the present invention is characterized in that the cells according to claim 8 are cultured under conditions under which the cells produce short chain fatty acids.
- the cell according to claim 8 is expressed by introducing a short-chain fatty acid resistance gene into a bacterial cell belonging to the genus Acetic acid bacteria, Escherichia coli or Bacillus by the breeding method of the present invention described in [1] above.
- Bacterial cells belonging to the genus Acetic acid bacteria, Escherichia coli, or Bacillus having improved short-chain fatty acid resistance, which are bred, can be selected and used as bacterial cells having the desired ability to produce short-chain fatty acids.
- E. coli can produce all short chain fatty acids, and acetic acid bacteria can selectively produce acetic acid.
- Short chain fatty acids are formic acid, acetic acid, propylene. In addition to on acid, butyric acid, isobutyric acid, valeric acid, it also means lactic acid.
- the method for producing a fermentation broth according to the present invention requires that the bacterial cells to be cultured are cultured under conditions for producing short-chain fatty acids. Such conditions are the types of bacterial cells and the production target. Although it can be determined as appropriate depending on the type of short chain fatty acid, an appropriate amount of short chain alcohol corresponding to the short chain fatty acid is usually added.
- the acetic acid bacteria E. coli shuttle vector pGI 18 was prepared from about 3. lkb of plasmid pGI 1 and pUC 18 derived from Acetobacter altoacetigenes MH 24 strain (FERM BP 491).
- Figure 1 outlines the construction of plasmid pGI18.
- the plasmid pGIl was also prepared with the ability of Acetopacter altoacetigenes.
- the cells were collected from the culture solution of Acetobacter altoacetigenes MH-24 strain (FERM BP-491), lysed using sodium hydroxide sodium dodecyl sulfate, and then treated with phenol. Furthermore, the plasmid DNA was purified with ethanol.
- the obtained plasmid was a circular double-stranded DNA plasmid having 3 recognition sites in Hindi and 1 in Sfil, and the total length of the plasmid was about 3100 base pairs (3. Ikbp). In addition, it did not have recognition sites for EcoRI, Sacl, Kpnl, Smal, BamHI, Xbal, Sail, Pstl, Sphl, and Hindi II. This plasmid was named pGIl and used to construct the vector pGI18.
- the plasmid pGIl obtained as described above was amplified by PCR and cleaved with Aatll. This fragment was inserted into the restriction enzyme Aatll cleavage site of pUC18 (2.7 kbp, manufactured by Takara Bio Inc.) to prepare plasmid pGI18.
- the PCR method was performed as follows. Plasmid pGIl is used as a cage type, and primer A (see the nucleotide sequence described in SEQ ID NO: 10 in the sequence listing) and primer B (refer to SEQ ID NO: 11 in the sequence listing) are used as primers. Base sequence). Perform PCR with the above kite and primers using KOD-P1 Using us- (manufactured by Toyobo Co., Ltd.), it was carried out under the conditions of 30 cycles, with 94 ° C for 30 seconds, 60 ° C for 30 seconds, and 68 ° C for 3 minutes.
- the resulting plasmid pGI18 contained 11-18 and 011 as shown in FIG. 1, and the total length was about 5800 base pairs (5.8 kbp). .
- the base sequence of this plasmid pGI 18 was as shown in SEQ ID NO: 12 in the sequence listing.
- Example 1 Acetic acid excretion in a vaccine that is transformed with DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing
- PABC 1 (FIG. 12) cleaved with DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing was cleaved with the restriction enzyme Pstl, and the resulting fragment of about 2.5 Kb was prepared in Production Example 1.
- the plasmid pABClll was prepared by ligation to the restriction enzyme Pstl cleavage site of the acetic acid bacteria-E. Coli shuttle vector PGI18.
- the pABClll prepared in this way was transferred to the Acetobacter aceti No. 1023 strain (FERM BP-2287) using the electo mouth position method (“Procedures 'National' Academic ⁇ ⁇ "Science” of USA (Proc. Natl. Acad. Sci. USA) ", 87 ⁇ , p. 8130-8134 (1990)). Transformants were selected on YPG medium supplemented with 100 ⁇ g Zml ampicillin and 2% acetic acid.
- the ampicillin-resistant transformant grown on the above selection medium is extracted and analyzed by a conventional method, and a plasmid carrying the DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing is retained. ,I was sure that.
- the ampicillin resistant transformant (No. 1023 / pABClll strain) carrying the plasmid pABCl11 obtained as described above was grown in YPG medium supplemented with acetic acid, and the intracellular acetic acid concentration was determined. Comparison was made with Acetovata'Acetii No. 1023 strain (No. 1023ZpGI18 strain) into which only the shuttle vector pGI18 was introduced.
- Table 1 shows the results of intracellular potassium acetate concentration in each culture solution.
- both the transformed strain No. 1023ZpABClll and the non-transformed strain No. 1023ZpGI18 strain showed increased intracellularity as the potassium acetate concentration in the culture solution increased. had potassium acetate concentration increases, the degree of increase is transformed strain (No. 1023ZpABClll Ltd.) it is relatively slow device particularly when potassium acetate concentration of the culture of 4 wt Z capacitance 0 / o, the The No. 1023ZpABClll strain had only 84% accumulation of the No. 1023ZpGI18 strain. This indicates that in the transformed strain 1023ZpABClll, acetic acid in the cells is excreted outside the cell.
- the DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing is a gene encoding a protein having a function of discharging acetic acid from the inside of the cell to the outside of the cell.
- Example 2 Resistance to short chain fatty acids of Escherichia coli transformed with DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing
- the pABClll prepared in Example 1 was transformed into Escherichia coli JM109 according to a conventional method by an electroboration method, and a transformant was selected on an LB agar medium supplemented with 100 ⁇ g / ml ampicillin.
- Ampicillin-resistant transformants that grew on the selective medium were analyzed by extracting plasmids by a conventional method and confirmed that they retain the plasmid carrying the acetate-resistant gene.
- the transformation m3 ⁇ 4FM109ZpABCl 11 strain obtained in this way is an Deposited at the Research Center for Biological Biology (1st, 1st, 1st, 1st, Tsukuba, Ibaraki, Japan) on December 14, 2004, the deposit number is FERM BP— 10184 .
- JM109ZPABC111 For the ampicillin resistant transformant (JM109ZPABC111) having the plasmid pABCl11 obtained as described above, LB medium supplemented with formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, and valeric acid short chain fatty acids.
- the growth of E. coli was compared with E. coli (JM109ZPGI18 strain) into which only the shuttle vector pGI18 was introduced.
- LB medium pH 5.0: medium supplemented with short chain fatty acids
- ampicillin 100 / ⁇ 8 ⁇ 1 ampicillin 100 / ⁇ 8 ⁇ 1, ImM IPTG (isopropyl 1-1-thio-13-D-galactobilanoside) at 37 ° C
- JM109ZPABC The 111 strain and the JM109ZpGI18 strain were subjected to shaking culture (150 rpm).
- the same culture was performed in a non-added medium having the same composition as the medium containing short chain fatty acids except that no short chain fatty acid was added.
- the absorbance at 660 nm was measured over time, and each medium was compared as an index of the degree of growth (growth) of each cell.
- Figures 2 and 3 show the changes over time in the amount of growth (absorbance (660 nm)) in each medium.
- Escherichia coli having improved resistance to various short-chain fatty acids can be bred by introducing the DNA having the nucleotide sequence shown in SEQ ID NO: 1 of the Sequence Listing into E. coli cells.
- the PCR method was performed as follows. As a type, using genomic DNA of Acetobacter altoacetigenes MH-24 strain (FERM BP-491), and as a primer, primer 1 (refer to the nucleotide sequence described in SEQ ID NO: 13 in the sequence listing) and Primer 2 (see the nucleotide sequence described in SEQ ID NO: 14 in the sequence listing) was used. Perform PCR using the above saddle type and primers using KOD-Plus- (manufactured by Toyobo Co., Ltd.) with 30 cycles of 94 ° C for 15 seconds, 60 ° C for 30 seconds, 68 ° C for 2 minutes. It was carried out under the conditions of Kuru.
- KOD-Plus- manufactured by Toyobo Co., Ltd.
- the pABC 112 produced in this way was transferred to Escherichia coli JM109 strain by the electroporation method (Biosci. Biotech. Biochem., 58 ⁇ , 974). P. 1994). Transformants were selected on LB agar medium supplemented with 100 ⁇ g Zml ampicillin.
- the ampicillin-resistant transformant grown on the above selection medium is extracted and analyzed by a conventional method, and a plasmid carrying the DNA having the nucleotide sequence shown in SEQ ID NO: 3 in the sequence listing is retained. ,I was sure that.
- the transformed m3 ⁇ 4FM109ZpABCl 12 strain obtained in this way was transferred to the National Institute of Advanced Industrial Science and Technology, Patent Biological Depositary Center (Tsukuba Rinto, 1-chome, 1-chome, 1-cir. 6), December 14, 2004. Deposited by date, the deposit number is FERM BP-10185.
- the ampicillin resistant transformant ( ⁇ 11097 88112) having the plasmid pABCl12 obtained as described above was grown in LB medium supplemented with formic acid and acetic acid short-chain fatty acids. Comparison was made with E. coli (JM109ZPGI 18 strain) into which only the shuttle vector pGI 18 was introduced.
- the transformed strain JM109ZpABC112 was able to grow even though each short-chain fatty acid-added medium was a non-transformed strain.
- Some J M109ZpGI18 strains failed to grow. That is, the non-transformed strain (JM109ZPGI18 strain) was affected by the presence of short-chain fatty acids, whereas the transformed strain CFM109Z pABCl 12 strain) was resistant to formic acid and acetic acid! And then.
- Escherichia coli having improved resistance to short-chain fatty acids can be bred by introducing DNA having the nucleotide sequence shown in SEQ ID NO: 3 in the sequence listing into E. coli cells.
- the PCR method was performed as follows. As a type, using genomic DNA of Acetobacter altoacetigenes MH-24 strain (FERM BP-491), as a primer, primer 3 (see the nucleotide sequence described in SEQ ID NO: 15 in the sequence listing) and Primer 4 (see the nucleotide sequence described in SEQ ID NO: 16 in the sequence listing) was used. PCR with the above mold and primers using KOD-Plus-(Toyobo Co., Ltd.), 30 cycles of 94 ° C for 15 seconds, 60 ° C for 30 seconds, 68 ° C for 1 minute The conditions were as follows.
- FIG. 5 shows a restriction enzyme map of the described base sequence, the position of the base sequence described in SEQ ID NO: 5, and a schematic diagram of the inserted fragment into plasmid PABC31.
- the pABC31 prepared as described above was transformed into Escherichia coli JM109 strain by the electoral position method. Transformants were selected on LB agar medium supplemented with 100 gZml ampicillin.
- the ampicillin-resistant transformant grown on the above selection medium is extracted and analyzed by a conventional method, and a plasmid carrying the DNA having the nucleotide sequence shown in SEQ ID NO: 5 in the sequence listing is retained. ,I was sure that.
- the transformation m3 ⁇ 4FM109ZpABC31 strain obtained in this way was transferred to the National Institute of Advanced Industrial Science and Technology, Patent Biological Deposit Center (1st, 1st, 1st, 1st, 1st, Tsukuba, Ibaraki, Japan) on December 14, 2004.
- the deposit number is FERM BP-10182.
- the ampicillin resistant transformant (JM109ZPABC31) having the plasmid PABC31 obtained as described above was grown in LB medium supplemented with short-chain fatty acids of formic acid and acetic acid, and Escherichia coli into which only the shuttle vector pGI18 was introduced. (JM109ZPGI18 strain).
- C static culture or shaking culture (150 rpm) of the JM109ZpABC31 strain and the JM109ZpGI18 strain was performed.
- the absorbance at 660 nm was measured over time and used as an indicator of the degree of growth (growth) of each cell and compared between each medium added with short chain fatty acids.
- Fig. 6 shows the amount of growth (absorbance (660 nm)) in each medium.
- the transformed strain M109ZPABC31 was able to grow in any of the mediums supplemented with short chain fatty acids, whereas the E. coli strain JM109ZpGI18 was unable to grow.
- the non-transformed mtt CFM109ZpGI18 strain was affected by the presence of short-chain fatty acids, whereas the transformed ⁇ 3 ⁇ 4 (jM109ZpABC31 strain) Formic acid and acetic acid! / Resistant to discrepancy! /
- Escherichia coli having improved resistance to short-chain fatty acids can be bred by introducing the DNA having the nucleotide sequence shown in SEQ ID NO: 5 of the Sequence Listing into E. coli cells.
- the DNA shown in SEQ ID NO: 8 in the sequence listing was amplified by PCR, and the resulting fragment was ligated to the restriction enzyme Smal cleavage site of the acetic acid bacteria-E. Coli shuttle vector PGI18 prepared in Production Example 1 to obtain plasmid P ABC41. Produced.
- the PCR method was performed as follows. Using the genomic DNA of Acetobacter altoacetigenes MH-24 strain (FERM BP-491) as a cage type, and as a primer, primer 5 (refer to the nucleotide sequence described in SEQ ID NO: 17 in the sequence listing) and Primer 6 (see the nucleotide sequence described in SEQ ID NO: 18 in the sequence listing) was used. PCR using KOD-Plus- (manufactured by Toyobo Co., Ltd.) using the above saddle type and primers, with 30 cycles of 94 ° C for 15 seconds, 60 ° C for 30 seconds, 68 ° C for 1 minute It carried out on condition of this.
- KOD-Plus- manufactured by Toyobo Co., Ltd.
- the pABC41 prepared in this way was transformed into Escherichia coli JM109 strain by the electopore method. Transformants were selected on LB agar medium supplemented with 100 gZml ampicillin.
- the ampicillin-resistant transformant grown on the above selection medium is extracted and analyzed by a conventional method, and a plasmid carrying the DNA having the nucleotide sequence shown in SEQ ID NO: 8 in the sequence listing is retained. ,I was sure that.
- Acetobacterin MH A restriction map of the nucleotide sequence described in SEQ ID NO: 8 and the position of the nucleotide sequence described in SEQ ID NO: 8 in the genomic DNA of 24 strains, and a schematic diagram of the inserted fragment into plasmid PABC41 This is shown in Fig. 8.
- transformation 3 ⁇ 4JM109ZpABC41 strain was founded on December 27, 2004 at the National Institute of Advanced Industrial Science and Technology, Patent Biological Deposit Center (1st, 1st, 1st, 1st, 1st, Tsukuba, Ibaraki, Japan).
- the deposit number is FERM BP_10194.
- LB medium pH 5.0 containing 0.15% formic acid or acetic acid as a short-chain fatty acid, ampicillin 100 / gZ ml, and ImM IPTG (isopropyl 1-1j-j-galatatopyranoside) ) 37.
- the JM109 / PABC41 strain and the JM109ZpGI18 strain were subjected to static culture or shaking culture (150 rpm).
- the absorbance at 660 nm was measured over time, and was compared between the mediums supplemented with short chain fatty acids as an index of the degree of growth (growth) of each cell.
- FIG. 7 shows the amount of growth (absorbance (660 nm) over time) in each medium.
- the transformed 3 ⁇ 4IM109ZpABC41 strain was able to grow in any of the short-chain fatty acid-added media, whereas the Escherichia coli JM109 / pGI18 strain was unable to grow. That is, the non-transformed strain CiM109ZpGI18) was affected by the presence of short-chain moon fatty acid, while the transformed JM109 strain pABC41 was resistant to formic acid and acetic acid.
- Escherichia coli having improved resistance to short-chain fatty acids can be bred by introducing the DNA having the nucleotide sequence shown in SEQ ID NO: 8 of the Sequence Listing into E. coli cells.
- the transformant of E. coli strain JM109 carrying plasmid pABCl11 (JM109ZPABC111 strain) obtained in Example 2 was grown in a medium in which glucose was added to LB medium, and the E. coli strain into which only the shuttle vector pGI18 was introduced. (JM109ZPGI18 strain).
- LB medium pH 7.0
- aeration culture at 37 ° C, 500 rpm, 0.3 vvm was performed. The amount of growth during and at the end of the culture, and the amount of acetic acid and total organic acid in the culture were compared between the transformed and non-transformed strains.
- Figure 9 shows the growth of each cell and the changes in total organic acid and acetic acid in the culture.
- Table 2 summarizes the amount of growth at 22 hours after the start of culture, and the total amount of short-chain fatty acids and acetic acid in the culture solution.
- E. coli obtained by introducing DNA having the nucleotide sequence shown in SEQ ID NO: 1 of the sequence listing into E. coli cells is not subject to growth inhibition by short-chain fatty acids in high-density cell culture, and As a result, it became clear that a large amount of organic acids can be produced using only short-chain fatty acids such as acetic acid.
- a 2-liter mini jar manufactured by Mitsuru Rigaku Kogyo Co., Ltd .; KMJ-2A
- a pH controller manufactured by Mitsuru Kagaku Kogyo Co., Ltd .; digital pH controller MPH-2C
- mineral medium (2. Og Na 2 SO 4, 2. 468 g)
- Culturing was performed while controlling the temperature, pH, stirring speed, and aeration rate to be 35 ° C, 6.8, 700 rpm, and 0.51 / min, respectively.
- the pH was adjusted by adding 29% ammonia solution.
- the 50% glucose solution was continuously added until 26.5 hours, and the schedule shown in Table 3 was applied.
- the feed is fed while increasing the flow acceleration and the fed amount, and the culture is performed while performing aeration and agitation culture (aeration rate: 0.5 wm, agitation speed: 700 rpm). It was.
- the proliferation of the bacterial cells was confirmed by measuring the amount of growth at an absorbance at 660 nm (OD660 nm) and the dry weight of the bacterial cells.
- Fig. 10 shows the transition of the growth (OD660nm) in the fed-batch culture of glucose. As is clear from FIG. 10, it was confirmed that the transformed strain (JM109ZPABC111 strain) exceeded the growth potential SJM109ZPGI18 strain.
- the final cell mass dry cell weight (g: DCW (Dried Cell Wei ght)) and glucose consumption was measured, and the cell concentration (dry cell weight gZ 1 per liter of medium) The cell yield (wZw%) was calculated, and the average growth rate (gZh) was calculated as the growth rate of the cells per unit time.
- the transformed strain CiM109ZpABClll is the JM109ZpGI18 strain in terms of the amount of cells, the concentration of the cells, the yield of the cells, and the growth rate per unit time. The value was stronger.
- the pABC 111 prepared in Example 1 was transferred to the Gluconacetobacter diazotrophicus ATC C49037 strain, which is one of the acetic acid fermentation bacteria! Transformation was performed by the position method. Transformation was selected on YPG medium supplemented with 100 ⁇ g Zml ampicillin.
- the ampicillin-resistant transformant grown on the above selection medium is extracted and analyzed by a conventional method, and a plasmid carrying the DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing is retained. ,I was sure that.
- Ampicillin-resistant transformation (ATCC49037ZpABClll strain) with plasmid pABCl11 obtained as described above was grown in YPG medium supplemented with acetic acid, and darkon into which only the shuttle vector pGI18 was introduced. It was compared with Acetobacter diazotrophicus ATCC49037 strain (ATCC49037ZpGI18 strain).
- the transformant (ATCC49037ZpABClll strain) can grow on YPG medium supplemented with 0.05% acetic acid, whereas the ATCC49037 / pG118 strain It was confirmed that they could not grow. Therefore, by introducing the DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing into Dalconacetobacter diazotrophicus, which is an acetic acid bacterium that does not produce acetic acid, its acetic acid resistance is reduced. It has been shown that it can be enhanced.
- the present invention it is possible to breed cells that are imparted with resistance to short-chain fatty acids and have improved resistance to short-chain fatty acids.
- the breeding method of the present invention is applied to microbial cells, cells that are not affected by short-chain fatty acids that are harmful to the growth produced during culture can be efficiently bred.
- the microbial cells resistant to short-chain fatty acids obtained by the present invention can also be applied to high-density cell culture that produces short-chain fatty acids. It can also be used for the production of fermentation broth containing high concentrations of short-chain fatty acids. In particular, in the case of Escherichia coli or the like to which resistance to short chain fatty acids is imparted, the growth ability in culture is remarkably improved, and high concentrations of short chain fatty acids can be accumulated efficiently, which is industrially useful.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Biotechnology (AREA)
- General Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Biophysics (AREA)
- Plant Pathology (AREA)
- Medicinal Chemistry (AREA)
- Tropical Medicine & Parasitology (AREA)
- Virology (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/793,145 US20080138904A1 (en) | 2004-12-17 | 2005-12-12 | Method Of Breeding Cells To Improve Tolerance To Short Chain Fatty Acids |
EP05814767A EP1842912A4 (en) | 2004-12-17 | 2005-12-12 | METHOD FOR CELL-LIVING CELLS WITH IMPROVED TOLERANCE AGAINST SHORT-CHAINED FATTY ACIDS |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-365521 | 2004-12-17 | ||
JP2004365521 | 2004-12-17 | ||
JP2005014984A JP2006191908A (ja) | 2004-12-17 | 2005-01-24 | 短鎖脂肪酸耐性の向上した細胞の育種方法 |
JP2005-014984 | 2005-01-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006064746A1 true WO2006064746A1 (ja) | 2006-06-22 |
Family
ID=36587801
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/022742 WO2006064746A1 (ja) | 2004-12-17 | 2005-12-12 | 短鎖脂肪酸耐性の向上した細胞の育種方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080138904A1 (ja) |
EP (1) | EP1842912A4 (ja) |
JP (1) | JP2006191908A (ja) |
WO (1) | WO2006064746A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015039348A (ja) * | 2013-08-22 | 2015-03-02 | 国立大学法人 筑波大学 | 微生物変異株、当該微生物変異株を用いた廃水処理方法及び廃水処理装置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078635A1 (fr) * | 2002-03-15 | 2003-09-25 | Mitsukan Group Corporation | Gene favorisant la tolerance a l'acide acetique, bacterie d'acide acetique obtenue au moyen du gene, et procede de production de vinaigre au moyen de cette bacterie d'acide acetique |
WO2003078622A1 (fr) * | 2002-03-15 | 2003-09-25 | Mitsukan Group Corporation | Gene cyclase de squalene-hopene de bacterie acetique, bacterie acetique cultivee avec ce gene et procede de production de vinaigre au moyen de cette bacterie |
JP2003289868A (ja) * | 2002-04-01 | 2003-10-14 | Mitsukan Group Honsha:Kk | 酢酸耐性遺伝子、該遺伝子を用いて育種された酢酸菌、及び該酢酸菌を用いた食酢の製造方法 |
JP2004121021A (ja) * | 2002-09-30 | 2004-04-22 | Mitsukan Group Honsha:Kk | 酢酸耐性に関与する遺伝子、該遺伝子を用いて育種された酢酸菌、及び該酢酸菌を用いた食酢の製造方法 |
JP2004305209A (ja) * | 2003-03-27 | 2004-11-04 | Mitsukan Group Honsha:Kk | 酢酸菌の増殖促進機能に関与する遺伝子 |
JP2005040065A (ja) * | 2003-07-23 | 2005-02-17 | Mitsukan Group Honsha:Kk | タンパク質複合体abc3、その遺伝子、高度な酢酸耐性を有する微生物、及び該微生物を用いた食酢の製造方法 |
-
2005
- 2005-01-24 JP JP2005014984A patent/JP2006191908A/ja active Pending
- 2005-12-12 WO PCT/JP2005/022742 patent/WO2006064746A1/ja active Application Filing
- 2005-12-12 EP EP05814767A patent/EP1842912A4/en not_active Withdrawn
- 2005-12-12 US US11/793,145 patent/US20080138904A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003078635A1 (fr) * | 2002-03-15 | 2003-09-25 | Mitsukan Group Corporation | Gene favorisant la tolerance a l'acide acetique, bacterie d'acide acetique obtenue au moyen du gene, et procede de production de vinaigre au moyen de cette bacterie d'acide acetique |
WO2003078622A1 (fr) * | 2002-03-15 | 2003-09-25 | Mitsukan Group Corporation | Gene cyclase de squalene-hopene de bacterie acetique, bacterie acetique cultivee avec ce gene et procede de production de vinaigre au moyen de cette bacterie |
JP2003289868A (ja) * | 2002-04-01 | 2003-10-14 | Mitsukan Group Honsha:Kk | 酢酸耐性遺伝子、該遺伝子を用いて育種された酢酸菌、及び該酢酸菌を用いた食酢の製造方法 |
JP2004121021A (ja) * | 2002-09-30 | 2004-04-22 | Mitsukan Group Honsha:Kk | 酢酸耐性に関与する遺伝子、該遺伝子を用いて育種された酢酸菌、及び該酢酸菌を用いた食酢の製造方法 |
JP2004305209A (ja) * | 2003-03-27 | 2004-11-04 | Mitsukan Group Honsha:Kk | 酢酸菌の増殖促進機能に関与する遺伝子 |
JP2005040065A (ja) * | 2003-07-23 | 2005-02-17 | Mitsukan Group Honsha:Kk | タンパク質複合体abc3、その遺伝子、高度な酢酸耐性を有する微生物、及び該微生物を用いた食酢の製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1842912A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1842912A1 (en) | 2007-10-10 |
EP1842912A4 (en) | 2008-03-12 |
US20080138904A1 (en) | 2008-06-12 |
JP2006191908A (ja) | 2006-07-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Lee et al. | Comparison of recombinant Escherichia coli strains for synthesis and accumulation of poly‐(3‐hydroxybutyric acid) and morphological changes | |
Porro et al. | Replacement of a metabolic pathway for large-scale production of lactic acid from engineered yeasts | |
ES2573980T3 (es) | Materiales y métodos para la producción eficaz de ácido láctico | |
KR101511639B1 (ko) | 재조합 미생물 및 이의 사용 방법 | |
JP7125477B2 (ja) | グリシン生産能が増加された微生物及びこれを用いた発酵組成物の生産方法 | |
CN112725210B (zh) | 抑制乳酸代谢和乙醇产生的重组耐酸酵母及使用其生产乳酸的方法 | |
Wang et al. | Metabolic engineering for ethylene production by inserting the ethylene-forming enzyme gene (efe) at the 16S rDNA sites of Pseudomonas putida KT2440 | |
JP6562374B1 (ja) | 乳酸を生成するヒドロゲノフィラス属細菌形質転換体 | |
KR20210128742A (ko) | 글리세롤 생성이 억제된 재조합 내산성 효모 및 이를 이용한 젖산의 제조방법 | |
JP4627778B2 (ja) | 加水分解物原料からコハク酸を生産する方法 | |
JP2019030316A (ja) | L−リシン生産能を有する微生物及びそれを用いたl−リシンの生産方法 | |
JPWO2010032698A6 (ja) | 植物由来原料から乳酸を生産する方法及び乳酸生産細菌 | |
BRPI0811501B1 (pt) | Sistema de expressão para a produção de um ou mais polipeptídeo(s)-alvo, seu uso, e método para produção de um polipeptídeo-alvo livre de antibióticos | |
WO2004081216A1 (ja) | 酢酸菌のアルコール脱水素酵素遺伝子 | |
CN106635945B (zh) | 重组菌株及其制备方法和生产l-苏氨酸的方法 | |
CN110592084B (zh) | 一种rhtA基因启动子改造的重组菌株及其构建方法与应用 | |
ES2702930T3 (es) | Microorganismo modificado con un comportamiento de separación de biomasa mejorado | |
US20210324391A1 (en) | Recombinant microorganism, preparation method therefor and application thereof in producing coenzyme q10 | |
CN110846333A (zh) | 一种deoB基因改造的重组菌株及其构建方法与应用 | |
KR20160111947A (ko) | 재조합 미생물의 생산 방법 | |
WO2006064746A1 (ja) | 短鎖脂肪酸耐性の向上した細胞の育種方法 | |
JP2006230329A (ja) | 酢酸発酵能が増強された酢酸菌、及び該酢酸菌を用いた食酢の製造方法 | |
WO2016030373A1 (en) | Modified microorganism for improved production of fine chemicals on sucrose | |
ES2394749T3 (es) | Fermentación de bacilos moderadamente termofílicos en sacarosa | |
JP4551870B2 (ja) | 酢酸菌の増殖促進機能に関与する遺伝子及びその使用 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005814767 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11793145 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200580045764.1 Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 2005814767 Country of ref document: EP |