WO2008020654A2 - An l-glutamic acid producing bacterium and a method for producing l-glutamic acid - Google Patents
An l-glutamic acid producing bacterium and a method for producing l-glutamic acid Download PDFInfo
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- WO2008020654A2 WO2008020654A2 PCT/JP2007/066327 JP2007066327W WO2008020654A2 WO 2008020654 A2 WO2008020654 A2 WO 2008020654A2 JP 2007066327 W JP2007066327 W JP 2007066327W WO 2008020654 A2 WO2008020654 A2 WO 2008020654A2
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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
- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/14—Glutamic acid; Glutamine
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- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/24—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/24—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
- C07K14/26—Klebsiella (G)
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/24—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
- C07K14/265—Enterobacter (G)
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/24—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Enterobacteriaceae (F), e.g. Citrobacter, Serratia, Proteus, Providencia, Morganella, Yersinia
- C07K14/27—Erwinia (G)
Definitions
- An object of the present invention is to provide a bacterium which can efficiently produce L-glutamic acid, and to provide a method for efficiently producing L-glutamic acid by using the bacterium.
- Fig. 2 shows the OD attained by the r/wS-deficient strain under acidic conditions.
- the bacterium of the present invention belongs to the genus Pantoea, Enterobacter, Klebsiella or Erwinia, has the ability to produce L-glutamic acid, and has been modified by gene recombination to inactivate the rpoS gene.
- the term "ability to produce L-glutamic acid (L-glutamic acid producing ability)" refers to the ability to produce L-glutamic acid and cause accumulation of L-glutamic acid in a medium or cells of the bacterium of the present invention to such a degree that L- glutamic acid can be collected from the medium or cells when the bacterium is cultured in the medium.
- the ability to produce L-glutamic acid in the bacterium may be a native ability, or may be imparted by modifying the bacterium using mutagenesis or recombinant DNA techniques.
- Enterobacter bacteria examples include, but are not limited to, Enterobacter agglomerans, Enterobacter aerogenes, and so forth. Specifically, the strains exemplified in European Patent Publication No. 952221 can be used.
- Pantoea bacteria include, but are not limited to, Pantoea ananatis, Pantoea stewartii, Pantoea agglomerans, and Pantoea citrea. Specific examples include the following strains:
- Pantoea ananatis AJ13355 (FERM BP-6614, European Patent Publication No. 0952221) Pantoea ananatis AJ13356 (FERM BP-6615, European Patent Publication No. 0952221) Pantoea ananatis AJ 13601 (FERM BP-7207, European Patent Publication No. 0952221).
- Erwinia bacteria examples include, but are not limited to, Erwinia amylovora and Erwinia carotovora
- Klebsiella bacteria examples include Klebsiella planticola. Specific examples include the following strains: Erwinia amylovora ATCC 15580 Erwinia carotovora ATCC 15713
- Klebsiella planticola AJ13399 (FERM BP-6600, European Patent Publication No. 955368)
- Klebsiella planticola AJ 13410 (FERM BP-6617, European Patent Publication No. 955368).
- the microorganism of the present invention may have an ability to cause accumulation of L-glutamic acid in a liquid medium in an amount that exceeds the saturation concentration of L-glutamic acid when cultured under acidic conditions (henceforth also referred to as an L-glutamic acid accumulating ability under acidic conditions). This ability may be acquired via inactivation of the rpoS gene, or may be native to the microorganism. Furthermore, the ability to cause accumulation of L- glutamic acid in an amount that exceeds the saturation concentration can be imparted, particularly by employing a strain which is resistant to L-glumatic acid at a low pH, as described in European Patent Publication No. 1078989.
- the bacteria can be modified to enhance the expression of a gene encoding an enzyme involved in L-glutamic acid biosynthesis.
- transformation method examples include treating recipient cells with calcium chloride so as to increase the permeability of DNA, which has been reported for Escherichia coli K-12 (Mandel, M. and Higa, A., J. MoI. Biol., 53, 159 (1970)), preparing competent cells from cells which are at the growth phase followed by introducing the DNA thereinto, which has been reported for Bacillus subtilis (Duncan, C.H., Wilson, GA. and Young, F.E., Gene, 1, 153 (1977)), and so forth.
- Increasing the copy number of an objective gene can also be achieved by introducing multiple copies of the gene into the chromosomal DNA of a microorganism.
- homologous recombination can be carried out by targeting a sequence which exists in multiple copies on the chromosomal DNA. Sequences which exist in multiple copies on the chromosomal DNA include repetitive DNA and inverted repeats which are present at the end of a transposable element.
- An example of a vector having a temperature-sensitive replication origin effective in bacteria belonging to the family Enterobacte ⁇ aceae of the present invention is the plasmid pMAN997, described in International Patent Publication WO99/03988, and so forth. Furthermore, gene-substituted strains can be easily selected by using quinaldic acid, which is described later.
- Modifying an expression control sequence can be done in conjunction with increasing the copy number of gene, as described above.
- mutations can be introduced into the genes of the aforementioned enzymes by typical mutagenesis or genetic engineering techniques.
- Mutagenesis treatments include, for example, irradiation with X-rays or ultraviolet rays, or treatment with a mutagenesis agent such as N-methyl-N'-nitro-N-nitrosoguanidine, and so forth.
- the mutation may be introduced into the coding region of the gene encoding the enzyme protein, or into a region responsible for regulating expression, such as a promoter.
- Genetic engineering techniques include genetic recombination, transduction, cell fusion, and so forth.
- a decrease in the intracellular activity of the objective enzyme, and the degree thereof, can be confirmed by measuring the enzyme activity in a cell extract or a purified fraction thereof obtained from the candidate strain, and comparing it with that of a wild- type strain.
- 2-oxoglutarate dehydrogenase activity can be measured by the method of Reed et al. (Reed L.J. and Mukherjee B.B., Methods in Enzymology, 13, pp.55- 61 (1969)).
- Pantoea ananatis SC 17sucA (FERM BP-8646, WO2005/085419) Klebsiella planticola AJ13410 strain (FERM BP-6617, USP 6,197,559).
- the SC17sucA strain was obtained from SC 17 strain by disrupting 2-oxoglutarate dehydrogenase gene.
- the SC17strain was obtained by selecting a low-phlegm production mutant strain from AJ 13355.
- AJ13355strain was isolated from nature due to its ability to proliferate in a medium containing L-glutamic acid and a carbon source at low pH condition.
- the AJ13601 strain was obtained by introduction into the SC17sucA strain the gltA,ppc, and gdhA genes derived from Escherichia coli and the git A gene derived from Brevibacterium lactofermentum.
- the SC17sucA strain was assigned a private number of AJ417, and it was deposited at the National Institute of Bioscience and Human-Technology, Agency of Industrial Science and Technology, Ministry of Economy, Trade and Industry (currently, the International Patent Organism Depositary, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, 1-1, Higashi 1-Chome, Tsukuba-shi, Ibaraki-ken, 305-8566) on February 26, 2004 and given an accession number of FERM BP-08646.
- the bacterium of the present invention has the aforementioned ability to produce L-glutamic acid, belongs to the genus Pantoea, Enterobacter, Klebsiella or Erwinia, and has been modified to inactivate the rpoS gene by gene recombination.
- the bacterium of the present invention can be obtained by modifying a bacterium having an ability to produce L-glutamic acid and belonging to the genus Pantoea, Enterobacter, Klebsiella or Erwinia,so that the rpoS gene is inactivated by gene recombination.
- a bacterium having an ability to produce L-glutamic acid and belonging to the genus Pantoea, Enterobacter, Klebsiella or Erwinia,so that the rpoS gene is inactivated by gene recombination In the breeding of the bacterium of the present invention belonging to the genus Pantoea, Enterobacter, Klebsiella or Erwinia, either imparing the ability to produce L-glutamic acid or inactivating the rpoS gene may be performed first.
- the phrase "bacterium has been modified to inactivate the rpoS gene” means that the bacterium has been modified so that the RpoS protein does not function normally as compared with that in a unmodified strain, such as a parent strain or a wild-type strain.
- the results of the modification of the rpoS gene by gene recombination include, for example, a decrease in the number of RpoS molecules per cell as compared with that of the parent strain or a wild-type strain, no production of the RpoS protein, reduction of the activity of the RpoS protein per molecule, or the disappearance of the activity, and so forth.
- the number of RpoS molecules can be decreased by reducing the expression of the rpoS gene.
- amino acid substitutions may be introduced into the region encoding rpoS on the chromosome (Journal of Biological Chemistry, 272:8611-8617 (1997); Proceedings of the National Academy of Sciences, USA 95 5511-5515 (1998); Journal of Biological Chemistry, 266, 20833-20839 (1991)).
- the phrase "modified by gene recombination” means a deletion of a part or the entire expression control sequence, such as promoter region, or a deletion of a coding region or non-coding region of the rpoS gene on the chromosome. It may also mean insertion of other sequences into the foregoing regions using homologous recombination to reduce the intracellular rpoS activity, but not modified by usual mutagenesis using X-ray or ultraviolet irradiation or a mutagen such as N-methyl-N'-nitro- N-nitrosoguanidine.
- the rpoS gene is preferably inactivated by modification of the rpoS gene to such a degree that the function of the rpoS gene is not restored by a spontaneous mutation.
- nucleotides When modifying an expression control sequence, preferably one or more nucleotides is/are altered, more preferably two or more nucleotides are altered, particularly preferably three or more nucleotides are altered.
- region to be deleted may include the N-terminus, an internal region, the C-terminus, or the entire coding region, so long as the function of the RpoS protein is reduced or eliminated. In general, deleting longer regions more reliably results in the inactivation of the rpoS gene. Moreover, it is preferred that the reading frames upstream and downstream of the deleted region do not conform to each other.
- the insertion point When inserting a sequence into the coding region, the insertion point may be within any region in the rpoS gene. Inserting a longer region more reliably results in the inactivation of the rpoS gene. It is preferred that the reading frames upstream and downstream of the insertion site do not conform to each other.
- the sequence to be inserted is not particularly limited so long as it reduces or eliminates the function of the RpoS protein, and examples include, for example, antibiotic resistance genes and transposons carrying a gene useful for L-glutamic acid production.
- the rpoS gene on the chromosome can be modified as described above by, for example, preparing a deletion-type rpoS gene by deleting a partial sequence of the rpoS gene, transforming a bacterium with a DNA containing the deletion-type gene resulting in homologous recombination of the gene and the rpoS gene on the chromosome, and thereby substituting the deletion-type gene for the rpoS gene on the chromosome. Even if a protein is produced from the deletion-type rpoS gene, it's three-dimensional structure will be different from that of the wild-type RpoS protein, and thus the function thereof will be reduced or eliminated.
- the rpoS gene can also be inactivated via gene disruption using quinaldic acid, resulting in a double crossover recombinant strain.
- Quinaldic acid is an analogue of tetracycline, and is excreted out of cells by a tetracycline-excreting protein encoded by TnIO.
- Quinaldic acid is a weakly acidic substance, and it loses it's electric charge and takes a electorically free form under weakly acidic conditions. Therefore, it can easily pass through cell membranes.
- quinaldic acid is excreted by the tetracycline excretion system and then, the excreted quinaldic acid converts to the free form in the weakly acidic environment out of the cell, and flows into the cell again, and, as a result, the proton concentration gradient between the outside and inside of the cell disappears.
- the decrease in transcription of the rpoS gene can be confirmed by comparing the amount of rpoS mRNA with that of a wild-type strain or an unmodified strain.
- the amount of mRNA can be evaluated by Northern hybridization, RT-PCR, and so forth (Molecular Cloning, Cold spring Harbor Laboratory Press, Cold spring Harbor (USA), 2001).
- the decrease in transcription may be to any degree, so long as transcription is decreased as compared with that of a wild-type strain or an unmodified strain, it is desirably decreased to, for example, at least 75% or less, 50% or less, 25% or less, or 10% or less of the transcription in a wild-type strain or an unmodified strain, and it is particularly preferred that the rpoS gene is not expressed at all.
- the protein encoded by the rpoS gene i.e., the RpoS protein
- the protein encoded by the rpoS gene is the sigma S factor of RNA polymerase.
- RNA polymerase consists of ⁇ , ⁇ , ⁇ ', and sigma ( ⁇ ) subunits.
- the sigma factor binds to the core enzyme which includes the ⁇ , ⁇ and ⁇ ' subunits, and recognizes the promoter for the gene transcribed by the RNA polymerase.
- the "function of the RpoS protein" refers the recognition of the promoter of the gene transcribed by the RNA polymerase.
- RpoS protein from Enterobacteriaceae examples include the protein of SEQ ID NO: 2. This protein is encoded by the rpoS gene from Pantoea ananatis (SEQ ID NO: 1). Furthermore, since the nucleotide sequence of the rpoS gene may vary depending on the species or strain of bacteria belonging to the family Enterobacteriaceae, the rpoS gene may be a variant of the nucleotide sequence of SEQ ID NO: 1. Variants of the rpoS gene can be found by using the nucleotide sequence of SEQ ID NO: 1 in a BLAST search (http://blast.genome.jp/), or the like.
- RpoS protein is the protein having the amino acid sequence of SEQ ID NO: 2.
- the gene may encode the amino acid sequence of SEQ ID NO: 2, but which includes substitutions, deletions, insertions, or additions of one or several amino acid residues so long as the function of the RpoS protein is maintained.
- the number of these amino acid differences may be, for example, 1 to 20, preferably 1 to 10, more preferably 1 to 5. These differences are typically conservative mutations that allow normal production of the RpoS protein.
- a conservative mutation is a mutation wherein substitution takes place mutually among Phe, Trp, Tyr, if the substitution site is an aromatic amino acid; among Leu, He, VaI, if the substitution site is a hydrophobic amino acid; between GIn, Asn, if it is a polar amino acid; among Lys, Arg, His, if it is a basic amino acid; between Asp, GIu, if it is an acidic amino acid; and between Ser, Thr, if it is an amino acid having a hydroxyl group.
- Typical conservative mutations are conservative substitutions.
- substitutions that are considered to be conservative include: substitution of Ser or Thr for Ala, substitution of GIn, His or Lys for Arg, substitution of GIu, GIn, Lys, His or Asp for Asn, substitution of Asn, GIu or GIn for Asp, substitution of Ser or Ala for Cys, substitution of Asn, GIu, Lys, His, Asp or Arg for GIn, substitution of Asn, GIn, Lys or Asp for GIu, substitution of Pro for GIy, substitution of Asn, Lys, GIn, Arg or Tyr for His, substitution of Leu, Met, VaI or Phe for He, substitution of He, Met, VaI or Phe for Leu, substitution of Asn, GIu, GIn, His or Arg for Lys, substitution of He, Leu, VaI or Phe for Met, substitution of Trp, Tyr, Met, He or Leu for Phe, substitution of Thr or Ala for Ser, substitution of Ser or Ala for Thr, substitution of Phe or
- the rpoS gene may be a variant which hybridizes with the nucleotide sequence shown in SEQ ID NO: 1, or a probe which can be prepared from the nucleotide sequence under stringent conditions.
- Stringent conditions include those under which a specific hybrid, for example, a hybrid having homology of not less than 80%, preferably not less than 90%, more preferably not less than 95%, and still more preferably not less than 97%, and most preferably not less than 99% is formed and a hybrid having homology lower than the above is not formed.
- stringent conditions are exemplified by washing one time, preferably two or three times at a salt concentration corresponding to 6O 0 C, IxSSC, 0.1% SDS, preferably 6O 0 C, O.lx SSC, 0.1% SDS at 6O 0 C, more preferably 68 0 C, 0. IXSSC, 0.1% SDS conducted one, two, or three times.
- the length of the probe may be suitably selected depending on the hybridization conditions, and is usually 100 bp to 1 kbp.
- L-glutamic acid productivity of a microorganism can be improved by inactivating the rpoS gene in the microorganism by gene recombination as described above. Specifically, the growth of the microorganism under acidic conditions can be improved. Acidic conditions are indicated by, for example, a pH of 3 to 5, more preferably a pH of 4 to 5.
- microorganism examples include bacteria belonging to the genus Pantoea, Enterobacter, Serratia, Klebsiella, or Erwinia.
- the microorganism is preferably cultured under acidic conditions, which results in production and accumulation of L-glutamic acid accompanied with precipitation of L-glutamic acid.
- L-glutamic acid When the microorganism is able to accumulate L-glutamic acid under acidic conditions, in particular, production of L-glutamic acid can be improved by improving the growth of the microorganism under acidic conditions.
- L-glutamic acid can be produced by culturing the bacterium of the present invention in a medium to produce and cause accumulation of L-glutamic acid in the medium, and collecting L-glutamic acid from the medium.
- the chosen culture medium may be a typical medium containing a carbon source, nitrogen source, and inorganic salts as well as trace amounts of organic nutrients as required, such as amino acids and vitamins. Either a synthetic or natural medium may be used.
- the carbon and nitrogen sources used in the medium may be of any type so long as the chosen substances can be utilized by the chosen strain.
- As the carbon source saccharides such as glucose, glycerol, fructose, sucrose, maltose, mannose, galactose, starch hydrolysate, and molasses can be used.
- organic acids such as acetic acid and citric acid, or alcohols, such as ethanol, may be used alone or in combination with other carbon sources.
- ammonia ammonium salts such as ammonium sulfate, ammonium carbonate, ammonium chloride, ammonium phosphate, and ammonium acetate, nitrates, and so forth can be used.
- organic nutrients amino acids, vitamins, fatty acids, nucleic acids, and compounds containing these substances such as peptone, casamino acids, yeast extract, and soybean protein hydrolysate can be used.
- an auxotrophic mutant strain that requires an amino acid, or the like, for growth is used, the required nutrient is preferably supplemented.
- mineral salts phosphates, magnesium salts, calcium salts, iron salts, manganese salts, and so forth can be used.
- the culture is preferably performed with aeration, while the fermentation temperature is preferably controlled to be 20 to 45 °C, and the pH to be 3 to 9.
- the medium is neutralized by the addition of, for example, calcium carbonate or an alkali, such as ammonia gas.
- a substantial amount of L- glutamic acid is produced in the culture broth after 10 to 120 hours of culture under such conditions as described above.
- a vector having the tetracycline resistance gene for use in gene disruption using quinaldic acid and tetracycline resistance gene was constructed.
- the tetracycline resistance gene from TnIO was inserted into the vector.
- pUT399 has a replication origin of R6K and contains the mob region required for conjugational transfer, and it cannot be replicated in a bacterial strain which does not have ihepir gene (available from Biomedal, refer to R. Simon., et al., BIO/TECHNOLOGY NOVEMBER 1983, 784-791 (1983)).
- PCR was performed by using the chromosome of the Pantoea ananatis SC17sucA strain (FERM BP-8646) as a template and primers rpoS-Fl (SEQ ID NO: 7)/rpoS-FR (SEQ ID NO: 8), or rpoS-RF(SEQ ID NO: 9)/rpoS-Rl (SEQ ID NO: 10).
- rpoS-Fl SEQ ID NO: 7
- rpoS-FR SEQ ID NO: 8
- rpoS-RF(SEQ ID NO: 9)/rpoS-Rl SEQ ID NO: 10
- the resulting plasmid was treated with Kpnl, and the fragment (about 4.1 kb) was ligated to the Kpnl site of pUT-TnlO to obtain pUT-TnlO/ ⁇ rpoS.
- This plasmid was introduced into the Escherichia coli S17-l ⁇ -pir strain having ⁇ -pir (available from Biomedal, R. Simon, et al., BIO/TECHNOLOGY NOVEMBER 1983, 784-791 (1983)), and this plasmid was transferred from the resulting strain into the SC17sucA strain by conjugation.
- M9 minimal medium 5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride and 6 g of disodium phosphate in 1 L of pure water
- M9 minimal medium 5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride and 6 g of disodium phosphate in 1 L of pure water
- the SC17sucA strain (FERM BP-8646) with pUT-TnlO/ ⁇ rpoS incorporated into the rpoS gene site on the chromosome was obtained.
- This strain was purified on L medium (1O g of Bacto tryptone, 5 g of yeast extract, 5 g of NaCl and 15 g of agar in 1 L of pure water, pH 7.0) also containing components of minimal medium (0.5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride and 6 g of disodium phosphate in 1 L of pure water), 25 mg/L of chloramphenicol, and 12.5 mg/L of tetracycline.
- the cells were also cultured on the same medium, but without the antibiotics. Several colonies were picked up, and cultured overnight in a liquid medium having the same composition.
- the culture was diluted 100 to 10,000 times with sterilized water, and applied to a quinaldic acid plate (medium obtained by dissolving 5 g of Bacto tryptone, 5 g of yeast extract, 40 g of NaCl, 0.05 g of tetracycline and 10 g of NaH 2 PO 4 in 900 mL of purified water, adjusting the solution to pH 5.2 with KOH, mixing 20 g of agar with the solution, autoclaving the mixture at 120°C for 20 minutes, and adding 0.2 g of quinaldic acid, 13.6 mg of ZnCl 2 and 5 g of glucose dissolved in 100 mL of purified water and subjected to filter sterilization to the autoclaved mixture).
- the structure of the rpoS gene in the colonies which appeared was confirmed by PCR using primers.
- the strain having the disrupted rpoS gene was designated SC 17sucArpoS.
- the plasmid RSFPPG was constructed.
- This plasmid contains the L-glutamic acid biosynthesis genes, including prpC (International Patent Publication WO2006/051660), ppc, and gdh (European Patent Publication No. 0999282).
- Primer 1 SEQ ID NO: 13
- primer 2 SEQ ID NO: 14
- PCR was performed to obtain a fragment of about 14.9 kb.
- prpC PCR was performed by using primer 3 (SEQ ID NO: 15) and primer 4 (SEQ ID NO: 16), and the chromosomal DNA of the E. coli W3110 strain as a template to obtain a fragment of about 1.2 kb.
- Both of these PCR products were treated with BgRl and Kpnl, ligated, and then used to transform the E. coli JM 109 strain. All the colonies which appeared were collected, and plasmids were extracted from the colonies as a mixture.
- the CS deficient strain of E. coli, ME8330 was transformed with the plasmid mixture, and the cell suspension was applied to the M9 minimal medium (5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride and 6 g of disodium phosphate in 1 L of pure water) containing 50 mg/L of uracil and 5 mg/L of thiamine HCl.
- a plasmid was extracted and designated RSFPPG.
- the GIu production plasmid RSFPPG was introduced into the SC17sucArpoS strain to construct a rpoS-deficient Glu-producing bacterium, SCl 7sucArpoS/RSFPPG
- SC17sucArpoS/RSFPPG was investigated under various pH conditions.
- the SC 17sucArpoS/RSFPPG strain and the SC 17sucA/RSFPCPG strain (rpoS wild-type) were cultured overnight on a solid medium, which was prepared by adding ingredients of minimal medium to the L medium, and the cells were washed twice with sterilized water.
- the cells were inoculated into 5 mL of the minimal medium (5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride, 6 g of disodium phosphate, 100 mg of lysine hydrochloride, 100 mg of L-methionine and 100 mg of diaminopimelic acid, and 30g of L-glutamic acid in 1 L of purified water, adjusted to various pH levels with ammonia) at OD660nm of 0.05, and OD was measured over time by using the automatic OD measuring apparatus TNl 506, produced by ADVANTEC. The results are shown in Figs. 1 and 2.
- the minimal medium 5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride, 6 g of disodium phosphate, 100 mg of ly
- the SC17sucA/RSFPPG strain and the SC17sucArpoS/RSFPPG strain were cultured overnight in a medium, which was prepared by adding ingredients of minimal medium (5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride and 6 g of disodium phosphate in 1 L of pure water) and 12.5 mg/L of tetracycline to the L medium (1O g of Bacto tryptone, 5 g of yeast extract, 5 g of NaCl and 15 g of agar in 1 L of pure water, pH 7.0).
- minimal medium 5 g of glucose, 2 mM magnesium sulfate, 3 g of monopotassium phosphate, 0.5 g of sodium chloride, 1 g of ammonium chloride and 6 g of disodium phosphate in 1 L of pure water
- tetracycline 1O g of
- compositions of media (all the concentrations are final concentrations): group A: 100 g/L of sucrose, 1.2 g/L of MgSO 4 «7H 2 O, 0.2 mL/L of GDI 13 (antifoaming agent) group B: 5 g/L of (NfL t ) 2 SO 4 , 6 g/L OfKH 2 PO 4 , 6 g/L of yeast extract (Difco), 1.5 g/L of
- the ingredients were sterilized at 120°C for 20 minutes, then mixed and dispensed in a volume of 300 mL each into 1 L-volume jar fermenters.
- Feed medium 700 g/L of sucrose, 0.2 mL/L of GD 113 , sterilized at 120°C for 20 minutes
Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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BRPI0715711A BRPI0715711B1 (en) | 2006-08-18 | 2007-08-16 | methods for producing l-glutamic acid, and for enhancing the growth of a l-glutamic acid producing microorganism under acidic conditions |
CN2007800306335A CN101506347B (en) | 2006-08-18 | 2007-08-16 | L-glutamic acid-productive bacterium and method for producing L-glutamic acid |
EP07805986.2A EP2054500B1 (en) | 2006-08-18 | 2007-08-16 | An l-glutamic acid producing bacterium and a method for producing l-glutamic acid |
US12/388,133 US8222007B2 (en) | 2006-08-18 | 2009-02-18 | L-glutamic acid producing bacterium and a method for producing L-glutamic acid |
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WO2008020654A2 true WO2008020654A2 (en) | 2008-02-21 |
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Cited By (7)
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WO2010027022A1 (en) | 2008-09-05 | 2010-03-11 | 味の素株式会社 | Bacterium capable of producing l-amino acid, and method for producing l-amino acid |
WO2010027045A1 (en) | 2008-09-08 | 2010-03-11 | 味の素株式会社 | Microorganism capable of producing l-amino acid, and method for producing l-amino acid |
US8222007B2 (en) | 2006-08-18 | 2012-07-17 | Ajinomoto Co., Inc. | L-glutamic acid producing bacterium and a method for producing L-glutamic acid |
WO2013069634A1 (en) | 2011-11-11 | 2013-05-16 | 味の素株式会社 | Method for producing target substance by fermentation |
EP2948539A4 (en) * | 2013-01-24 | 2016-10-12 | Mitsui Chemicals Inc | Microorganism for production of chemicals derived from acetyl-coa |
WO2023242062A1 (en) | 2022-06-13 | 2023-12-21 | Dsm Ip Assets B.V. | Sigma factor modifications for biosynthetic production |
EP4345166A2 (en) | 2022-09-30 | 2024-04-03 | Ajinomoto Co., Inc. | Method for producing l-amino acid |
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AU756507B2 (en) * | 1998-03-18 | 2003-01-16 | Ajinomoto Co., Inc. | L-glutamic acid-producing bacterium and method for producing L-glutamic acid |
JP4427878B2 (en) | 1999-08-20 | 2010-03-10 | 味の素株式会社 | Method for producing L-glutamic acid by fermentation method with precipitation |
JP4599726B2 (en) | 2001-02-20 | 2010-12-15 | 味の素株式会社 | Method for producing L-glutamic acid |
RU2004124226A (en) * | 2004-08-10 | 2006-01-27 | Закрытое акционерное общество "Научно-исследовательский институт Аджиномото-Генетика" (ЗАО АГРИ) (RU) | USE OF PHOSPHOCETHOLASE FOR PRODUCTION OF USEFUL METABOLITES |
US7915018B2 (en) | 2004-10-22 | 2011-03-29 | Ajinomoto Co., Inc. | Method for producing L-amino acids using bacteria of the Enterobacteriaceae family |
CN101688176B (en) * | 2007-04-17 | 2013-11-06 | 味之素株式会社 | Method for production of acidic substance having carboxyl group |
JP2016165225A (en) | 2013-07-09 | 2016-09-15 | 味の素株式会社 | Method for producing useful substance |
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WO2001005939A1 (en) * | 1999-07-19 | 2001-01-25 | Ajinomoto Co., Inc. | Process for producing target substance by fermentation |
WO2003074719A2 (en) * | 2002-03-07 | 2003-09-12 | Degussa Ag | Amino acid-producing bacteria and a process for preparing l-amino acids |
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US8222007B2 (en) | 2006-08-18 | 2012-07-17 | Ajinomoto Co., Inc. | L-glutamic acid producing bacterium and a method for producing L-glutamic acid |
WO2010027022A1 (en) | 2008-09-05 | 2010-03-11 | 味の素株式会社 | Bacterium capable of producing l-amino acid, and method for producing l-amino acid |
WO2010027045A1 (en) | 2008-09-08 | 2010-03-11 | 味の素株式会社 | Microorganism capable of producing l-amino acid, and method for producing l-amino acid |
EP2336347A4 (en) * | 2008-09-08 | 2015-11-18 | Ajinomoto Kk | Microorganism capable of producing l-amino acid, and method for producing l-amino acid |
WO2013069634A1 (en) | 2011-11-11 | 2013-05-16 | 味の素株式会社 | Method for producing target substance by fermentation |
EP2948539A4 (en) * | 2013-01-24 | 2016-10-12 | Mitsui Chemicals Inc | Microorganism for production of chemicals derived from acetyl-coa |
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WO2023242062A1 (en) | 2022-06-13 | 2023-12-21 | Dsm Ip Assets B.V. | Sigma factor modifications for biosynthetic production |
EP4345166A2 (en) | 2022-09-30 | 2024-04-03 | Ajinomoto Co., Inc. | Method for producing l-amino acid |
Also Published As
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US8222007B2 (en) | 2012-07-17 |
EP2054500B1 (en) | 2016-11-23 |
US20090215131A1 (en) | 2009-08-27 |
WO2008020654A3 (en) | 2008-05-02 |
EP2054500A2 (en) | 2009-05-06 |
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