WO2011129293A1 - 1,5-ペンタンジアミンの製造方法 - Google Patents
1,5-ペンタンジアミンの製造方法 Download PDFInfo
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- WO2011129293A1 WO2011129293A1 PCT/JP2011/058987 JP2011058987W WO2011129293A1 WO 2011129293 A1 WO2011129293 A1 WO 2011129293A1 JP 2011058987 W JP2011058987 W JP 2011058987W WO 2011129293 A1 WO2011129293 A1 WO 2011129293A1
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- 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
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- C07C211/01—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms
- C07C211/02—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
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- 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
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/88—Lyases (4.)
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- C12P13/001—Amines; Imines
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- C12Y401/00—Carbon-carbon lyases (4.1)
- C12Y401/01—Carboxy-lyases (4.1.1)
- C12Y401/01018—Lysine decarboxylase (4.1.1.18)
Definitions
- the present invention relates to a method for producing 1,5-pentanediamine by fermentation.
- Polyamide (PA) is an important polymer group used as a raw material for a series of special plastics used in the automobile industry, sports industry, and lifestyle industry
- diamine is an important raw material monomer component of this polyamide.
- Diamines are condensed with dicarboxylic acids to form various polymers. At this time, the polymer properties are determined by the chain length of the diamine and dicarboxylic acid.
- Non-patent Document 1 diamines are chemically produced from petroleum-derived materials via an intermediate stage of dicarboxylic acid, or produced by chemical decarboxylation of amino acids.
- Non-patent Document 1 Considering the soaring oil prices, it is desirable to quickly switch to synthesis of diamines from renewable resources by biotechnology methods such as fermentation.
- 1,5-pentanediamine which is a diamine having 5 carbon atoms
- 1,5-pentanediamine is another name, cadaverine, and is a compound that can be a raw material monomer for polyamide.
- 1,5-pentanediamine is a polyamine that exists universally in the living body, and its biosynthetic system is being elucidated (see Non-Patent Document 2).
- -L-lysine decarboxylase hereinafter abbreviated as LDC
- Non-patent Document 1 the production method by fermentation in recombinant Escherichia coli
- Patent Document 2 the coryneform bacterium of the lysine-producing microorganism Method for further increasing lysine production capacity
- Patent Document 3 method for blocking 1,5-pentanediamine decomposition system
- Patent Document 3 the method for supplying lysine decarboxylase with a self-replicating vector
- An object of the present invention is to provide a method for producing 1,5-pentanediamine by fermentation using a microorganism having an LDC gene in the chromosome and suppressing L-lysine side production.
- the present inventor As a result of intensive research for the purpose of suppressing L-lysine by-product in the production method of 1,5-pentanediamine by fermentation, the present inventor has an LDC gene in the chromosome and 50 mU in culture. It has been found that by using coryneform bacteria that continue to have a specific activity of lysine decarboxylase greater than / mg protein for the fermentation of 1,5-pentanediamine, the side production of L-lysine can be suppressed, The present invention has been completed. That is, the present invention includes the following (1) to (12).
- (A) Promoter comprising the base sequence set forth in SEQ ID NO: 2
- (C) which is hybridized under stringent conditions with the promoter consisting of the base sequence described in SEQ ID NO: 2 or the whole or a part of its complementary strand, the sequence identity with the base sequence described in SEQ ID NO: 2 (5)
- the promoter according to any one of (1) to (4), wherein the gene encoding the lysine decarboxylase is a gene derived from E. coli. Method.
- the gene encoding lysine decarboxylase is a gene selected from any of the following (A) to (D), and encodes a protein having lysine decarboxylase activity.
- the method according to any one of (1) to (5).
- the gene (C) which is hybridized under stringent conditions with the whole or a part of the gene consisting of the base sequence described in SEQ ID NO: 1 or its complementary strand, and the same sequence as the base sequence described in SEQ ID NO: 1.
- the coryneform bacterium has a mutant aspartate kinase in which the amino acid residue at position 311 in the amino acid sequence shown in SEQ ID NO: 3 is substituted with an amino acid other than threonine.
- FIG. 4 is a graph showing changes over time in glucose concentration, lysine concentration and 1,5-pentanediamine (1,5-PD) concentration in the culture supernatant when the coryneform bacterium CG4541 strain prepared in the example of the present invention is cultured. is there.
- FIG. 3 is a graph showing changes over time in glucose concentration, lysine concentration and 1,5-pentanediamine (1,5-PD) concentration in the culture supernatant when the coryneform bacterium TM4552 strain prepared in the comparative example of the present invention is cultured. is there. It is a figure which shows a time-dependent change of the lysine decarboxylase specific activity during culture
- the lysine decarboxylase (LDC) in the present invention means an enzyme that can be converted to 1,5-pentanediamine by decarboxylation using L-lysine as a substrate, and other enzyme actions are combined. You may have.
- the LDC used in the present invention is not particularly limited. , Vibrio cholerae, Vibrio parahemolyticus, Streptomyces coelicolor, Streptomyces pirosus, Streptomyces pirosus orrodens, Eubacterium acidaminophilum, Salmonella typhimurium, Hafnia alvide, Neisseria meningide Those derived from Pyrococcus abyssi are preferably used. More preferably, it is derived from E. coli.
- the gene encoding lysine decarboxylase used in the present invention include the gene encoding lysine decarboxylase derived from the above-mentioned organism.
- a base is selected according to the codon usage of the microorganism used. The sequence may be redesigned.
- the base sequence which codes the above-mentioned biological origin lysine decarboxylase is registered into the database (GenBank).
- GenBank a gene derived from Escherichia coli is preferable, and is a gene consisting of the base sequence set forth in SEQ ID NO: 1.
- the LDC activity can be expressed by the following formula 1.
- the activity per protein amount of LDC that is, the specific activity can be calculated by the following formula 2.
- the LDC specific activity in the present invention means the specific activity per total protein of the coryneform bacterium, and can be calculated by measuring the specific activity using the total protein extracted from the coryneform bacterium. The measurement operation is specifically described in the following examples.
- the method for extracting proteins from coryneform bacteria is not limited.
- a method of combining these can be used, but a method using glass beads is preferable.
- the coryneform bacterium having a gene encoding lysine decarboxylase in the chromosome of the present invention is characterized by having an LDC specific activity of 50 mU / mg protein or more, preferably an LDC ratio of 80 mU / mg protein or more. It has an activity, and more preferably has an LDC specific activity of 180 mU / mg protein or more. In addition, as described later in the Examples, even if the LDC specific activity is 50 mU / mg protein or more at a certain point in the culture, if the specific activity subsequently decreases, the precursor L-lysine accumulates.
- the coryneform bacterium used in the invention has the above-mentioned LDC specific activity throughout the culture.
- the term “during culturing” refers to a period during which substrate sugar is consumed after inoculating coryneform bacteria into the fermentation medium, and can be confirmed by measuring the specific activity at any point during that period.
- the culture time for maintaining the LDC specific activity is 5 hours or more after the start of culture, more preferably 10 hours or more, and even more preferably 20 hours or more. There is no particular upper limit on the culture time during which the specific activity can be maintained.
- a method for increasing the copy number of a gene encoding lysine decarboxylase introduced into the chromosome of coryneform bacteria or a lysine introduced into the chromosome There are a method using a strong promoter as a promoter of a gene encoding decarboxylase, a method using a gene encoding lysine decarboxylase with improved enzyme activity, and the like. It is preferable to use a strong promoter as the promoter of the gene encoding lysine decarboxylase to be introduced into.
- the promoter used in the present invention is not particularly limited, and can be generally used as long as it can function in coryneform bacteria, and may be a promoter derived from a different species.
- Synthetic systems such as glutamate biosynthesis system glutamate dehydrogenase gene, glutamine synthesis system glutamine synthase gene, lysine biosynthesis system aspartokinase gene, threonine biosynthesis system homoserine dehydrogenase gene, isoleucine and valine biosynthesis Acetohydroxy acid synthase gene, leucine biosynthesis system 2-isopropylmalate synthase gene, proline and arginine biosynthesis system glutamate kinase gene, histidine biosynthesis system phosphoribosyl-ATP pyrophosphorylase gene, trypto Deoxyarabinohepturonic acid phosphate (DAHP) synthase genes of aromatic amino acid biosynthetic systems such as guanine, tyrosine and pheny
- promoters that function in the logarithmic growth phase include divIVA, gap, ldhA, fda, glyA, cysK, aroF, gpmA, eno, fumC, pfk, sdhA, mdh, argF, proA, proC, aceE, serA, metE. , NifS1, tpi, aceD, cysD, sdhB or pck gene promoter, among which the divIA gene promoter is preferred, and specifically, the promoter having the base sequence described in SEQ ID NO: 2 is particularly preferred.
- the base sequence of the gene encoding the promoter sequence and lysine decarboxylase As long as it has the function as the base sequence of the gene encoding the promoter sequence and lysine decarboxylase, one or several base substitutions, deletions, insertions or additions in each base sequence. Sequences are also included. Here, “several” is usually 1 to 40, preferably 1 to 30, more preferably 1 to 20, more preferably 1 to 9, and further preferably about 1 to 5.
- the promoter sequence and the base sequence encoding lysine decarboxylase have the function, the base sequence or the base sequence that hybridizes with the whole or a part of the complementary strand under stringent conditions Is mentioned.
- the “polynucleotide hybridizing under stringent conditions” means, for example, any one of the continuous sequences of at least 20, preferably 25, more preferably at least 30 of the original base sequence.
- a known hybridization technique (Current Protocols I Molecular Biology edit. Ausbel et al., (1987) Publisher. John Wily & Sons Section 6.3-6.4) and the like. It is a base sequence to be hybridized.
- stringent conditions include, for example, a hybridization temperature of 37 ° C. in the presence of 50% formamide, 42 ° C. as a more severe condition, and 65 ° C. as a more severe condition.
- sequence identity is usually 80% or more, Preferably it is 90% or more, More preferably, it is 95% or more, More preferably May be a base sequence having 99% or more.
- sequence identity is such that two base sequences are arranged so that the number of matching bases is maximized (a gap is inserted if necessary), and the number of matching bases is the number of bases in the full-length sequence. It means a value obtained by dividing by (the number of bases of the longer sequence when the number of all bases differs between the two sequences).
- Such homology calculations can be easily performed by well-known software such as BLAST.
- Such a promoter and a base sequence encoding lysine decarboxylase can be obtained from other than coryneform bacteria, and a base sequence obtained from coryneform bacteria can be obtained by in vitro mutation treatment or site-specific treatment known to those skilled in the art. It can also be obtained by subjecting to a mutation.
- the method for introducing the promoter and lysine decarboxylase-encoding base sequences into coryneform bacteria is not particularly limited, and can be introduced by electroporation (Bio / Technology, (1989), 7, 1067-1070). it can.
- the coryneform bacterium is an aerobic gram-positive gonococcus and has been conventionally classified into the genus Brevibacterium, but now includes bacteria integrated into the genus Corynebacterium (Int. J. Syst. Bacteriol). (1981) 41, p. 225). In addition, it includes Brevibacterium bacteria that are very closely related to the genus Corynebacterium. Examples of such coryneform bacteria include Corynebacterium acetoacidophilum, Corynebacterium acetoglutamicum, Corynebacterium colactorium, Corynebacterium.
- each coryneform bacterium includes Corynebacterium acetoacidophilum ATCC 13870, Corynebacterium acetoglutamicum ATCC 15806, Corynebacterium alkanolyticum ATCC 21511, Corynebacterium carnae ATCC 15991, Corynebacterium Umm Glutamicum ATCC13020, ATCC13020, ATCC13060, Corynebacterium lilium ATCC15990, Corynebacterium melacecola ATCC17965, Corynebacterium efficiens AJ12340 (Deposit number: FERM BP-1539), Corynebacterium herculis brevis ATCC13838 Divali Katam ATCC1 020, Brevibacterium flavum ATCC13826, ATCC14067, AJ12418 (deposit number: FERM BP-2205), Brevibacterium inmariophyllum ATCC14068, Brevibacterium lactoferment
- coryneform bacteria can be sold, for example, from the American Type Culture Collection. That is, the registration number corresponding to each strain is given, and this registration number is described in the catalog of the American Type Culture Collection, and the distribution of each strain can be received with reference to this number.
- the coryneform bacterium having a gene encoding lysine decarboxylase in the chromosome used in the method for producing 1,5-pentanediamine of the present invention improves the productivity of L-lysine, which is a precursor of 1,5-pentanediamine.
- Coryneform bacterium is preferable.
- There is no limitation on the method for improving L-lysine productivity of coryneform bacteria and a known method can be used. For example, as described in Japanese Patent Application Laid-Open No.
- the coryneform bacterium preferably has an aspartate kinase that is desensitized to feedback inhibition by L-lysine.
- an aspartate kinase that is desensitized to feedback inhibition by L-lysine.
- SEQ ID NO: 3 It is more preferable to have a mutant aspartate kinase in which the 311th amino acid residue is substituted with an amino acid other than threonine.
- the homoserine dehydrogenase activity is preferably reduced or deleted, and the homoserine dehydrogenase gene is disrupted or disrupted by gene insertion mutation. More preferably, it lacks homoserine dehydrogenase activity.
- batch culture fed-batch culture or continuous culture
- continuous culture it is preferable to perform continuous culture as described in, for example, JP-A-2008-104453.
- a normal nutrient medium containing a carbon source, a nitrogen source, inorganic salts and the like can be used.
- the carbon source for example, sugars such as glucose, fructose, sucrose, maltose and starch hydrolysate, alcohols such as ethanol, and organic acids such as acetic acid, lactic acid and succinic acid can be used.
- Nitrogen sources include ammonia, ammonium chloride, ammonium sulfate, ammonium carbonate, ammonium acetate and other inorganic and organic ammonium salts, urea, other nitrogen-containing compounds, meat extract, yeast extract, corn steep liquor, soybean hydrolysate Nitrogen-containing organic substances such as can be used.
- potassium monohydrogen phosphate potassium dihydrogen phosphate
- ammonium sulfate sodium chloride
- magnesium sulfate calcium carbonate and the like
- trace nutrient sources such as biotin, thiamine, and vitamin B6 can be added as necessary.
- micronutrient sources can be substituted with medium additives such as meat extract, yeast extract, corn steep liquor, casamino acid and the like.
- the culture conditions are not particularly limited, and are performed under aerobic conditions such as shaking culture and deep aeration and agitation culture.
- the culture temperature is generally 25 ° C to 42 ° C, preferably 28 ° C to 38 ° C.
- the culture time is usually 1 day to 10 days.
- ammonia, hydrochloric acid or dicarboxylic acid is preferably used, and dicarboxylic acid is more preferably used.
- the culture pH is controlled to 5 to 8, preferably pH 6.5 to 7.5, using these neutralizing agents.
- limiting in the state of a neutralizing agent It uses by gas, a liquid, solid, or aqueous solution. Particularly preferred is an aqueous solution.
- the dicarboxylic acid preferably used as a neutralizing agent is a dicarboxylic acid substantially free of a functional group other than the two carboxyl groups.
- the functional group here means an amino group, a carboxyl group or the like during a polyamide polymerization reaction (reaction conditions are, for example, a reaction temperature of 250 to 270 ° C., a pressure of 10 to 20 kg / cm 2 and a reaction time of 1 to 5 hours).
- acidic groups sulfonic acid groups, phosphoric acid groups, phenolic hydroxyl groups, etc.
- basic groups hydrazino groups, etc.
- protonic polar groups hydroxyl groups, etc.
- cleavable groups epoxy groups, peroxy groups, etc.
- Oxidation groups, etc. and other highly reactive groups (isocyanate groups, etc.).
- halogen substituents, aromatic substituents, ether groups, ester groups, amide groups, and the like have low reactivity and do not correspond to the functional groups mentioned here.
- the dicarboxylic acid is more preferably a dicarboxylic acid represented by the following general formula (1), (2) or (3).
- the dicarboxylic acid is more preferably adipic acid, sebacic acid, 1,12-dodecanedicarboxylic acid, succinic acid, isophthalic acid, or terephthalic acid.
- 1,5-pentanediamine in the culture medium exists as a free form of 1,5-pentanediamine or a 1,5-pentanediamine salt.
- a method for collecting 1,5-pentanediamine in the culture solution first, microorganisms are removed from the culture solution. At that time, microorganisms grow and fermentation proceeds sufficiently to produce 1,5-pentanediamine, and then the cells and culture supernatant are separated (separation methods include precipitation removal, centrifugation, and membrane filtration separation). Or the bacterial cells may be separated, held or fixed from the beginning with a holding material or the like.
- 1,5-pentanediamine As a method for collecting 1,5-pentanediamine from the culture solution containing 1,5-pentanediamine from which the bacterial cells have been removed in this way, as described in JP-A-2009-207495, 1,5-pentanediamine is used. It can also be collected by crystallization as a pentanediamine dicarboxylate. Further, as described in JP-A-2009-29872, 1,5-pentanediamine can be purified and collected using an NF membrane. Further, as described in JP-A-2009-28045, 1,5-pentanediamine can be collected by extraction with a polar organic solvent and distillation.
- Sample pretreatment 25 ⁇ l of analytical sample, 25 ⁇ l of 1,4-diaminobutane (0.03 M), 150 ⁇ l of sodium hydrogen carbonate (0.075 M) as an internal standard, and ethanol of 2,4-dinitrofluorobenzene (0.2 M) The solution is added and mixed and incubated at 37 ° C. for 1 hour. After dissolving 50 ⁇ l of the reaction solution in 1 ml acetonitrile, 10 ⁇ l of the supernatant after centrifugation at 10,000 rpm for 5 minutes was analyzed by HPLC.
- Example 1 and Comparative Example 1 Preparation of Corynebacterium glutamicum capable of producing L-lysine by fermentation Aspartokinase (AK) was used to prepare Corynebacterium glutamicum capable of synthesizing L-lysine, a precursor of 1,5-pentanediamine.
- An L-lysine fermenting bacterium was prepared by introducing an effective mutation into. Appl. Microbiol. Biotechnol. , (2002), 58, p.
- a Corynebacterium glutamicum AK-1 (hereinafter abbreviated as AK-1 strain) strain was prepared with reference to the method described in 217-223. That is, this operation was specifically performed as follows.
- oligonucleotide designed with reference to the nucleotide sequence of the AK gene (Accession No. BA00000036) registered in the database (GenBank) using a genomic DNA solution prepared from Corynebacterium glutamicum ATCC13032 according to a conventional method as an amplification template PCR was performed using SEQ ID NOs: 4 and 5) as a primer set, and the resulting product was subjected to 1% agarose gel electrophoresis, and a DNA fragment of about 1.3 kb containing the AK gene was excised from the gel and purified by Gene Clean Kit. did.
- This fragment was digested with BamHI and SphI, and the resulting 1.3 kb BamHI-SphI fragment was ligated into the BamHI / SphI gap of pUC19 that had been previously digested with BamHI and SphI.
- the obtained plasmid is designated as pTM47. It was confirmed by sequence that the obtained AK gene was the same as the gene sequence registered in the database.
- pTM49-1 a plasmid introduced with the target mutation was obtained, and this was designated as pTM49-1.
- This pTM49-1 was cleaved with SphI and BamHI, and then the AK gene portion (about 1.3 kb) was gel-extracted to purify the mutated AK gene.
- PCR was performed using the bacterial cells of Bacillus subtilis IFO13719 strain as a template and the nucleotide sequences shown in SEQ ID NOs: 8 and 9 as primer sets to amplify the sacB gene.
- the obtained PCR product was cleaved with SacI, and then ligated to pHSG298 (a pUC-type commercially available plasmid having a kanamycin resistance gene as a selection marker, manufactured by Takara Bio Inc.) that had been cleaved in advance with SacI.
- the obtained plasmid is designated as pTM38.
- pTM38 cleaved with SphI and BamHI was ligated with the fragment containing the AK gene.
- the plasmid having the sacB gene and the mutant AK gene thus prepared is designated as pTM52.
- the pTM52 produced as described above in the ATCC 13032 strain was electroporated [FEMS Microbiology Letters, 65, p. 299 (1989)] and added with kanamycin (25 ⁇ g / ml) LB (tryptone (10 g / l) (manufactured by Bacto), yeast extract (5 g / l) (manufactured by Bacto), sodium chloride ( 10 g / l)) Transformants were selected on agar medium. Subsequently, the selected kanamycin resistant corynebacterium was cultured on a sucrose-added medium, and the sucrose resistant corynebacterium was selected by double crossing over.
- a genomic DNA solution was prepared from a strain capable of growing on a minimal medium containing 20 mM S-aminoethylcysteine (AEC) according to a conventional method.
- AEC S-aminoethylcysteine
- the genomic DNA was used as a template and PCR was performed using oligonucleotides (SEQ ID NOs: 4 and 5) as primer sets, the sequence of the AK gene was confirmed. The sequence from 931 to 933 was replaced with atg. I was able to confirm.
- the AK-1 strain aspartokinase prepared in this manner is desensitized to feedback inhibition by lysine and threonine. Therefore, L-lysine can be synthesized by culture.
- the obtained AK-1 strain was further genetically modified to produce a coryneform bacterium having 1 copy of the LDC gene derived from Escherichia coli in the chromosome and a coryneform bacterium having 2 copies by the method described below.
- PCR was performed using pHSG298 as a template and oligonucleotides having the nucleotide sequences shown in SEQ ID NOs: 10 and 11 as primer sets to amplify the promoter of the kanamycin resistance gene.
- this PCR product was cleaved with restriction enzymes BamHI and KpnI, followed by gel extraction to purify the promoter (Kmp) of the kanamycin resistance gene.
- vector pUC19 was cleaved with BamHI and KpnI, and then pUC19 was purified by gel extraction.
- the promoters of pUC19 and kanamycin resistance gene cleaved with BamHI and KpnI were ligated.
- the plasmid thus prepared was designated as pKmp.
- PCR was carried out using the cells of Escherichia coli JM109 strain as a template and oligonucleotides having the nucleotide sequences shown in SEQ ID NOs: 12 and 13 as primer sets to amplify the LDC gene.
- the LDC gene was purified by gel extraction.
- the plasmid pKmp was cut with NcoI and SacI, and then pKmp was purified by gel extraction. These pKmp and LDC genes cleaved with NcoI and SacI were ligated.
- the plasmid thus prepared was designated as pTM24.
- PCR was carried out using the ATCC13032 strain as a template and oligonucleotides having the nucleotide sequences shown in SEQ ID NOs: 14 and 15 as primer sets to amplify the hom gene.
- the amplified hom gene was cleaved with restriction enzymes SphI and BamHI, followed by gel extraction to purify the hom gene.
- pTM38 was purified by gel extraction. These pTM38 and hom genes cleaved with SphI and BamHI were ligated.
- the plasmid thus prepared was designated as pTM44.
- PCR was performed using plasmid pTM24 as a template and oligonucleotides having the nucleotide sequences shown in SEQ ID NOs: 16 and 17 as primer sets to amplify the Kmp-LDC gene fragment.
- the amplified Kmp-LDC gene fragment was cleaved with the restriction enzyme Aor51HI, and then gel extraction was performed to purify the Kmp-LDC gene fragment.
- PTM44 prepared as described above was cleaved with Aor51HI, and then purified by gel extraction. These pTM44 and Kmp-LDC gene fragments cleaved with Aor51HI were ligated.
- the plasmid thus prepared was designated as pTM45.
- plasmid pTM45 was transferred to AK-1 strain by electroporation [FEMS Microbiology Letters, 65, p. 299 (1989)] and selecting a kanamycin resistant strain, the kanamycin resistant strain was cultured on a sucrose-added medium, Biosci. Biotechnol.
- the sucrose-resistant corynebacterium from which the sacB gene was eliminated was selected by the double crossing over method described as a method for preparing the TM45 strain in Biochem (2007), 71 (9), 2130-5.
- a genomic DNA solution was prepared from the thus selected transformant according to a conventional method.
- PCR was carried out using this genomic DNA as a template and oligonucleotides (SEQ ID NOs: 18 and 19) as primer sets, and the resulting product was electrophoresed on a 1.0% agarose gel. One band was observed. From this, it was confirmed that the selected transformant had the LDC gene inserted into the hom locus.
- This transformant was named Corynebacterium glutamicum TM4552 strain (abbreviated as TM4552 strain).
- PCR was performed using the genomic DNA of the ATCC13032 strain prepared according to a conventional method as a template, and oligonucleotides having the nucleotide sequences shown in SEQ ID NOS: 21 and 22 as primer sets, and Pdiv was cloned.
- KOD-plus polymerase manufactured by Toyobo Co., Ltd.
- a 50 ⁇ l reaction system was prepared so that the primer was 20 pmol / sample and KOD-Plus polymerase was 1 unit / sample.
- the reaction solution was thermally denatured at 94 ° C.
- PCR amplification device iCycler manufactured by BIO-RAD
- 94 ° C. thermal denature
- 60 ° C. primer annealing
- 68 ° C extension of complementary strand
- 30 cycles of 30 seconds followed by cooling to a temperature of 4 ° C.
- the gene amplification primers (SEQ ID NOs: 21 and 22) were prepared such that a BamHI recognition sequence was added to the 5 terminal side and an NcoI recognition sequence was added to the 3 terminal side, respectively.
- the PCR-amplified fragment was purified, and the end was phosphorylated with T4 nucleotide Kinase (manufactured by Takara Bio Inc.), and then ligated to the pUC118 vector (which was cleaved with the restriction enzyme HincII and the cut surface was dephosphorylated). Ligation was performed using DNA Ligation Kit Ver.2 (Takara Bio Inc.). The ligation solution was transformed into competent cells of Escherichia coli DH5 ⁇ (manufactured by Takara Bio Inc.) and plated on an LB plate containing 50 ⁇ g / mL of the antibiotic ampicillin and cultured overnight.
- plasmid DNA was collected with a miniprep, cut with restriction enzymes BamHI and NcoI, and a plasmid into which the Pdiv fragment had been inserted was selected. All of these series of operations were performed according to the attached protocol.
- the plasmid thus prepared is designated as pCG5.
- the LDC gene was cloned by a PCR method using Escherichia coli JM109 strain as a template.
- the PCR amplification reaction is performed in the same manner as described above, and the NcoI recognition sequence is added to the 5 terminal side and the SacI recognition sequence is added to the 3 terminal side of the gene amplification primers (SEQ ID NOs: 23 and 24).
- SEQ ID NOs: 23 and 24 Made.
- the obtained PCR amplified fragment containing the LDC gene was purified and cloned into pUC118 in the same manner as described above.
- the prepared plasmid is designated as pCG11.
- pCG11 was cleaved with restriction enzymes NcoI and XbaI, a fragment of about 2.1 kb containing the LDC gene was excised and purified, and then ligated to pCG5 which had been cleaved with restriction enzymes NcoI and XbaI in advance.
- the obtained plasmid having a fragment with the LDC gene linked downstream of Pdiv is designated as pCG13.
- pCG13 was cleaved with restriction enzymes BamHI and XbaI, an approximately 2.4 kb fragment containing the Pdiv-LDC gene was excised and purified, and the above-described pTM38 was previously cleaved with restriction enzymes BamHI and XbaI. Ligated to The obtained plasmid is designated as pCG33.
- pCG29 was cleaved with restriction enzymes SalI and SphI, and a fragment containing the 3-terminal region of the LDH gene was excised and purified, and then ligated to pCG33 that had been cleaved with restriction enzymes SalI and SphI in advance.
- the obtained plasmid is designated as pCG37.
- pCG28 was cleaved with restriction enzymes BglII and BamHI, a fragment containing the 5-terminal region of the LDH gene was excised and purified, and then ligated to pCG37 previously cleaved with restriction enzymes BglII and BamHI.
- the obtained plasmid is designated as pCG41.
- a genomic DNA solution was prepared from the thus selected transformant according to a conventional method. PCR was performed using this genomic DNA as a template and oligonucleotides (SEQ ID NO: 25, 28) as primer sets, and the resulting product was electrophoresed on a 1.0% agarose gel. A single band was observed. In addition, about 2 kb fragment is obtained in the pCG41 non-introduced strain. From this, it was confirmed that the selected transformant had the Pdiv-LDC gene fragment inserted at the LDH locus. This transformant was named Corynebacterium glutamicum CG4541 strain (abbreviated as CG4541 strain).
- One platinum loop of each of CG4541 strain (Example 3) and TM4552 strain (Comparative Example 1) was inoculated into 5 mL of the sterilized medium shown in Table 1 and cultured at 30 ° C. for 24 hours in advance.
- the pre-culture was preincubated by inoculating the whole culture in 45 ml of the same medium as the pre-culture and culturing at 30 ° C. and 120 rpm for 24 hours.
- the whole culture medium was inoculated into 1000 ml of the medium whose glucose concentration in the medium shown in Table 1 was changed to 150 g / L, and sterilized air was aerated at 0.07 vvm while stirring at 30 ° C. and a stirring blade speed of 800 rpm.
- the culture was performed while adjusting the pH to 6.7.
- As a neutralizing agent sulfuric acid aqueous solution (3M) and aqueous ammonia (3M) were used.
- the culture results of the CG4541 strain are shown in FIG. 1, and the TM4552 strain is shown in FIG.
- the TM4552 strain (Comparative Example 1) reached its peak in the middle of 1,5-pentanediamine accumulation, and the precursor L-lysine accumulated, whereas the CG4541 strain (Example 1). 1, the accumulation concentration of 1,5-pentanediamine was improved to 10 g / L or more, and the precursor L-lysine did not accumulate at all.
- the culture solution of each strain cultured as described above was sampled over time, collected by centrifugation at 4000 rpm for 5 minutes, and then suspended in 2 ml of buffer (50 mM Tris-HCl, pH 8).
- buffer 50 mM Tris-HCl, pH 8
- 0.4 g / piece of glass beads 0.1 mm ⁇ , manufactured by ASONE was added, and 1 ml of the cell suspension was added thereto.
- the supernatant is recovered by centrifugation at 12000 rpm for 5 minutes, and the recovered supernatant is used as a crude enzyme solution. Then, it was used for the specific activity measurement test of lysine decarboxylase. Moreover, the BCA protein assay kit was used for the measurement of protein concentration (manufactured by PIERCE). Table 2 shows the protein concentration in the crude enzyme solution of CG4541 strain, and Table 3 shows the protein concentration in the crude enzyme solution of TM4552 strain.
- the LDC specific activity of the TM4552 strain decreased with the progress of the culture, and almost no confirmation was possible at 90 hours after the start of the culture.
- the LDC specific activity of the CG4541 strain tended to decrease as the culture progressed, the specific activity remained at 180 mU / mg protein or more throughout the culture.
- Table 5 shows the LDC specific activity of CG4541 strain and 1,5-pentanediamine and L-lysine concentrations in the culture solution.
- Table 5 shows the LDC specific activity of TM4552 strain and 1,5-pentanediamine and L-lysine concentration in the culture solution. It is shown in FIG.
- the TM4552 strain had an LDC specific activity of 83 mU / mg protein at 25 hours after the start of culture, and there was no accumulation of L-lysine in the culture solution, whereas 45 hours after the start of culture. Then, the LDC specific activity decreased to 39 mU / mg protein, and accumulation of L-lysine occurred in the culture medium. Thereafter, the specific activity of LDC decreased and the accumulation of L-lysine increased. On the other hand, from the results of Table 5, the CG4541 strain maintained an LDC specific activity of 180 mU / mg protein during culture, and no L-lysine was accumulated in the culture medium during the culture.
- the CG4541 strain uses the kanamycin resistance gene and divIVA gene promoters as LDC gene expression promoters, but the TM4552 strain using only the kanamycin resistance gene promoter has an LDC specific activity of about 80 mU / mg protein even at the highest point. Therefore, the LDC specific activity persistence of the CG4541 strain seems to be an effect of the promoter of the divIVA gene.
- the present invention is useful as a method for producing 1,5-pentanediamine which can be a raw material for polyamide.
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Abstract
Description
(2) 染色体中にリジン脱炭酸酵素をコードする遺伝子を有するコリネ型細菌による1,5-ペンタンジアミンの製造方法であって、該リジン脱炭酸酵素をコードする遺伝子が対数増殖期に機能するプロモーター下流に連結されていることを特徴とする、1,5-ペンタンジアミンの製造方法。
(3) 前記プロモーターがdivIVA遺伝子プロモーターであることを特徴とする、(2)に記載の方法。
(4)前記プロモーターが下記(A)~(D)のいずれかから選ばれるプロモーターであることを特徴とする、(2)または(3)に記載の方法。
(A)配列番号2に記載の塩基配列からなるプロモーター
(B)配列番号2に記載の塩基配列において、1もしくは数個の塩基が置換、欠失、挿入および/または付加された塩基配列からなるプロモーター
(C)配列番号2に記載の塩基配列からなるプロモーターもしくはその相補鎖の全体またはその一部とストリンジェントな条件でハイブリダイズするプロモーター
(D)配列番号2に記載の塩基配列との配列同一性が少なくとも80%以上の塩基配列からなるプロモーター
(5) 前記リジン脱炭酸酵素をコードする遺伝子が大腸菌由来の遺伝子であることを特徴とする、(1)~(4)のいずれかに記載の方法。
(6) 前記リジン脱炭酸酵素をコードする遺伝子が下記(A)~(D)のいずれかから選ばれる遺伝子であってリジン脱炭酸酵素活性を有するタンパク質をコードするものであることを特徴とする、(1)~(5)のいずれかに記載の方法。
(A)配列番号1に記載の塩基配列からなる遺伝子
(B)配列番号1に記載の塩基配列において、1もしくは数個の塩基が置換、欠失、挿入および/または付加された塩基配列からなる遺伝子
(C)配列番号1に記載の塩基配列からなる遺伝子もしくはその相補鎖の全体またはその一部とストリンジェントな条件でハイブリダイズする遺伝子
(D)配列番号1に記載の塩基配列との配列同一性が少なくとも80%以上の塩基配列からなる遺伝子。
(7) 前記コリネ型細菌が、L-リジン生産性の向上したコリネ型細菌であることを特徴とする、(1)~(6)のいずれかに記載の方法。
(8) 前記コリネ型細菌が、配列番号3に記載のアミノ酸配列において311番目のアミノ酸残基がスレオニン以外のアミノ酸に置換された変異型アスパラギン酸キナーゼを有することを特徴とする、(1)~(7)のいずれかに記載の方法。
(9) 前記コリネ型細菌のホモセリンデヒドロゲナーゼ活性が低下または欠損していることを特徴とする、(1)~(8)のいずれかに記載の方法。
(10) 前記コリネ型細菌が、遺伝子挿入変異によってホモセリンデヒドロゲナーゼ活性を欠損していることを特徴とする、(9)に記載の方法。
(11) 前記コリネ型細菌がコリネバクテリウム属(Genus Corynebacterium)に属する細菌であることを特徴とする、(1)~(10)のいずれかに記載の方法。
(12) 前記コリネバクテリウム属(Genus Corynebacterium)に属する細菌がコリネバクテリウム・グルタミカム(Corynebacterium glutamicum)であることを特徴とする、(11)に記載の方法。
HOOC-(CH2)m-COOH (1)
(但し、一般式(1)において、m=0~16)。
使用カラム:CAPCELL PAK C18(資生堂)
移動相:0.1%(w/w)リン酸水溶液:アセトニトリル=4.5:5.5
検出:UV360nm
(1) L-リジンを発酵生産できるコリネバクテリウム・グルタミカムの作製
1,5-ペンタンジアミンの前駆体であるL-リジンを合成できるコリネバクテリウム・グルタミカムを作製するため、アスパルトキナーゼ(AK)への有効変異導入によるL-リジン発酵菌を作製した。Apppl.Microbiol.Biotechnol.,(2002),58,p.217-223に記載の方法を参考に、コリネバクテリウム・グルタミカム AK-1(以下AK-1株と略す)株を作製した。すなわち、この操作は具体的に次のようにして行った。
AK-1株を1,5-ペンタンジアミン発酵菌に改良するために、大腸菌由来のLDC遺伝子をホモセリンデヒドロゲナーゼ遺伝子座に導入するためのプラスミドpTM45を作製した。すなわち、この操作は具体的に次のようにして行った。
次にLDC遺伝子を乳酸脱水素酵素遺伝子(LDH遺伝子)座に導入するためのプラスミドを作製した。
LDC遺伝子の発現プロモーターとしてATCC13032株のdivIVA遺伝子(配列番号20)のプロモーター(配列番号2、Pdivと略す)を用いた。
LDH遺伝子座に導入するための相同領域として、それぞれ500bpのLDH遺伝子5末端および3末端領域のクローニングを行った。それぞれ、ATCC13032株のゲノムを鋳型として、配列番号25,26(5末端領域)および配列番号27,28(3末端領域)をプライマーセットとして、上記と同様な方法でPCRを行った。なお、5末端領域増幅用プライマー(配列番号25,26)には、5末端側および3末端側にBglII認識配列がそれぞれ付加されるようにして作製し、3末端領域増幅用プライマー(配列番号27,28)には、5末端側にはSalI認識配列、3末端側にはSphI認識配列が負荷されるようにして作製した。得られたLDH遺伝子の5末端および3末端領域を含む約500bpのPCR増幅断片をそれぞれ精製し、上記と同様な方法でpUC118にそれぞれクローニングした。作製したプラスミドをpCG28(5末端領域)およびpCG29(3末端領域)とする。
先に作製した上記TM4552株に上記のようにして作製したpCG41を導入し、カナマイシン(25μg/ml)が添加されているLB(トリプトン(10g/l)(Bacto社製)、酵母エキス(5g/l)(Bacto社製)、塩化ナトリウム(10g/l))寒天培地上で形質転換体を選択した。続いて選択したカナマイシン耐性コリネ菌をスクロース添加培地上で培養し、実施例1と同様にダブルクロッシングオーバーによりスクロース耐性コリネ菌を選択した。こうして選択された形質転換体から常法に従いゲノムDNA溶液を調整した。このゲノムDNAを鋳型として、オリゴヌクレオチド(配列番号25,28)をプライマーセットとして用いたPCR法を行い、得られた産物を1.0%アガロースゲルにて電気泳動したところ、約3.3kbの単一のバンドが観察された。なお、pCG41未導入株では約2kbの断片が得られる。このことから、選択された形質転換体が、LDH遺伝子座に、Pdiv-LDC遺伝子断片が挿入されていることが確認できた。この形質転換体を、コリネバクテリウム・グルタミカムCG4541株(CG4541株と略す)と命名した。
上記のとおり作製したTM4552株(比較例1)およびCG4541株(実施例1)を用いて1,5-ペンタンジアミン発酵試験を行った。
上記のとおり培養したCG4541株(実施例1)およびTM4552株(比較例1)のLDC比活性を経時的に測定した。
Claims (12)
- 染色体中にリジン脱炭酸酵素をコードする遺伝子を有するコリネ型細菌による1,5-ペンタンジアミンの製造方法であって、前記コリネ型細菌が培養中に50mU/mg protein以上のリジン脱炭酸酵素活性を有し続けていることを特徴とする、1,5-ペンタンジアミンの製造方法。
- 染色体中にリジン脱炭酸酵素をコードする遺伝子を有するコリネ型細菌による1,5-ペンタンジアミンの製造方法であって、該リジン脱炭酸酵素をコードする遺伝子が対数増殖期に機能するプロモーター下流に連結されていることを特徴とする、1,5-ペンタンジアミンの製造方法。
- 前記プロモーターがdivIVA遺伝子プロモーターであることを特徴とする、請求項2に記載の方法。
- 前記プロモーターが下記(A)~(D)のいずれかから選ばれるプロモーターであることを特徴とする、請求項2または3に記載の方法。
(A)配列番号2に記載の塩基配列からなるプロモーター
(B)配列番号2に記載の塩基配列において、1もしくは数個の塩基が置換、欠失、挿入および/または付加された塩基配列からなるプロモーター
(C)配列番号2に記載の塩基配列からなるプロモーターもしくはその相補鎖の全体またはその一部とストリンジェントな条件でハイブリダイズするプロモーター
(D)配列番号2に記載の塩基配列との配列同一性が少なくとも80%以上の塩基配列からなるプロモーター - 前記リジン脱炭酸酵素をコードする遺伝子が大腸菌由来の遺伝子であることを特徴とする、請求項1~4のいずれかに記載の方法。
- 前記リジン脱炭酸酵素をコードする遺伝子が下記(A)~(D)のいずれかから選ばれる遺伝子であってリジン脱炭酸酵素活性を有するタンパク質をコードするものであることを特徴とする、請求項1~5のいずれかに記載の方法。
(A)配列番号1に記載の塩基配列からなる遺伝子
(B)配列番号1に記載の塩基配列において、1もしくは数個の塩基が置換、欠失、挿入および/または付加された塩基配列からなる遺伝子
(C)配列番号1に記載の塩基配列からなる遺伝子もしくはその相補鎖の全体またはその一部とストリンジェントな条件でハイブリダイズする遺伝子
(D)配列番号1に記載の塩基配列との配列同一性が少なくとも80%以上の塩基配列からなる遺伝子。 - 前記コリネ型細菌が、L-リジン生産性の向上したコリネ型細菌であることを特徴とする、請求項1~7のいずれかに記載の方法。
- 前記コリネ型細菌が、配列番号3に記載のアミノ酸配列において311番目のアミノ酸残基がスレオニン以外のアミノ酸に置換された変異型アスパラギン酸キナーゼを有することを特徴とする、請求項1~8のいずれかに記載の方法。
- 前記コリネ型細菌のホモセリンデヒドロゲナーゼ活性が低下または欠損していることを特徴とする、請求項1~8のいずれかに記載の方法。
- 前記コリネ型細菌が、遺伝子挿入変異によってホモセリンデヒドロゲナーゼ活性を欠損していることを特徴とする、請求項9に記載の方法。
- 前記コリネ型細菌がコリネバクテリウム属(Genus Corynebacterium)に属する細菌であることを特徴とする、請求項1~10のいずれかに記載の方法。
- 前記コリネバクテリウム属(Genus Corynebacterium)に属する細菌がコリネバクテリウム・グルタミカム(Corynebacterium glutamicum)であることを特徴とする、請求項11に記載の方法。
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- 2011-04-11 JP JP2012510647A patent/JPWO2011129293A1/ja not_active Withdrawn
- 2011-04-11 EP EP11768814A patent/EP2559769A1/en not_active Withdrawn
- 2011-04-11 WO PCT/JP2011/058987 patent/WO2011129293A1/ja active Application Filing
- 2011-04-11 BR BR112012025490A patent/BR112012025490A2/pt not_active IP Right Cessation
- 2011-04-11 CA CA2796363A patent/CA2796363A1/en not_active Abandoned
- 2011-04-11 KR KR1020127022477A patent/KR20130041764A/ko not_active Application Discontinuation
- 2011-04-11 CN CN2011800187489A patent/CN102844440A/zh active Pending
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Cited By (3)
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CN105861586A (zh) * | 2016-05-16 | 2016-08-17 | 宁夏伊品生物科技股份有限公司 | 包括二氧化碳脱除工艺的发酵生产戊二胺的方法 |
CN105861586B (zh) * | 2016-05-16 | 2017-05-24 | 宁夏伊品生物科技股份有限公司 | 包括二氧化碳脱除工艺的发酵生产戊二胺的方法 |
US11060080B2 (en) | 2016-05-16 | 2021-07-13 | Heilongjiang Eppen New Materials Co., Ltd. | Method for fermentation-production of pentanediamine comprising carbon dioxide stripping technique |
Also Published As
Publication number | Publication date |
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KR20130041764A (ko) | 2013-04-25 |
US20130071888A1 (en) | 2013-03-21 |
BR112012025490A2 (pt) | 2015-10-06 |
JPWO2011129293A1 (ja) | 2013-07-18 |
CN102844440A (zh) | 2012-12-26 |
EP2559769A1 (en) | 2013-02-20 |
CA2796363A1 (en) | 2011-10-20 |
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