WO2006028063A1 - プロモーター機能を有するdna断片 - Google Patents
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- WO2006028063A1 WO2006028063A1 PCT/JP2005/016269 JP2005016269W WO2006028063A1 WO 2006028063 A1 WO2006028063 A1 WO 2006028063A1 JP 2005016269 W JP2005016269 W JP 2005016269W WO 2006028063 A1 WO2006028063 A1 WO 2006028063A1
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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
- C07K14/34—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Corynebacterium (G)
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/67—General methods for enhancing the expression
Definitions
- the present invention relates to a method for inducing expression of a promoter functioning in an aerobic coryneform bacterium, and a DNA sequence having the promoter function. More specifically, for the purpose of highly efficient production of useful substances such as various organic acids and ethanol, the function-induced expression enhancement and Z or suppression method of various gene promoters functioning in coryneform bacteria, and the promoter It relates to a functional DNA sequence.
- coryneform bacteria are industrially important aerobic Gram-positive bacteria that have been used to produce useful organic compounds such as various amino acids and lactic acid succinic acid.
- coryneform bacteria have a specific metabolic function that the metabolic pathway for producing substances is not impaired even under conditions in which cell division is suppressed by methods such as limiting oxygen supply.
- nutrient sources such as saccharides given to coryneform bacteria are efficiently diverted to the target product without being consumed for growth, and effective use of raw material nutrient sources is achieved.
- the ease of control of target substance production technology due to the suppression of division is the reason why coryneform bacteria are attracting industrial attention.
- a DNA fragment having a stronger promoter function than the tac promoter derived from E. coli is found on the chromosome of coryneform bacteria, and the DNA sequence is known.
- a method for controlling the expression of the promoter function there has been proposed a method of changing the carbon source composition such as saccharides and ethanol contained in the medium (see Patent Document 1).
- a promoter DNA sequence relating to a specific enzyme protein (aspartase) gene expressed in coryneform bacteria has been found (see Patent Document 2;).
- Patent Document 5 a recombinant DNA sequence containing a pfl (pyruvate formate lyase gene) promoter that is induced by pyruvate and repressed by oxygen
- yeast Saccharomyces Stress-responsive promoters such as cerebral saccharomayce s cerevisiae 2-deoxyglucose-6 phosphatase deoxidase gene oxidative stress (peracid-lipid addition), osmotic stress and glucose starvation stress (patented) Reference 6) is also known.
- Patent Document 6 also mentions methods for inducing various gene promoters other than those described above, such as a phosphoric acid deficiency induction method, a copper addition induction method, a chemical substance induction method, and a heat shock induction method.
- promoter DNA sequences and promoter functions such as those described above and methods for inducing expression by stress are known, but induction enhancement and Z or induction suppression are performed in the reaction medium under anaerobic conditions of the present invention.
- promoter function control method that functions in coryneform bacteria and a DNA fragment having a promoter function are known.
- Patent Document 1 JP-A-7-95891
- Patent Document 2 JP-A-7-31478
- Patent Document 3 International Publication No. 95Z23224 Pamphlet
- Patent Document 4 Japanese Patent Laid-Open No. 2001-61485
- Patent Document 5 Japanese Patent Laid-Open No. 3-80088
- Patent Document 6 Japanese Unexamined Patent Publication No. 2000-78977
- Aerobic coryneform bacteria (including recombinants) have been used for the production of useful organic compounds under aerobic conditions (various amino acids) and anaerobic conditions (lactic acid, succinic acid, ethanol, etc.). ing.
- the present invention relates to the production of useful organic compounds under anaerobic conditions, and various gene promoters in coryneform bacteria involved in the functioning of the coryneform bacteria under high efficiency to exhibit the functions of the coryneform bacteria under such conditions.
- the present invention provides a method for enhancing and / or suppressing the promoter function related to a gene.
- the present invention intends to provide DNA fragments having enhanced promoter functions and promoter functions that are suppressed or suppressed.
- the present inventors consider that various gene promoter function expression induction techniques in coryneform bacteria are important in order to exert the substance production function of coryneform bacteria under anaerobic conditions. As a result of intensive studies, the present invention has been achieved.
- Gene promoters are roughly classified into constitutive promoters and inducible promoters. When useful substances are produced under anaerobic conditions, promoters that are induced under anaerobic conditions rather than enhancing the functions of constitutive promoters.
- the discovery of functional expression control technology enables more efficient expression of the target gene, and thus becomes a highly efficient substance production technology.
- the degree of expression of various gene promoters can be known quantitatively, for example, by measuring the amount of mRNA produced using a DNA chip, and the amount produced under aerobic conditions is compared with the amount produced under anaerobic conditions.
- the present inventors have found that a DNA fragment having the promoter function of the present invention can be obtained. The inventors have further researched and completed the present invention.
- the present invention provides:
- DNA fragment having a promoter function that induces and enhances the expression of proteins involved in the production of useful substances in aerobic coryneform bacteria under anaerobic conditions DNA fragment having a promoter function that induces and enhances the expression of proteins involved in the production of useful substances in aerobic coryneform bacteria under anaerobic conditions
- DNA fragment according to (1) wherein the DNA fragment having a promoter function that induces and enhances the expression of a protein involved in the production of a useful substance is any of the following DNAs:
- DNA containing at least one base sequence selected from SEQ ID NOs: (1) to (394) in the sequence listing has a base sequence in which one or several bases are deleted, substituted, or added A promoter that functions to induce and enhance the expression of proteins involved in the production of useful substances;
- DNA fragment according to (1) wherein the DNA fragment having the ability is any one of the following DNAs;
- a DNA comprising at least one base sequence selected from SEQ ID Nos. (395) to (595) in the sequence listing, having a base sequence in which one or several bases are deleted, substituted, or added; And a promoter function that induces and suppresses the expression of proteins involved in the production of useful substances;
- the level of enhancement and Z or suppression of promoter function expression indicated by the expression level of mRNA is increased or Z or decreased by at least 50% or more than the level expressed in the reaction medium under aerobic conditions.
- Enzymes are divided into glycolytic pathway, reductive tricarboxylic acid pathway, anaprerotic pathway, amino acid synthesis pathway, purine synthesis pathway, pyrimidine synthesis pathway, cholesterol synthesis pathway, fatty acid synthesis pathway and pathways derived from these pathways.
- the organic acid is pyruvic acid, citrate, isocitrate, aconitic acid, 2-oxoglutaric acid, succinic acid, fumaric acid, malic acid, oxalate acetic acid, itaconic acid, lactic acid, acetic acid, darco Acid, 2-ketogluconic acid, 5-ketogluconic acid, D-araboascorbic acid, kojic acid, tetradecane-1,14-dicarboxylic acid, cumic acid and inosinic acid power At least one organic acid selected The DNA fragment according to (7) above,
- the amino acid is aspartic acid, threonine, glutamic acid, proline, glycine, alanine, cysteine, norine, isoleucine, leucine, tyrosine, phenylalanin, histidine, lysine, anoleginin, serine, asparagine, glutamine, hydroxy Lysine, cystine, methionine, tryptophan, ⁇ -alanin, ⁇ -aminobutyric acid (GABA), homosysteme, ornithine, 5-hydroxytryptophan, 3, 4-dihydroxyphenylalanine (dopa), triyoidothyronine
- the DNA fragment according to (7) above which is at least one amino acid selected from 4-hydroxyproline and thyroxine power,
- the DNA fragment having a promoter function of the present invention can efficiently and highly express target genes necessary for production of useful substances under anaerobic conditions, it can suppress the expression of unnecessary genes. It can be produced efficiently.
- by strengthening the functional expression of various protein gene promoters necessary for the production of target useful substances, or by suppressing the functional expression of unnecessary protein gene promoters specialized in the target product in coryneform bacteria (Aggregated) metabolic pathways can be created, and the flow of substances to unnecessary metabolic pathways can be suppressed. Specifically, the productivity of the target substance is improved and the production of unnecessary substances such as by-products can be suppressed.
- the DNA fragment having a promoter function according to the present invention is located in the coryneform bacterium so as to function upstream of a gene encoding a protein (for example, an enzyme) that produces a target useful substance whose expression should be enhanced or suppressed.
- a protein for example, an enzyme
- a transformant of coryneform bacterium that can efficiently produce a desired useful substance under anaerobic conditions can be created.
- the coryneform bacterium transformed using the DNA fragment having a promoter function of the present invention produces highly effective organic acids such as lactic acid succinic acid or alcohols and amino acids such as amino acid.
- the purified useful substance can be used as a raw material for polymer synthesis or as a pharmaceutical raw material, or in a wide range of fields such as cosmetics and food additives.
- FIG. 1 shows the correlation of fluorescence signal intensities of Cy3 and Cy5.
- promoter refers to a region on DNA to which RNA polymerase specifically binds in order to initiate transcription of a gene.
- a “DNA fragment having a promoter function” is a DNA fragment that can also obtain chromosomal DNA of an aerobic coryneform bacterium, or a DNA fragment that is artificially synthesized, and the DNA fragment is a function that initiates transcription of a gene. In other words, it means a DNA fragment presumed to have a gene transcription ability and contain the above promoter in the DNA fragment.
- induction is generally used when the expression is enhanced, but in the present invention, the increase or decrease of the expression is caused by factors inside and outside the cell.
- induction is used to mean triggered.
- the degree can also be indicated by the expression level of mRNA.
- induction enhancement in the present invention means that the expression of a DNA sequence having an induced promoter function is increased, that is, enhanced because the reaction medium is under a specific condition (anaerobic condition)
- the level of expression of the promoter function indicated by the expression level of mRNA means that the level is enhanced to at least about 50% or more, preferably about 100% or more than the expression level in the reaction medium under aerobic conditions.
- “Inhibition of induction” means that since the reaction medium is under specific conditions (anaerobic conditions), the expression of the DNA sequence containing the induced motor site is reduced, ie, suppressed.
- the level of expression of the promoter function expressed by the expression level of at least about 50% is reduced to at least about 50%, preferably about 90%, than the level expressed in the reaction medium under aerobic conditions. Say what you are.
- the coryneform bacterium used in the present invention is a Bursey's 'Mual' Determinant.
- Corynebacterium Brevibaterium, Arthrobacter, Mycobacteria, and Micrococcus.
- Corynebacterium Corynebataterum dartamicum
- Brevibacterium spp. include Brevibac terium lactofermentum ATCC13869, Breviba cterium flavum MJ-233 (FERM BP-1497) or MJ-233AB-41 (F ERM BP-1498) or Brevibacterium ammoniagenes ATCC6872 and the like.
- Arthrobacter examples include Arthrobacter globiformis ATCC8010, ATCC4336, ATCC21056, ATCC31250, ATC C31738, and ATCC35698.
- Micrococcus examples include Micrococcus freudenreichii No. 239 (FERM P— 13221), Micro coccus luteus No. 240 (FERM P— 13222), Micrococcus ureae. (Micr ococcus ureae) IAM1010 or Micrococcus roseus IF03764 etc. are mentioned.
- Corynebacterium glutamicur R (FERM P-18976), Corynebacterium glutamicum ATCC 13032 and the like are particularly preferable.
- the aerobic coryneform bacterium used in the present invention is a wild strain existing in nature.
- Artificial strains using biotechnology such as genetic recombination (for example, FERM P-17189, FERM P-17888, FERM P-18977, FERM P-18978, etc.) FERM P—18979 etc.)).
- a coryneform bacterium cell under aerobic conditions used in the following method is obtained by growing and culturing the above-mentioned coryneform bacterium under aerobic conditions.
- Cultivation of coryneform bacteria can be performed using a normal nutrient medium containing a carbon source, a nitrogen source, an inorganic salt, and the like.
- a carbon source for example, glucose or molasses as a carbon source
- a nitrogen source for example, ammonia, ammonium sulfate, ammonium salt, ammonium nitrate or urea, respectively. They can be used alone or in combination.
- the inorganic salt for example, potassium monohydrogen phosphate, potassium hydrogen phosphate-magnesium or magnesium sulfate can be used.
- nutrients such as peptone, meat extract, yeast extract, corn steep liquor, casamino acid, various vitamins such as piotin or thiamine, and the like can be appropriately added to the medium.
- Cultivation can be obtained by culturing while aerating air using a jar armor, and collecting and collecting cells under aerobic conditions with DO (dissolved oxygen concentration) of 6 ppm or more.
- the culture temperature can be about 20 ° C to 40 ° C, preferably about 25 ° C to 35 ° C.
- the pH during culture is about 5-10, preferably about 7-8, and pH adjustment during culture can be performed by adding acid or alkali.
- the carbon source concentration at the start of the culture is about 1 to 20% (W / V), preferably about 2 to 5% (W / V).
- Examples of a method for obtaining coryneform bacterial cells under anaerobic conditions include a method of washing and recovering bacterial cells cultured aerobically using the above-mentioned jar mentorer and the like.
- the method for recovering and separating the cultured cells from the culture obtained as described above is not particularly limited, and known methods such as centrifugation and membrane separation can be used.
- the cultured cells of the coryneform bacterium recovered and separated as described above can be obtained under reduced conditions (reaction solution), for example, as disclosed in JP 2004-194570 A. It is subjected to the reaction conditions for the formation of organic compounds with an acid reduction potential of about -200 millivolts to -500 millivolts, and is separated and recovered.
- the cells thus obtained can be used in the present invention as coryneform bacterial cells under anaerobic conditions.
- the method for obtaining a DNA fragment having a promoter function that enhances or suppresses induction under anaerobic conditions according to the present invention includes coryneform bacterial cells under aerobic conditions and coryneform bacterial cells under anaerobic conditions. The most efficient method is to extract mRNA from each of them and use a DNA chip for all genes to comprehensively analyze changes in the amount of individual mRNA in the cell.
- Examples of the DNA fragment having a promoter function that enhances induction under anaerobic conditions according to the present invention include the DNA fragments represented by SEQ ID NOs: (1) to (394) in the sequence listing.
- Examples of the DNA fragment having a promoter function include the DNA fragments shown in the above SEQ ID NOs: (395) to (595).
- Each DNA sequence shown in the above SEQ ID No. has a base sequence with one or several bases deleted, substituted, or added, and induces and enhances the expression of proteins involved in the production of useful substances Alternatively, DNA having a promoter function that suppresses induction is included.
- DNA having a promoter function that suppresses induction is included.
- the nucleotide sequence when “one or several bases are deleted, substituted, or added”, the number is determined by a well-known technical method such as site-directed mutagenesis, or the number that can occur naturally ( 1 to several bases) is deleted, substituted, or added.
- the DNA fragment having a promoter function under anaerobic conditions includes a DNA fragment represented by the above-mentioned SEQ ID NO. And a DNA comprising a complementary base sequence under stringent conditions.
- DNA that can be hybridized under stringent conditions means that the above-mentioned DNA is used as a probe, and the hybrid-method, plaque-hybridization method, or Southern blot hybrid method is used. It means DNA obtained by using the session method.
- the stringent conditions include, for example, an SSC solution with a salt concentration of about 0.1 to 2 times (the composition of the SSC solution with a concentration of 1 consists of 150 mM sodium chloride and 15 mM sodium quenate), temperature. Hybridization conditions at about 65 ° C.
- the DNA fragment having a promoter function under anaerobic conditions according to the present invention has at least about 80% homology with each of the DNA sequences shown in SEQ ID NOs. And DNA having a promoter function that induces, enhances or suppresses the expression of proteins involved in the production of useful substances.
- the homologous DNA is preferably a DNA having a homology of about 80% or more, more preferably a DNA having a homology of about 90% or more, more preferably about 95%, under non-stringent conditions. This DNA has the above homology.
- the high stringent conditions include, for example, a sodium concentration of about 19 to 40 mM, preferably about 19 to 20 mM, and a temperature of about 50 to 70 ° C, preferably about 60 to 65 ° C.
- a sodium concentration of about 19 to 40 mM preferably about 19 to 20 mM
- a temperature of about 50 to 70 ° C preferably about 60 to 65 ° C.
- the most preferable condition is when the sodium concentration is about 19 mM and the temperature is about 65 ° C.
- the degree of enhancement or suppression of the promoter function in a DNA fragment having a promoter function under anaerobic conditions can be determined using the expression level of mRNA as an index.
- “enhanced expression” refers to the ability to express mRNA in a reaction medium under anaerobic conditions in coryneform bacteria, at least about 50% more than the expression level of mRNA in a reaction medium under aerobic conditions, In other words, it means about 1.5 times or more increase.
- “suppression of expression” means that the expression level of mRNA in the reaction medium under anaerobic conditions of coryneform bacteria is reduced by at least about 50% or more than the expression level of mRNA in the reaction medium under aerobic conditions. That is, it is reduced to about 1 Z2 or less.
- the method for obtaining a DNA fragment having a promoter function that enhances or suppresses induction under non-aerobic conditions includes coryneform bacterial cells under aerobic conditions and coryneform under non-aerobic conditions.
- the most efficient method is to extract mRNA from each bacterial cell and comprehensively analyze changes in the amount of individual mRNA in the cell using a DNA chip for all genes.
- the above DNA chip is, for example, whole genome analysis of coryneform bacteria (C. glutamicum R strain)
- the method for extracting total RNA of coryneform bacterial cell force is performed, for example, by lysozyme treatment of the cell suspension, shaking with glass beads, for example, QIAGEN RNeasy Mini Kit (manufactured by Qiagen).
- RNA extraction kit eg MORA- eXTRACT (Cosmo 'Bio Inc.), Total RNA Isolation Mini kit (manufactured by Agilent Co.), RNA isolation Kit (Stratagene), Isogen (-Tubongene), Trizol (Invitrogen), QuickPick mRNA-mini kit (BIO NOBILE) and the like can be preferably used.
- the labeling of the probe used for the DNA chip is performed by synthesizing cDNA using random primers and labeling with a marker (eg, fluorescent label or radioisotope) using the total RNA as a standard method. Can be created.
- a marker eg, fluorescent label or radioisotope
- the total RNA total RNA (Cy5) extracted from coryneform bacterial cell force under aerobic conditions or RNA (Cy3) extracted from coryneform bacterial cell forces under anaerobic conditions is used.
- Hybridization, washing, and drying of the DNA chip are preferably performed automatically by, for example, Amersham Biosciences Lucidea SlidePro in order to suppress variation in data as much as possible.
- the detected image data is preferably subjected to numerical value and normal value by Axon Instruments GenePix Pro 5.0 or the like. It is preferable to use an average value of at least three experimental data.
- the obtained data (Ratio of Meands (Cy3ZCy5); signal intensity under non-aerobic condition Z signal intensity under aerobic condition) is about 1.5 times (about 50% increase) or more or about 0.5 times (about 50 times)
- Genomic intelligence is also extracted for the genes corresponding to the following samples, from the lbp upstream of the start codon of each gene to the end of the upstream gene of that gene (in the case of co-directional transcription; lbp downstream of the start codon of the upstream gene)
- Up to the reverse transcription gene up to lbp upstream of the start codon of the upstream gene) can be selected as the inducible promoter.
- the protein involved in the production of useful substances is preferably an enzyme involved in metabolism in coryneform bacteria.
- examples of such enzymes include glycolysis pathway, reductive tricarboxylic acid pathway. , Anaprerotic pathway, amino acid synthesis pathway, purine synthesis pathway, pyrimidine synthesis pathway, cholesterol synthesis pathway or fatty acid synthesis pathway, are enzymes involved in pathways derived from these pathways, glycolysis pathway, reduction More preferred are enzymes involved in the chemical tricarboxylic acid pathway, the anaprerotic pathway or the amino acid synthesis pathway.
- Enzymes involved in the glycolytic pathway include, for example, hexokinase, dalcokinase, phosphoglucose isomerase, phosphofructose kinase, aldolase, triosephosphate isomerase, glyceraldehyde 3-phosphate dehydrogenase, phosphoglycerate kinase, phosphodarine Powers including, but not limited to, cellomase, enolase or pyruvate kinase.
- Examples of the enzymes involved in the reductive tricarboxylic acid pathway include pyruvate synthase, citrate synthase, aconite hydratase, isocitrate dehydrogenase, 2-oxoglutarate dehydrogenase, succil CoA synthase, succinate dehydrogenase, Forces such as fumarate hydratase, malate dehydrogenase, isocitrate lyase or malate synthase are not limited to these.
- Enzymes involved in the anaprerotic pathway include, but are not limited to, for example, pyruvate carboxylase, phosphoenolpyruvate carboxylase, or phosphoenolpyruvate carboxykinase.
- Enzymes involved in the amino acid synthesis pathway include all enzymes that generate amino acids including amino acid synthase, amino acid synthetase, and the like. Specifically, for example, aspartate aminotransferase, asparaginase, glutamate-alanine aminotransferase, phosphoglycerate dehydrokinase, phosphoserine aminotransferase, phosphoserine phosphatase, serine dehydratase, glycine hydroxymethyltransferase, glycine synthase, threo -Aldolase, threonine dehydratase, threonine synthase, homoserine kinase, homoserine dehydrogenase, aspartate semialdehyde dehydrogenase, cystine reductase, histidinol dehydrogenase, phenylalanine hydroxylase, glutamine synthetas
- Examples of enzymes involved in the purine synthesis pathway include enzymes involved in the pentose phosphate cycle (eg, gnolecose 6-phosphate dehydrogenase, lactonase, 6-phosphognoleconate dehydrogenase, ribulose acid 3-epimerase, ribose phosphate isomerase, etc.) ), Ribose phosphate pyrophosphokinase, amide phosphoribosyltransferase, glycine amide ribotide synthase, glycine amide ribotide formyltransferase, formylstructure amide ribotide synthetase, AIR (5-aminoimidazole ribotide) synthetase, 5-aminoimidazole -4 (N-succinocarboxamide) ribotide synthetase, ade-losuccinate lya
- Examples of the enzyme involved in the pyrimidine synthesis pathway include force ruvamoyl phosphate synthase II, aspartate force rubamoyl transferase, dihydrorotase, orotate reductase, dihydrorotate dehydrogenase, phosphorate phosphoroyltransferase.
- Examples thereof include OMP (orotidine monophosphate) decarboxylase, cytidine deaminase, uridine phosphorylase, deoxyuridine phosphorylase, dihydrouracil dehydrogenase, dihydropyrimidinase and thymidine phosphorylase.
- Examples of enzymes involved in the cholesterol synthesis pathway include 3-hydroxy-3-methylglutaryl CoA reductase, lanosterol synthase, and the like.
- Examples of the enzymes involved in the fatty acid synthesis pathway include fatty acid synthase, long-chain fatty acid acylated coenzyme A, acetyl CoA carboxylase, and acyltransferase.
- Examples of enzymes involved in pathways derived from the above pathways include lactate dehydrogenase that produces pyruvate lactic acid, pyruvate decarboxylase or alcohol dehydrogenase that produces alcohol from pyruvate, and pyrubin that produces acetate from pyruvate. Examples thereof include, but are not limited to, malic acid synthase or isocitrate lyase in the darioxyl cycle.
- the DNA fragment having a promoter function of the present invention is involved in the production of the useful substance. It should be introduced on a plasmid or chromosome that can replicate autonomously in coryneform bacteria so that it is located upstream of the gene encoding the protein. Thus, by placing a DNA fragment having a promoter function upstream of a gene encoding a protein involved in the production of a useful substance, the target useful substance can be produced efficiently and highly efficiently under anaerobic conditions.
- an expression gene for example, a gene encoding a useful protein produced in plants, which is not possessed by a coryneform bacterium, is arranged. You can also
- Examples of useful substances include organic acids, amino acids, alcohols, steroids, nucleic acids, fatty acids, and physiologically active substances.
- organic acids examples include pyruvic acid, citrate, isocitrate, aconitic acid, 2-oxoglutaric acid, succinic acid, fumaric acid, malic acid, oxalate acetic acid, itaconic acid, lactic acid, acetic acid, darconic acid, 2 Examples include ketogluconic acid, 5 ketogluconic acid, D-araboascorbic acid, kojic acid, tetradecane 1,14-dicarboxylic acid, or cumic acid.
- Organic acids also include, but are not limited to, purine nucleotides such as inosinic acid.
- amino acids aspartic acid, threonine, glutamic acid, proline, glycine, alanine, cysteine, norine, isoleucine, leucine, tyrosine, phenylalanin, histidine, lysine, anoleginin, serine, wasparagine, glutamine, hydroxy
- amino acids aspartic acid, threonine, glutamic acid, proline, glycine, alanine, cysteine, norine, isoleucine, leucine, tyrosine, phenylalanin, histidine, lysine, anoleginin, serine, wasparagine, glutamine, hydroxy
- Examples include lysine, cystine, methionine or tributophan.
- ⁇ -alanine for example, ⁇ -alanine, ⁇ -alanine (GABA), homocystine, orthine, 5-hydroxytryptophan, 3,4-dihydroxyphenylalanine (dopa), triodothyronine, 4- Special amino acids such as hydroxyproline or thyroxine are not limited to these.
- any alcohol that is produced by alcohol fermentation is preferable.
- methanol, ethanol, butanol and the like are not limited thereto.
- a steroid having a perhydrocyclopentanophenanthrene skeleton as a basic structure.
- cholesterol eg, taurocholic acid, glycocholic acid, etc.
- sex hormone eg, lutein hormone, male steroid, follicular steroid, etc.
- adrenal cortex hormone eg, cortisol, corticosterone, aldosterone
- plant saponins such as digitoxin are also included, but not limited thereto.
- nucleic acid examples include RNA and DNA.
- fatty acids examples include normitic acid, myristic acid, stearic acid, and the like. Fatty acids also include, but are not limited to, for example, sphingoids, prostaglandins, arachidonic acids or eicosatetraenoic acids.
- physiologically active substances include hormones (eg, insulin, growth hormone, ACTH, oxytocin, vasopressin, thyroxine, TRH, LHRH, etc.), vitamins (eg, vitamin B, vitamin B, vitamin B, nontetonic acid). , Folic acid, vivid chin, vitamin K etc.), histamine,
- Powers including serotonin or interleukins, but not limited to these.
- the useful substance of the present invention is not limited to those described above, and any substance that can be produced by the coryneform bacterium of the present invention can be preferably used.
- reaction stock solution having 0 g of distilled water and lOOOmL force was prepared and autoclaved at 120 ° C for 20 minutes. 500 mL of this reaction stock solution was introduced into a 1 L glass reaction vessel.
- This reaction vessel is equipped with a pH adjusting device, a temperature maintaining device, an in-vessel reaction liquid stirring device, and a reduction potential measuring device.
- the coryneform bacteria prepared after the culturing were suspended in 500 mL of the reaction stock solution in the reaction vessel. Glucose 200 mM was added and the reaction temperature was maintained at 33 ° C., and an organic compound production reaction was started. The oxidation-reduction potential during the reaction was initially 200 mV, but decreased immediately after the start of the reaction, and was maintained at ⁇ 400 mV to continue the reaction. After 4 hours of reaction, the cells were collected and used as coryneform bacterial cells under anaerobic conditions. When the reaction medium solution at this time was analyzed using a liquid chromatography, 186 mM (16.7 g / L) of lactic acid (this value after 3 hours) was produced.
- Degradation of contaminating genomic DNA was performed on the column using Set.
- 350 L of Buffer RW1 was applied to the column, allowed to stand at room temperature for 5 minutes, centrifuged at 10, OOOrpm for 15 seconds, and the effluent was discarded.
- 500 L Buffer RPE was added to the column and centrifuged at 10, OOOrpm for 15 seconds, and the effluent was discarded.
- 500 L Buffer RPE was added to the column and centrifuged at 10, OOOrpm for 2 minutes, and the effluent was discarded.
- RNA concentration was calculated by measuring the O. D. absorbance with a spectrophotometer (
- the DNA chip adopts the Stanford method.
- Whole genome solution of C. glutamicum R strain Analysis (Hiroshi Nonaka, Kaori Nakata, Naoko Okai, Mariko Wada, Yumiko Sato, Kos Peter, Masayuki Inui, Hideaki Yukawa, Japan Society for Agricultural Chemistry, April 2003, Yokohama, Japan Agricultural Chemistry Society Estimate the presence of 3080 genes from the 2003 Annual Meeting Abstracts (see p20).
- PCR is a pair consisting of a 20 base sequence downstream from the third base (ATG) of the start codon of each gene and a 20 base sequence upstream of the first base (TAA) force of the stop codon.
- Primers were designed for all genes, and DNA fragments containing each gene ORF sequence were amplified by PCR.
- the amplified product was confirmed to show the desired size in a single band by electrophoresis on a 1% agarose gel. When multiple bands were confirmed, repeated experiments were performed to obtain a single band by optimizing the PCR conditions such as annealing temperature.
- the finally obtained DNA sample was spotted on an IX 3 inch Takara Slide by a spotter, and then fixed by the Takara array slide standard method. To obtain quantitative properties, two spots were performed for each gene.
- the DNA chip uses the total RNA of the Corynebacterium glutamicum R strain as a cocoon type, cDNA synthesis with a random primer (9mer) and fluorescent labeling (Cy5 is the total RNA extracted from coryneform bacterial cells under aerobic conditions. 3 was performed using RNA extracted from coryneform bacterial cells under anaerobic conditions) to prepare a labeled probe. Amersham Biosciences CyScribe cDNA Post Labeling Kit (Amersham Biosciences Corp. USA) was used for cDNA synthesis and labeling reaction, and the protocol was followed. 8 ⁇ L of total RNA (30 ⁇ g) was supplemented with 3 ⁇ L of random nonamer primers, heated at 70 ° C. for 5 minutes, and allowed to stand at room temperature for 10 minutes to anneal the primers to RNA. This RNA was added to the reaction reagent (5x CyScript buffer, 0.1M DTT, 2 ⁇ L, Cy5 is the total RNA extracted from coryneform bacterial
- Digitization and normalization were performed using GenePix Pro 5.0 (Axon Instruments, Inc., CA, USA). After adjusting the color tone (Cy5; green, Cy3; red) for each channel and synthesizing images, the spots were surrounded by a grid and digitized. For normalization, global normalization was adopted. Assuming that the total expression intensity of all genes is the same among the cells being compared, the fluorescence intensity ratio of the entire array is set so that the median of the fluorescence intensity ratio of all signals of Cy5 and Cy3 (Median) is equal. Fixed (normalized).
- Genome information is extracted from this Ratio of Meands (Cy3ZCy5) corresponding to a sample whose expression ratio is 1.5 times (50% rise) or more or 0.5 times (50% rise) or less, and each gene starts. From lbp upstream of the codon to the end of the upstream gene of the gene (in the case of co-directional transcription; lbp downstream of the termination codon of the upstream gene; reverse transcription gene; lbp upstream of the start codon of the upstream gene) This sequence was selected as an inducible promoter. As a result, the ratio of Meands (Cy3ZCy5) with an expression ratio of 1.5 times (50% increase) is 394 species (Table 1), and 0.5 or less (50% decrease) is 201 species (Table 1). 2) existed.
- the expression ratio was analyzed by real-time quantitative RT-PCR.
- the target samples were randomly selected from 3 types of SEQ ID NOs: 3, 22, 47 (numbers in Table 1), 0. Less than 5 times induction suppression Promoter 201 kinds of medium strengths Randomly selected 3 kinds of SEQ ID NO: 410, 474, 502 (numbers in Table 2).
- Real-time quantitative RT-PCR analysis was performed with QIAGEN QuantiTect SYBR Green RT-PCR Kit (Qiagen) using total RNA as a saddle. Gene-specific primers were designed using Applied Biosystems Primer Express Software v2.0 (Applied Biosystems, USA). Real-time PCR experiments were performed with ABI PRIS M 7000 Sequence Detection System (Applied Biosystems, USA), and PCR was performed using 96- Well Optical Reaction Plate (Applied Biosystems) and Optical Adhesive Covers (Applied Biosystems).
- PCR reaction mixture is sample); Total RNA, 60 ng, 2 x QuantiTect S YBR Green RT—PCR Master Mix, 25 ⁇ L ⁇ , Primer Forward, 0.5 ⁇ M, Primer Reverse, 0.5 ⁇ M, QuantiTect RT Mix, adjusted with 0.5 ⁇ L.
- the PCR reaction was performed at 50 ° C 30 min, 95 ° C 15 min, (95 ° C 15 sec, 57 ° C 20 sec, 60 ° C 1 min) x 40 cycles. After the PCR reaction is completed, the expression level is calculated by quantifying the ratio of expression levels for each sample and comparing the samples with each other using the expression ratio.
- the induction-enhanced promoter SEQ ID NO: 3, 22, 47 (number in Table 1) showing the expression ratio of 1.5 times or more (the result is Table 3), the induction repressing promoter SEQ ID NO: 410 less than 0.5 times,
- the expression ratios of 474 and 502 (numbers in Table 2) (results are in Table 4) matched the DNA chip analysis results very well.
- the DNA fragment of the present invention is useful as a primer to be introduced into a transformed coryneform bacterium that highly efficiently produces a useful substance such as lactic acid succinic acid.
- the coryneform bacterium into which the DNA fragment of the present invention has been introduced can be used for the production of organic acids, alcohols or amino acids.
- the produced organic acid can be used in a wide range of fields such as a polymer synthesis raw material or a pharmaceutical raw material, a cosmetic use or a food additive use.
- succinic acid and its derivatives are useful for biodegradable plastic raw materials and clean cleaning solvent applications that do not cause environmental pollution.
Abstract
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EP05776785A EP1790721A4 (en) | 2004-09-09 | 2005-09-05 | DNA FRAGMENT HAVING A PROMOTING FUNCTION |
US11/662,358 US8604180B2 (en) | 2004-09-09 | 2005-09-05 | DNA fragment having promoter function |
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JPWO2006028063A1 (ja) | 2008-05-08 |
ES2444785T3 (es) | 2014-02-26 |
EP2434015B1 (en) | 2013-11-20 |
JP4712716B2 (ja) | 2011-06-29 |
US20080171371A1 (en) | 2008-07-17 |
EP2434015A1 (en) | 2012-03-28 |
EP1790721A4 (en) | 2008-12-10 |
US8604180B2 (en) | 2013-12-10 |
EP1790721A1 (en) | 2007-05-30 |
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