78 results about "Pyruvate synthesis" patented technology

In vivo method of producing esters from acetyle coA, such as isoamyl acetate and succinate, has been developed by producing null mutants in pathways that use acetyl coA and by overexpressing products that use NADH and in order to maintain the proper redox balance between NADH and NAD+. The method is exemplified with null mutations in ldhA, adhE, ackA-pta and overexpression of pyruvate carboxylase and alcohol acetyltransferase. This strain produces higher levels of both isoamyl acetate and succinate.

The present invention relates to a method for producing optically active IHOG, which can in turn be used for the production of monatin. The present invention further relates to a method for producing optically active monatin, and aldolase used for these methods. As such, the present invention enables the synthesis of 4-(Indole-3-ylmethyl)-4-hydroxy-2-oxoglutaric acid with high optical purity, which is useful as an intermediate in the synthesis of optically active monatin, from indole pyruvic acid and pyruvic acid (or oxaloacetic acid).

The invention discloses a corynebacterium glutamicum for producing high-yield succinic acid by utilizing straw hydrolysate, and a construction and applications. The method comprises the following steps: (1) knocking out side products acetic acid and lactic acid formation pathway related genes from corynebacterium glutamicum ATCC 13032, and introducing anaplerotic pathway phosphoenolpyruvate carboxylase and pyruvate carboxylase and phosphopentose pathway transketoaldehydase and transketolase on a strong promoter overexpression chromosome; and introducing xylose transport gene on the chromosome; and (2) expressing pyruvate carboxylase, succinic acid export protein and citrate synthase as well as xylose isomerase and xylulokinase on the corynebacterium glutamicum obtained in the step (1). 98.6gL<-1> of succinic acid can be anaerobically produced after 22.5h by utilizing mixed glucose and xylose in straw hydrolysate, with the yield of 0.98g succinic acid/g total sugar. The final concentration, yield and productivity of succinic acid achieve higher level, and the corynebacterium glutamicum has good industrial potential.

The invention discloses construction and applications of a corynebacterium glutamicum mutant strain for producing L-homoserine, and belongs to the technical field of fermentation engineering. Corynebacterium glutamicum ATCC 13032 is taken as a starting strain to knock out regulatory protein McbR, homoserine kinase, transport protein MetD, phosphoenolpyruvate carboxykinase; the expression of isocitrate dehydrogenase is down regulated; transport protein BrnFE, aspartic semialdehyde dehydrogenase and homoserine dehydrogenase are overexpressed; and the expression of aspartate kinase, pyruvate carboxylase and the aspartate kinase I derived from escherichia coli are enhanced. Shake flask culture can be performed on the mutant strain for 48 h, and the yield of L-homoserine can reach 8.8 g/L.

The invention discloses a genetically engineered bacterium for directly producing L-aspartic acid through fermentation. The classification naming of the genetically engineered bacterium is Escherichia coli CM-AS-115, and the preservation number of the genetically engineered bacterium is CCTCC NO: M 2016457. The bacterial strain relates to inactivation of multiple genes, evolution, metabolism and domestication are simultaneously carried out on the bacterial strain which knockouts the multiple genes, and a mutant strain, namely, CM-AS-105, which has a lower respiratory quotient under the aerobic condition and of which the highest dry cell weight is 60-70% of dry weight of an original strain W1485 is obtained; meanwhile, the bacterial strain further relates to over expressions of two genes, wherein the two genes comprise an enol phosphate type pyruvate carboxylase encoding gene (ppc) and an aspartase encoding gene (aspA), and the obtained bacterial strain is CM-AS-115. The genetically engineered bacterium for directly producing L-aspartic acid through fermentation achieves a way of completely adopting renewable biomass resources such as starch and cellulose as raw materials to ferment and prepare the L-aspartic acid, and the way is green and environmentally friendly.

The invention discloses a corynebacterium glutamicum engineering bacterium for anaerobic conversion to produce succinic acid, and a building method and application thereof, and belongs to the field of genetic engineering. A pyruvate carboxylase gene of the corynebacterium glutamicum and phosphoenolpyruvate carboxylase from escherichia coli are cloned to corynebacterium glutamicum (ATCC13032); a lactate dehydrogenase gene of the corynebacterium glutamicum is knocked out in a homologous recombination manner. By adopting the lactic dehydrogenase-defective corynebacterium glutamicum for coexpression of a carboxylase gene, anaerobic production of succinic acid is carried out in a cell reutilization manner, so that the yield of succinic acid can be greatly improved; the yield can be up to 75g/L; the conversion rate of saccharic acid is 75%; the corynebacterium glutamicum engineering bacterium has a good application prospect; a fermentation model, especially a fermentation model for cell reutilization is built according to the optimum condition for biological transformation of succinic acid; the acid-production performance in repeated batch transformation process of cells can be basically kept stable.

The present disclosure is related to genetically engineered microbial strains and related bioprocesses for the production of pyruvate and related products. Specifically, the use of dynamically controlled synthetic metabolic valves to reduce the activity of enzymes known to contribute to pyruvate synthesis, leads to increased pyruvate production in a two-stage process rather than a decrease in production.

The invention discloses a method for improving the yield of fumaric acid and belongs to the fields of genetic engineering and fermentation engineering. The method comprises the following steps: performing codon optimization on a pyruvate carboxylase gene RoPYC of rhizopus oryzae to obtain a gene RoPYC* and then mutating a R485 site of the gene RoPYC* into proline. In comparison with the yield after the expression of a wild type pyruvate carboxylase before codon optimization, the yield is improved by 24.6 percent; 10 percent of carbon dioxide is additionally introduced when genetically-engineered bacteria of an expression mutant is fermented for 36 hours in a fermentation tank of 7L, so that the yield of the fumaric acid reaches 453.6 mg/Lm and is improved by 20 percent through comparison. According to the method disclosed by the invention, a synthetic route through which a carbon metabolic flow enters the fumaric acid from pyruvic acid is effectively enhanced, so that conditions are created for the construction of engineering yeasts to efficiently produce the fumaric acid and other dicarboxylic acid, therefore, the industrial application value and the prospect are good.

A system for carbon fixation is provided. The system comprises enzymes which catalyze reactions of a carbon fixation pathway, wherein at least one of the reactions of the carbon fixation pathway is a carboxylation reaction, wherein products of the reactions of the carbon fixation pathway comprise oxaloacetate and malonyl-CoA, wherein an enzyme which performs the carboxylation reaction is selected from the group consisting of phophoenolpyruvate (PEP) carboxlase, pyruvate carboxylase and acetyl-CoA carboxylase and wherein an export product of the carbon fixation pathway is glyoxylate. Additional carbon fixation pathways are also provided and methods of generating same.

The invention relates to a method for strengthening capability of synthesizing L-leucine from pyruvic acid in corynebacterium glutamicum, and belongs to the field of genetic engineering. According tothe invention, a gene engineering method is applied, and in order to regulate and control an L-leucine anabolic flux, sequence sites of an ilvBNC operon and an leuA gene promoter are replaced by a Ptuf promoter; and meanwhile, the key enzyme gene isopropyl malate synthetase IPMS is overexpressed to further strengthen the anabolic flux of synthesizing leucine from pyruvic acid. An efficient L-leucine synthesis pathway is constructed, and the synthesis flux of L-valine in L-leucine producing bacteria of corynebacterium glutamicum is weakened. A recombinant strain WL-14 produces 28.47+/-0.36 g/Lof leucine, which is 56.8% higher than leucine yield of an original strain WL-8; and the valine accumulation amount in the strain WL-14 is reduced to 1.78+/-0.21 g/L.

The invention relates to a temperature switch system and an application thereof to increment of yield of amino acids, in particular to a method for adjusting and controlling intracellular metabolism flow distribution to increment yield of threonine by using the temperature switch system, and belongs to the technical field of genetic engineering and microbial fermentation. The temperature switch system is used, so that the entire fermentation course is divided into two stages of cell growth and fermentation and production to be adaptive to intracellular environmental changes of different stagesin a fermentation process of an engineering bacterial strain. According to the system, the heterologous expression of pyruvate carboxylase is controlled, and through combination of a chemical property that oxaloacetic acid is thermo-sensitive and easy for decarboxylation, metabolism flows are rebalanced between pyruvate and oxaloacetic acid, a central metabolic pathway is dynamically regulated, and supply of reduced cofactors is guaranteed to promote production of L-threonine. The threonine mol conversion rate of obtained temperature control threonine production bacterial strains namely TWF106/ pFT24rp is 111.78% and the threonine mol conversion rate of obtained temperature control threonine production bacterial strains namely TW113/pFT24rpal is 124.03%.

The present invention relates to the measuring method of the content of glycine, the composition and the component of the reagent using enzyme cycle amplification method, enzyme colorimetric method and enzyme-linked method technology, the technical principle of its measuring is based on hydrogen cyanide synthase, pyruvate synthase, The series of catalyzed reactions of the malonate semialdehyde dehydrogenase is completed, and the invention also relates to a glycine determination kit. The determination method of the invention has high sensitivity and small error, so the determination method and the kit of the invention can be widely used in food inspection.

The invention relates to a method for measuring ammonia (ammonia ion) content through an enzymatic colorimetric method and an enzyme coupling reaction technique, and the composition and the constituents of a reagent. The measuring technical principle of the method is fulfilled through the serial catalytic reactions of ammonia kinase, pyruvate carboxylase, and lactate dehydrogenase. The invention further relates to an ammonia (ammonia ion) diagnosing/measuring kit. The method provided by the invention has the advantages of high sensitivity and small error, so that the method and the kit provided by the invention can be widely applied to clinical medicine/food inspections.

The invention relates to a recombinant strain of Bacillus subtilis, wherein pyruvate carboxylase BalpycA, glyceraldehyde-3-phosphate ferredoxin dehydrogenase gor, isocitrate NAD⁺ dehydrogenase icd, malate quinone dehydrogenase mqo, pyruvate ferredoxin oxidoreductase porAB and nitrogenase ferritin cyh are integrated and expressed in the recombinant strain. The invention also discloses use of the recombinant strain in fermentation production of acetylglucosamine. The recombinant Bacillus subtilis of the invention eliminates the central carbon metabolism overflow of the Bacillus subtilis and balances the intracellular reducing force, and the fermentation yield of acetylglucosamine is greatly improved.

The invention relates to a genetically engineered bacterium for producing D-pantothenic acid at high yield, a construction method and application of the genetically engineered bacterium to preparation of the D-pantothenic acid through microbial fermentation. According to the genetically engineered bacterium, related genes of an organic acid synthesis path of escherichia coli are blocked, so that side effects of organic acid are reduced and the accumulation of a pyruvic acid pool is increased; a pyruvic acid synthesis path gene pykA is enhanced and the accumulation of pyruvic acid is enhanced; negative feedback inhibition of a key enzyme is relieved and a bottleneck step of synthesizing the D-pantothenic acid is solved; the sugar uptake capability is improved and the accumulation of a precursor pyruvic acid is increased; over-expression genes lpd and ilvD are used for improving an expression condition of a main path synthesis path gene; finally, the engineered bacterium for producing the D-pantothenic acid at higher yield is obtained; an exogenous enzyme does not need to be introduced into a plasmid to enhance the enzyme activity of the key enzyme and the shake-flask fermentation yield reaches 3.99g/L; a repressor protein coding gene lacI is knocked out to form constitutive expression; after a culture medium is optimized, the shake-flask fermentation yield reaches 4.72g/L; materials are supplemented in batches in a 5L fermentation tank and fermentation is carried out; and the yield reaches 34.28g/L.

The invention discloses a mutant of a corynebacterium glutamicum pyruvate carboxylase gene promoter and application of the mutant. The mutant has improved promoter activity in comparison with that of a wild type promoter. Therefore, the mutant can be used for enhancing the expression of a target gene, for example, the mutant is operably connected with a pyruvate carboxylase gene, so that the expression intensity of pyruvate carboxylase is enhanced, and the amino acid production efficiency of the strain is improved.

The invention relates to the nucleic acid molecule and method for improving C3 plant photosynthesis by utilizing transgenic technology, wherein the nucleic acid molecule is the nucleic acid molecule which encodes sugar cane phosphoenolpyruvate pyruvate carboxylase (PEPC), and the method consists of leading the enzyme-sugar cane phosphoenolpyruvate pyruvate carboxylase (PEPC) participating C4 photosynthesis channels into plants having C3 type photosynthesis channels such as rice, so as to provided them with C4 photosynthesis channels, and make them have higher efficiency of photosynthetic activity. The invention also relates to the expression vectors for converting the C3 plants, and the use of the method.