30 results about "Corynebacterium pekinense" patented technology

The invention discloses a synergistic agent and a preparation method thereof, wherein the synergistic agent comprises the following raw materials according to proportion by weight: 70.8-87.5 parts of stone potassium, 3-8 parts of polyaspartic acid, 3-8 parts of maleic anhydride, 0.3-0.5 parts of azone, 5-10 parts of urea or ammonium hydrogen carbonate, 0.4-0.7 parts of d bacteria liquid, 0.3-0.8 parts of EDTA (Ethylene Diamine Tetraacetic Acid) and 0.2-0.5 parts of n-butyl alcohol. The preparation method of the stone potassium comprises the following steps: respectively crashing 50 parts of zeolite ore, 20 parts of phosphorite and 30 parts of leopoldite into 100-200 meshes and then uniformly mixing so as to obtain a mixture; taking 73.5-87.3 parts of mixture, 2-4 parts of urea, 2-5 parts of phosphorus pentoxide, 1-2 parts of potassium sulfate, 0.2-0.5 parts of ammonium molybdate or sodium molybdate, 1-2 parts of manganous sulfate, 3-6 parts of ferrous sulfate, 1-2 parts of zinc sulfate, 1-2 parts of sodium borate, 0.5-1 parts of copper sulfate and 1-2 parts of fulvic acid; and stirring and sealing up for keeping standby. The preparation method of the bacteria liquid comprises the following steps: uniformly mixing colon bacillus, Fusarium moniliforme, Corynebacterium pekinense, Streptomyces jingyangensis, Bacillus megatherium, Bacillus mucilaginosus and Streptomyces according to a proportion of 0.5%: 0.5%: 0.5%: 0.5%: 0.5%: 0.5%: 0.5%. The synergistic agent is multipurpose, nutritious, low in cost, non-toxic, nuisanceless and free of residue.

The present invention relates to a protein having an activity of giving a lysozyme insensitivity to a lysozyme-sensitive microorganism belonging to Corynebacterium glutamicum; DNA which codes for the protein; a recombinant vector containing the DNA; a transformant obtained by introducing the recombinant vector into a host cell; a bacterium having a lysozyme sensitivity in which the activity of the protein is inactivated; and a method for producing an amino acid using the bacterium.

The invention relates to the field of microorganisms and discloses Corynebacterium pekinense. The collection number of the Corynebacterium pekinense is CGMCC No. 5923. The Corynebacterium pekinense MHZ-0111 of which the collection number is CGMCC No. 5923 is obtained by performing ultraviolet radiation on wild type Corynebacterium pekinense AS 1.299 which is taken as a starting strain, and screening by using a neomycin-containing culture medium; and the Corynebacterium pekinense can greatly reduce the yield of lactic acid in the fermentation process, particularly in the fermentation of L-glutamic acid, so that the problem about the inhibition of the lactic acid is solved, and the production of a final metabolite is facilitated. Therefore, the Corynebacterium pekinense of which the collection number is CGMCC No. 5923 can be widely applied to the fermentation to reduce the lactic acid.

An aspartokinase mutant, an engineering bacterium and a preparation method of the mutant belong to the technical field of bioengineering. The high-enzyme activity aspartokinase mutant of the present invention is an exogenous aspartokinase whose amino acid sequence is shown in SEQ ID NO: 2 after 2-10, further 2-6, and further 2 A sequence formed by substitution, deletion or addition of ~3 amino acid residues, and has the function of aspartokinase. A sequence formed by substitution, deletion or addition of two amino acid residues is preferred, and it is particularly preferred to perform site-directed saturation mutations on amino acids at positions 372 and 379 in the amino acid sequence, and use a high-throughput screening method Selection of high enzymatic activity aspartokinase mutants. The present invention further utilizes the electroporation method to transfer the pEC-AK recombinant shuttle expression vector of the aspartokinase mutant with high enzyme activity and release or weaken Lys feedback inhibition into Corynebacterium Beijing, and finally obtain the recombinant Corynebacterium Beijing M372I ‑T379S engineering bacteria, and its fermentation product analysis.

The invention discloses a method for converting 4'- demethylpodophyllotoxin to 4'- demethylation epipodophyllic acid, comprising the following steps: the 4'- demethylpodophyllotoxin solution is added during the fermentation process of microorganism clostridium, pseudomonas aeruginosa, rhodococcus erythropolis, corynebacterium pekinense, hay bacillus, erwinia uredovora, bacillus or bending pseudomonas for carrying out biotransformation reaction, thus obtaining biotransformation matrix with the 4'-demethylation epipodophyllic acid. The invention also discloses a method for separating the 4'-demethylation epipodophyllic acid from the biotransformation matrix, comprising the following steps: the macroporous absorbent resin column is adopted to carry out initial separation on the biotransformation matrix and gel column chromatography is adopted to carry out fine separation, thus obtaining 4'-demethylation epipodophyllic acid. In the invention, modification is carried out on the 4'- demethylpodophyllotoxin structure by biotransformation, thus obtaining 4'-demethylation epipodophyllic acid, in addition, the reaction selectivity is high, the operation is easy, the reaction conditions are moderate, the generated waste is little, the separation process is simple and the yield is high.

The invention relates to a colibacillus-corynebacterium shuttle constitutive expression carrier and a construction method thereof, which belong to the technical field of gene engineering. In the invention, the expression carrier pDXW-10 can be reproduced in colibacillus and corynebacterium, exists in the colibacillus and the corynebacterium stably and contains a tac-M promoter with a transcription initiation function and a terminator rrnBT1T2 with a transcription termination function in both the colibacillus and the corynebacterium; the expression carrier pDXW-10 contains a resistance gene for marking resistance marking kanamycin used for selecting a corynebacterium transformant; and the expression carrier pDXW-10 contains multiple cloning sites L-MCS containing 11 single restriction enzyme tangent points. In the corynebacterium, the carrier has moderate level for expressing foreign proteins and is especially suitable for the research of the metabolic engineering of the corynebacterium.

The invention relates to the field of microorganisms and discloses a corynebacterium pekinense, wherein the collection number thereof is CGMCC No.5361. The corynebacterium pekinense with the collection number of CGMCC No.5361 takes a wild corynebacterium pekinense with the collection number of CICC No.21721 as a parent strain, and is prepared by performing chemical mutagenesis and screening through a culture medium containing neomycin; and the capability of generating L-lysine through fermentation is obviously higher than that of the wild corynebacterium pekinense, and the yield of the L-lysine is increased by 14.7 percent, so that the corynebacterium pekinense with the collection number of CGMCC No.5361 is widely applied to the fermentation of the L-lysine.

The invention discloses a synergistic agent and a preparation method thereof, wherein the synergistic agent comprises the following raw materials according to proportion by weight: 70.8-87.5 parts of stone potassium, 3-8 parts of polyaspartic acid, 3-8 parts of maleic anhydride, 0.3-0.5 parts of azone, 5-10 parts of urea or ammonium hydrogen carbonate, 0.4-0.7 parts of d bacteria liquid, 0.3-0.8 parts of EDTA (Ethylene Diamine Tetraacetic Acid) and 0.2-0.5 parts of n-butyl alcohol. The preparation method of the stone potassium comprises the following steps: respectively crashing 50 parts of zeolite ore, 20 parts of phosphorite and 30 parts of leopoldite into 100-200 meshes and then uniformly mixing so as to obtain a mixture; taking 73.5-87.3 parts of mixture, 2-4 parts of urea, 2-5 parts of phosphorus pentoxide, 1-2 parts of potassium sulfate, 0.2-0.5 parts of ammonium molybdate or sodium molybdate, 1-2 parts of manganous sulfate, 3-6 parts of ferrous sulfate, 1-2 parts of zinc sulfate, 1-2 parts of sodium borate, 0.5-1 parts of copper sulfate and 1-2 parts of fulvic acid; and stirring and sealing up for keeping standby. The preparation method of the bacteria liquid comprises the following steps: uniformly mixing colon bacillus, Fusarium moniliforme, Corynebacterium pekinense, Streptomyces jingyangensis, Bacillus megatherium, Bacillus mucilaginosus and Streptomyces according to a proportion of 0.5%: 0.5%: 0.5%: 0.5%: 0.5%: 0.5%: 0.5%. The synergistic agent is multipurpose, nutritious, low in cost, non-toxic, nuisanceless and free of residue.

The invention relates to the field of microorganisms and discloses Corynebacterium pekinense with the preservation number of CGMCC (China General Microbiological Culture Collection Center) No.5924. The Corynebacterium pekinense MHZ-0911 with the preservation number of CGMCC No.5924 takes wild type Corynebacterium pekinense CICC (China Center of Industrial Culture Collection) 21721 as an initial strain and is obtained by inducing through a chemical mutagen and screening through a culture medium containing streptomycin. According to the Corynebacterium pekinense, the yield of lactic acid in the fermentation process can be greatly reduced, in particular in the fermentation process of L-lysine, and thus the inhibition of the lactic acid is improved and the generation of final metabolite is facilitated. Therefore, the Corynebacterium pekinense with the preservation number of CGMCC No.5924 can be widely applied to the reduction of the generation of the lactic acid in the fermentation process.