35 results about "Propanediol oxidoreductase" patented technology

Recombinant organisms are provided comprising genes encoding aquacobalamin reductase, cob(II)alamin reductase, cob(I)alamin adenosyltransferase, glycerol dehydratase and 1,3-propanediol oxidoreductase activities useful for the production of 1,3-propanediol from a variety of carbon substrates. More specifically the following nucleotide sequences are provided: btuR, encoding the E. coli cob(I)alamin adenosyltransferase enzyme; cobA, encoding the Salmonella typhimurium cob(I)alamin adenosyltransferase enzyme; cobO, encoding the Pseudomonas denitrificans cob(I)alamin adenosyltransferase enzyme; dhaB1, encoding the α subunit of the Klebsiella glycerol dehydratase enzyme; dhaB2, encoding the β subunit of the Klebsiella glycerol dehydratase enzyme; dhaB3, encoding the γ subunit of the Klebsiella glycerol dehydratase enzyme; dhaT, encoding Klebsiella oxidoreductase enzyme; the yciK gene isolated from E. coli; the glucose isomerase promoter sequence from Streptomyces; and the N-terminal amino acid sequence for cob(II)alamin reductase from Pseudomonas denitrificans.

The invention provides a method for improving the microbial production of 1,3-propanediol by constructing a gene engineering bacterium. The method comprises the following steps: constructing an expression vector with the inserted malic enzyme gene; delivering the expression vector in host bacteria generating 1,3-propanediol; adding an inducer to induce the overexpression of the malic enzyme gene in the fermentation and culture process; and adopting the aerobic fermentation means and performing the fed batch of substrate glycerol to produce 1,3-propanediol. The method is characterized in that the constructed gene engineering bacterium can express more malic enzyme than the original strain in the fermentation process, thus the convertion from pyruvic acid to malic acid can be promoted, the circulation of tricarboxylic acid can be promoted, the bacterium can generate more nicotinamide adenine dinueleotide (NADH) and energy (ATP), the activity of 1,3-propanediol oxidation-reduction enzymein the bacterium and the glycerol conversion rate can be increased. The invention has the following advantages: the substrate glycerol utilization rate of the producing bacterium can be increased, the concentration and production strength of the fermented 1,3-propanediol can be obviously increased, the yield of 1,3-propanediol can be increased and the production cost can be reduced.

The invention belongs to the biochemical field and discloses a 1, 3-propylene glycol genetic engineering bacterium and a preparation method and application thereof. The strain is classified and named as Klebsiella pneumoniae ATCC 25955-pUC18-yqhD-Tet<R>, and is obtained by connection of a 3-propylene redoxase isozyme gene yqhD from Escherichia coli and a tetracycline resistant gene Tet<R> from a plasmid pHY300PLK, insertion of a carrier pUC18 and conversion of Klebsiella pneumoniae ATCC 25955. The bacterium can obviously improve the capacity for conversion of glycerol into 1, 3-propylene glycol, improve the utilization ability and the conversion rate of the substrate glycerol and the final concentration of the final offspring 1, 3-propylene glycol, simultaneously shorten the fermentation time, and is convenient for industrial production of the 1, 3-propylene glycol through the microbial fermentation method.

The invention relates to new glycerin dehydrase gene cloning and its expression in relative host. The enzyme gene is cloned form clostridium perfringens which can transform the glycerin into 3-hydroxyl propionic aldehyde at normal biological chemical reacting condition. Based on the invention, it can recombine the 1,3-propylene glycol redox enzyme relative gene into Escherichia coli to gain a new metabolism engineering fungus which can be transformed into 1, 3-propylene glycol by fermenting tapioca hydrolyzate, glucose, or glycerol.

The invention discloses a 1, 3-propanediol oxidation reductase isozyme variant gene Gln202Ala and the use. Mediated random mutation of fallible PCR technology is used for screening and getting 1, 3-propanediol oxidation reductase isozyme variant gene. Codon CAG of glutamine of No. 202 in the gene is mutated into a codon GCG of Alanine, thereby getting 1, 3-propanediol oxidation reductase isozyme variant gene Gln202Ala. The nucleotide sequence of the mutated gene is SEQID No.1, which can encode 1, 3-propanediol oxidation reductase isozyme mutations. The variant gene Gln202Ala is reassembled for expressing 1, 3-propanediol oxidation reductase isozyme mutations through gene engineering technology, which is used for catalyzing hydroxy-propionaldehyde and producing 1, 3-propanediol. The invention has the advantages of improving activity by 1.5 to 2 times and providing wide application prospect for chemical raw material 1, 3-propanediol of biotransformation.

The invention relates to a 1,3-propylene glycol genetically engineered bacterium and a method for producing 1,3-propylene glycol by mixing and converting the 1,3-propylene glycol genetically engineered bacterium, and belongs to the field of biotechnology. A PCR (Polymerase Chain Reaction) technology is used for cloning a 1,3-propylene glycol oxidation-reduction enzyme dhaT gene derived from lactobacillus brevis (Lactobacillibrevis CICC6239) so as to construct a genetically engineered strain E.coli-pSE-dhaT which is capable of efficiently and actively expressing the 1,3-propylene glycol oxidation-reduction enzyme (1,3-propanedioldehydrogenase, PDOR). The experiment proves that the enzymatic activity of the 1,3-propylene glycol oxidation-reduction enzyme expressed by the recombinant bacteria is increased by 16 times; the engineered bacterium and the lactobacillus brevis are mixed, stand still and are converted to glycerin, and the conversation rate from the glycerin to the 1,3-propylene glycol can reach 80.6%.

Recombinant organisms are provided comprising genes encoding genes encoding glycerol dehydratase, 1,3-propanediol, 1,3-propanediol oxidoreductase, a gene encoding vitamin B12 receptor precursor (BtuB), a gene encoding vitamin B12 transport system permease protein (BtuC) and a gene encoding vitamin B12 transport ATP-binding protein (BtuD). The recombinant microorganism is contacted with a carbon substrate and 1,3-propanediol is isolated from the growth media.

The invention discloses a preparing method of restructuring strain in biological technical domain, which comprises the following steps: adopting PCR technique; cloning dhaT gene from pneumonic klebsiella DSM 2026; constructing bacillus coli expressing carrier pET-dhaT with dhaT gene; transferring into bacillus coli DH5 alpha; proceeding plasmid reproduction; extracting recombinant plasmid; transferring to bacillus coli BL21(DE3); getting recombination gene engineering strain E. coli-pET-dhaT to express 1, 3-propanediol oxidoreductase (PDOR). This strain can get stable PDOR under the condition of non-antibiotic selective pressure.

The invention relates to a recombinant klebsiella which starts subexpression with kanamycin resistant gene and the application thereof, which belongs to the technical field of gene engineering. The invention provides a recombinant klebsiella to improve the yield of 1,3-propanediol(PDO) and the classification and nomenclature of the recombinant klebsiella is klebsiella (klebsiella sp.) pETPkan-dhaT, the recombinant klebsiella has been preserved at China Center for Type Culture Collection (CCTCC) with an accession number of CCTCC NO:M 208135. The application is to use the gene dhaT from klebsiella 1,3-propanediol redox enzyme to construct a klebsiella expression vector pETPkan-dhaT; to introduce the klebsiella expression vector into the klebsiella to obtain the recombinant klebsiella pETPkan-dhaT, and to enhance the expression of dhaT gene and realize that the accumulation of an intermediate product 3-glyceraldehyde decreases obviously, and the yield of 1,3- PDO increases by 16.9 percent than the counterpart during the course that the recombinant klebsiella has glycerol as a substrate. The method lays a solid foundation for the high yield of 1,3- PDO or the yield of 1,3- PDO klebsiella gene engineering with glucose as a substrate.

The invention belongs to the technical field of bioengineering and specifically relates to a method for producing 1,3-propanediol from whole-cell mixed conversion glycerinum. The method for producing1,3-propanediol from the whole-cell mixed conversion glycerinum disclosed by the invention comprises the following specific steps: firstly, preparing clostridium butyricum XYB11 thallus and E.coli-Cb-dhaT thallus; then mixing the two kinds of thallus according to a certain proportion to obtain mixed whole cells; finally, adding the mixed whole cells into a conversion solution containing glycerinumand oscillating and converting to obtain 1,3-propanediol under the certain condition. By means of the method for producing the 1,3-propanediol from whole-cell mixed conversion glycerinum disclosed bythe invention, 3-HPA accumulation in a metabolic pathway is reduced, a utilization rate of the glycerinum is improved, and a 1,3-PD yield is increased; enzyme activity of 1,3-propanediol oxidordeuctase in the E.coli-Cb-dhaT can reach 98U/mg; a conversion rate of the glycerinum can reach 84.9%. The whole cell preparation method disclosed by the invention has the advantage of simpleness; only washing the thallus again is needed, a complex enzyme separating and purifying process is avoided, enzyme is fixed in the cells, reaction conditions are moderate, production cost is reduced, and a wide industrial application prospect is achieved.

The invention relates to the clone of a novel glycerol dehydratase activating factor gene and the expression thereof in related host. The activating factor gene, cloned from clostridium perfringens, can activate an inactive glycerol dehydratase under normal biochemical reaction conditions and recover the enzyme activity of the glycerol dehydratase, and can also enable the glycerol dehydratase to be difficult to be inactivated when the glycerol dehydratase is transformed to glycerin in the reaction. On the basis of the invention, related enzyme genes, such as the glycerol dehydratase, 1, 3-propanediol oxidoreductase, can be restructured to colon bacillus so as to get novel metabolic engineering bacteria. The metabolic engineering bacteria transform starch, glycerin or glucose to 1, 3-propanediol through fermentation.

The invention relates to a genetic engineering strain for efficiently producing 1,3-propanediol, a construction method for the genetic engineering strain and application of the genetic engineering strain. According to the genetic engineering strain, the construction method therefor and the application of the genetic engineering strain, the enzyme activity of 1,3-propanediol oxidoreductase is improved through strengthening expression of the 1,3-propanediol oxidoreductase in Klebsiella pneumoniae, meanwhile, a NADH regeneration way is constructed, thus, the accumulation of 3-hydroxypropanal is lowered, the conversion of the 1,3-propanediol from the 3-hydroxypropanal is strengthened, and thus, the yield of the 1,3-propanediol is increased. The enzyme activity of the genetic engineering strain, i.e., the 1,3-propanediol oxidoreductase, constructed by the method is 3.25 to 3.5 times that of a starting strain; and the enzyme activity of formate dehydrogenase is 0.414U/mg to 0.45U/mg. Throughcarrying out fed-batch fermentation for 29 hours by employing the genetic engineering strain constructed by the method, the yield of the 1,3-propanediol is increased by 43.89%-97.93% compared with that of the starting strain; and due to a dual-gene synergistic effect, the output and yield of the 1,3-propanediol are increased remarkably.

The invention relates to the technical field of synthetic biology and microbial fermentation, in particular to modification of deoxyribose-5-phosphate aldolase through semi-rational design and overexpression of four enzymes in recombinant escherichia coli, namely methanol dehydrogenase, ethanol dehydrogenase, deoxyribose-5-phosphate aldolase, 1, 3-propylene glycol oxidoreductase or 1, 3-propylene glycol oxidoreductase isozyme, to construct unnatural 1, 3-propylene glycol from methanol, a formaldehyde-carbon compound, ethanol and acetaldehyde. The activity of the DERATMAS233D mutant screened by the invention is improved by 51% compared with that of a wild type enzyme; When the conversion from formaldehyde and ethanol to PDO by using escherichia coli, the yield of PDO is increased by 21.8%; when the formaldehyde and the acetaldehyde are converted into the PDO, the yield of the PDO is increased by 9.2%, the synthesis route of the PDO is greatly shortened, and the yield of the PDO is increased.

The invention discloses a 1,3-propylene glycol oxidoreductase isozyme mutant, and a gene and application thereof. The 1,3-propylene glycol oxidoreductase isozyme mutant, provided by the invention, has activity for catalyzing 3-hydroxypropionaldehyde to generate 1,3-propylene glycol, and is 1,3-propylene glycol oxidoreductase isozyme containing Q202H mutation. A variant gene is measured by an enzyme kinetics curve; in comparison with the 1,3-propylene glycol oxidoreductase isozyme mutant, the catalysis efficiency is remarkably improved, and the wide application prospect is provided for biological production of 1,3-propylene glycol.

The invention provides a genetically engineered bacterium for co-production of 3-hydroxypropionic acid and 1,3-propylene glycol as well as a construction method and application of the genetically engineered bacterium, and belongs to the technical field of bioengineering. According to the invention, a genetic engineering means is utilized to construct the genetically engineered bacterium for combined expression of succinate semialdehyde dehydrogenase (GabD4) and 1,3-propylene glycol oxidordeuctase (PduQ) on the basis of E.coli BL21, and the expression quantity of the balanced double enzymes isimproved through an UTR engineering technology; and moreover, the constructed genetically engineered bacterium and lactobacillus reuteri are subjected to multi-bacterium mixing to convert glycerin, sothat efficient co-production of the 3-hydroxypropionic acid and the 1,3-propylene glycol is realized.