138 results about "Isomerase Gene" patented technology

The invention discloses a high-yield N-acetylglucosamine metabolic engineering bacterium, as well a construction method and applications thereof. The engineering bacterium is a recombinant Escherichia coli by leading a coded UDP-N-acetylglucosamine epimerase gene and a coded 6-glucosamine phosphate synthetase gene into Escherichia coli for expression, and knocking out the gene N-acetylglucosamine in the Escherichia coli to decompose and utilize metabolic pathway enzyme; and the constructed engineering bacterium strain utilizes glucose as a substrate for fermenting and culturing and synthesizing the N-acetylglucosamine. The engineering bacterium is high in the fermenting level of synthesizing the N-acetylglucosamine by utilizing glucose, the accumulation of side products is less, and industrial production potential capability can be achieved.

The invention belongs to the technical field of bioengineering, and particularly relates to a genetic engineering strain capable of effectively secreting D-psicose 3-epimerase and a construction method thereof. A D-psicose 3-epimerase gene rdpe from rumen bacterium Ruminococcus sp. 5_1_39B_FAA is obtained firstly, recombinant plasmid pMA5-RDPE construction and bacillus subtilis conversion are conducted, and then constitutive and secretive expression of RDPE in bacillus subtilis is achieved. By comparing three glucose-induced promoters, the optimal inducible promoter P[xylA] is obtained, and the RDPE secretion level is increased remarkably. By knocking out the xylose utilization gene xylAB (xylA and xylB), the xylose metabolism pathway of bacillus subtilis is blocked, the secretion amount of RDPE is further increased, and the optimal induced concentration of the inducer xylose is reduced to 0.5% from 4.0%. Finally, the engineered strain 1A751SD-XR is evaluated in a 7.5 L fermentation tank, and the RDPE secretion level can be as high as 95 U / mL and 2.6 g / L.

The invention discloses a tobacco carotenoid isomerase gene. The base sequence of the tobacco carotenoid isomerase gene is represented by SEQIDNO:1. In tobacco, a key carotenoid synthesis gene NtCRTISO is cloned, and the gene can be inhibited to effectively improve the carotenoid content of tobacco leaf and improve the photoinhibition resistance of tobacco plants. The invention discloses an important function of the CRTISO gene in tobacco in carotenoid synthesis. The CRTISO gene plays a great role in the regulation of the composition of carotenoid. A method for improving the content of carotenoid, especially beta-carotene, in the tobacco is searched, and a good theoretic guidance is provided for the improvement of the molecules of the plants.

The invention discloses a method for preparing farnesene by using a biodiesel by-product. The method comprises the steps of purification of the biodiesel by-product, wherein the purity of the purified glycerin reaches 63.8% (w / w), building of a recombinant host cell for preparing farnesene from the purified glycerin as the raw material, wherein the recombinant host cell comprises related genes in a mevalonate pathway or deoxymutulose-5-hexose monophosphate pathway, an isopentene pyrophosphate isomerase gene, a farnesene isopentenyl pyrophosphate synthetase gene and a farnesene synthetase gene. The method also comprises fermentation of the purified glycerin as the raw material in the recombinant host cell to prepare the farnesene, wherein the concentration of the obtained farnesene is 0.025g / L; and optimum construction of the recombinant host cell capable of improving the yield of the farnesene by employing the purified glycerin as the raw material, wherein the concentration of the obtained farnesene reaches 2.9g / L, and the concentration is improved by 115 times in comparison with that before optimization.

The invention belongs to the technical field of genetic engineering, and particularly relates to a genetically engineered bacterium for producing N-acetylneuraminic acid through xylose induction. Escherichia coli is used as a starting strain, an N-acetylglucosamine synthesis pathway is integrated on a genome, an N-acetylglucosamine 2-epimerase gene bAGE and an N-acetylneuraminic acid synthetase gene neuB from collar algae are introduced, an N-acetylneuraminic acid synthesis pathway is constructed, and a key gene nano ATEK of a catabolism pathway of the N-acetylneuraminic acid is knocked out. Meanwhile, metabolic pathways of precursor substances required by synthesis of the N-acetylneuraminic acid are subjected to multi-copy reinforcement, part of bypass metabolic pathways are knocked out, key enzyme genes for producing GlcNAc and Neu5Ac are optimized according to different copy numbers, the optimal proportion of the key enzyme genes is finally determined, and the high-yield strain of the N-acetylneuraminic acid is obtained. The highest yield of the N-acetylneuraminic acid can reach 28g / L, the highest production intensity can reach 0.67 g / (L*h) which is the highest value reported at present, and the N-acetylneuraminic acid has important industrial application value.

The invention discloses a protein used for controlling the content of anthocyanidin, a coding gene thereof, and an application thereof. The invention discloses a paddy rice chalcone isomerase (CHI), a coding gene thereof, and an application thereof. The protein is represented by the following (1) or (2): (1) a protein composed of an amino acid residue sequence of SEQ ID No.2 in a sequence list; (2) a protein with a same activity as that of the amino acid residue sequence of SEQ ID No.2, wherein the protein is derived from the amino acid residue sequence of SEQ ID No.2 through substitution and / or deletion and / or addition of one or more amino acid residues. The paddy rice CHI gene provided by the invention can be used as a molecular marker and assists in paddy rice seed breeding. The paddy rice CHI gene also has an important value on the study of reasonable utilization of rice hulls.

The invention discloses a chondroitin producing genetic engineering bacterium, a method for constructing the same and application of the chondroitin producing genetic engineering bacterium, and belongs to the technical field of genetic engineering. Chondroitin synthetase genes and UDP (uridine diphosphate)-glucosamine isomerase genes are transferred into corynebacterium glutamicum to obtain the chondroitin producing genetic engineering bacterium. The chondroitin producing genetic engineering bacterium, the method and the application have the advantages that the corynebacterium glutamicum is used as a host for the chondroitin producing genetic engineering bacterium, is a GRAS (generally recognized as safe) strain affirmed by the Food and Drug Administration of the America, does not secreteoptional endotoxin or exotoxin, is safe and can be applied to producing amino acid or food additives and the like for a long term, and chondroitin produced by the chondroitin producing genetic engineering bacterium is high in molecular weight and good in yield; the chondroitin yield of preferable recombinant bacteria of the chondroitin producing genetic engineering bacterium can reach 3.7 g / L, chondroitin products with high molecular weights can be produced by the chondroitin producing genetic engineering bacterium, and accordingly the chondroitin producing genetic engineering bacterium has anexcellent industrial prospect and can be effectively applied to medicines and health protection.

The invention provides application of arabidopsis thaliana UDP-glucose 4-isomerase gene At-UGE2, an overexpression mutant strain 35S:UGE2 and a deletion mutant strain uge2 in adjustment of plant yield correlated characters, adversity resistance characters and the like. The function of biological synthesis and conversion of the UDP-glucose and UDP-galactose, which are catalyzed by UDP-glucose 4-isomerase, in adjustment of plant growth and development as well as adversity stress response is disclosed, a high-quality gene is provided for plant variety improvement, a new method and a new mechanism for improving plant yield characters and adversity resistance abilities are explained, and important economic significance and application value are achieved.

The invention discloses a safflower chalcone isomerase (CHI) gene. The RNA (Ribonucleic Acid) of safflower pedals is reversely transcribed into a cDNA (Complementary Deoxyribonucleic Acid), the cDNA is used as a template to carry out 3' and 5' race cloning, the 3' and 5' end sequences of the safflower CHI gene are respectively obtained, a safflower CHI sequence is obtained through splicing of the 3' and 5' end sequences, the whole gene length is 1161bp, and the length of an opening reading frame is 654bp. The safflower CHI gene is named ct-(i)CHI( / i), and the result of the sequence comparison and analysis of the safflower CHI gene on ncbi (National Center for Biotechnology Information) shows that the homology of the gene with a dutchmanspipe root CHI gene reaches 82%. Experiments show that the synthesis of flavone can be promoted by the over-expression ct-(i)CHI( / i) gene, the flavone content can be lowered after the ct-(i)CHI( / i) gene is inhibited, and the safflower CHI gene has wide prospects in the aspect of cultivating high-content flavonoids transgenic plants.

The invention belongs to the technical field of bioengineering, and particularly relates to a genetic engineering strain capable of effectively secreting D-psicose 3-epimerase and a construction method thereof. A D-psicose 3-epimerase gene rdpe from rumen bacterium Ruminococcus sp. 5_1_39B_FAA is obtained firstly, recombinant plasmid pMA5-RDPE construction and bacillus subtilis conversion are conducted, and then constitutive and secretive expression of RDPE in bacillus subtilis is achieved. By comparing three glucose-induced promoters, the optimal inducible promoter P[xylA] is obtained, and the RDPE secretion level is increased remarkably. By knocking out the xylose utilization gene xylAB (xylA and xylB), the xylose metabolism pathway of bacillus subtilis is blocked, the secretion amount of RDPE is further increased, and the optimal induced concentration of the inducer xylose is reduced to 0.5% from 4.0%. Finally, the engineered strain 1A751SD-XR is evaluated in a 7.5 L fermentation tank, and the RDPE secretion level can be as high as 95 U / mL and 2.6 g / L.