428 results about "Transferase Gene" patented technology

The invention relates to the genetic manipulation of non-human animals. More particularly, the invention relates to genetic manipulation of non-human animals to be used for xenotransplantation. The invention provides viable gene knockout swine including swine in which the α(1,3)-galactosyltransferase gene has been disrupted, methods for making such swine, and methods of using the tissues and organs of such swine for xenotransplantation.

The invention provides genetically engineered bacteria for efficiently producing N-acetylglucosamine. The genetically engineered bacteria are prepared by the following steps: integrating chromosome deficiency nag DCABE gene clusters of Escherichia coli, respectively connecting 6-glucosamine phosphate synthetase mutant genes and N-acetylglucosamine transferase genes which are respectively mediated by a T7 promoter and a Trc promoter with a gene expression cassette in series, wherein the 6-glucosamine phosphate synthetase mutant genes are obtained by mutating wild 6-glucosamine phosphate synthetase genes from an Escherichia coli W3110 strain source into A38T/R249C/G471S mutants. The genetically engineered bacteria constructed by the invention have the advantages of high N-acetylglucosamine fermentation yield and high strain stability and have wide industrial application prospects.

The invention discloses Pichia pastoris strain with alpha-1, 6-mannosyl transferase absent and the establishing method, which belongs to the biological engineering field. The collection number of the Pichia pastoris strain with alpha-1, 6-mannosyl transferase absent is CGMCC No.1853. The invention has the advantages that the Pichia pastoris strain with alpha-1, 6-mannosyl transferase absent built by the invention can prevent the generation of excessive manna saccharify, when expressing extrinsic glucoprotein, reduce the immunogenicity of the pressed protein, and therefore, the invention has important application value in the biomedical field, and other fields; simultaneously, the strain can also be applied to the further gene knockout or the metabolic engineering reconstruction. The invention also builds a method for knocking out the alpha-1, 6-mannosyl transferase gene through secondary homologous recombination, mutant strain can be relatively easily obtained through the method, therefore the sieving workload is greatly reduced, and the success ratio is improved.

The invention relates to a separated deoxyribose nucleic acid (DNA) sequence. The DNA sequence comprises a nucleotide sequence (a) of SEQIDNO.1 or SEQIDNO.2; or a nucleotide sequence (b) complementary with the nucleotide sequence (a). The invention further provides a recombinant expression vector containing the nucleotide sequence, a genetic engineering host cell and application of the nucleotide sequence, the recombinant expression vector and the host cell for encoding the diacylglycerol acyltransferase or producing triacylglycerol. The DNA sequence has the advantages that a cDNA full-length sequence and a DNA full-length sequence of a parietchloris incise diacylglycerol acyltransferase gene are obtained by screening, encoded protein of the gene has a triacylglycerol synthesis capability by expression of the gene in a TAG synthesis defect strain H1246 of yeast, and conditions are created for utilizing the gene to achieve large-scale synthesis of triacylglycerol by genetic operation.

The invention provides recombinant bacillus subtilis for synthesizing 2'-fucosyllactose and an establishment method and application of recombinant bacillus subtilis. Recombinant bacillus subtilis is obtained in the mode that a lactose transport enzyme gene is subjected to reinforcement expression in a gene group of bacillus subtilis 168, and exogenous fucosyltransferase, fucokinase and gtp-mannose-1-phosphate guanylyltransferase genes are expressed. According to recombinant bacillus subtilis, the lactose transport enzyme gene is subjected to reinforcement expression on the gene group, expression of the lactose transport enzyme is effectively reinforced, the efficiency of transferring exogenous lactose into cytoplasm is improved, the concentration of lactose in cytoplasm is increased, and synthesis of 2'-fucosyllactose is promoted. The establishment method of recombinant bacillus subtilis is simple and convenient to use and has good application prospects.

The invention discloses a nicotinamide mononucleotide adenylyltransferase (Nmnat) mutant as well as a coding gene and an application thereof. The Nmnat mutant is obtained through point mutation of a sequence 2 in a sequence table and point mutation is mutation of at least one of the 119 site, the 149 site and the 59 site of the sequence. The Nmnat mutant with high catalytic activity is finally obtained through site-specific mutagenesis of the gene sequence of Nmnat. The mutant can be efficiently purified through a simple purification scheme, thus reducing the production cost of NAD (nicotinamide adenine dinucleotide) and improving the market competitiveness of corresponding products.

The invention belongs to the field of bioengineering and provides an Echinococcus granulosusglutathione transferase gene a base sequence of which is shown in SEQ ID NO: 1. The invention also provides a protein encoded by the Echinococcus granulosusglutathione transferase gene. The amino acid sequence of the protein encoded by the Echinococcus granulosusglutathione transferase gene is shown in SEQ ID NO: 2, or is the same as 1st-219th amino acid sequences as shown in SEQ ID NO: 3. The recombinant protein can be used for immunodiagnosis of cystic echinococcosis patients and can be used for coating a plate; and the serums of the patients having cystic echinococcosis, alveolitoid echinococcosis, cysticercosis and other parasite diseases and healthy people are detected by using an enzyme-linked immunosorbent assay (ELISA), and the obtained sensitivity and specificity are respectively 72.41% and 92.36%.

The invention provides recombinant bacillus subtilis for synthesizing lactyl-N-neotetraose. The recombinant bacillus subtilis is integrated with lactose permease genes in a recombinant manner on bacillus subtilis 168 genome and converts plasmids which contain beta-1,3-N-glucoaminotransferase genes and beta-1,4-galactosyltransferase gene in bacillus subtilis 168. Uridine diphosphate galactose and acetylglucosamine uridine diphosphate in a metabolic pathway of the bacillus subtilis are used as precusor substances, lactose only needs to be added exogenously and is transferred into cells under theeffect of lactamase to synthesize the lactyl-N-neotetraose which is secreted to ectoenzyme. The accumulation amount of the lactyl-N-neotetraose synthesized by the recombinant bacillus subtilis reaches 1071 mg/L, and a foundation is laid for production of the lactyl-N-neotetraose through further metabolic engineering modified bacillus subtilis.

The invention discloses a mangosteen glycosyltransferase gene (i)UGT74AC1(/i) and application of glycosyltransferase with a gene (i)UGT74AC1(/i) code in synthetic mogrosideIE. The glycosyltransferase gene (i)UGT74AC1(/i) has a nucleotide coding sequence shown in SEQIDNO.1 and a peptide sequence shown in SEQIDNO.2. By utilization of an expression of the mangosteen glycosyltransferase gene (i)UGT74AC1(/i) in escherichia coli, the recombinant glycosyltransferase (i)UGT74AC1(/i) can catalyze mogrol and UDP-glucose to react, thereby generating the mogrosideIE. The glycosyltransferase gene (i)UGT74AC1(/i) disclosed by the invention can be applied to the artificial synthesis of the mogrosideIE. Meanwhile, the gene has an important application value in the aspect of improving momordica grosvenori by the utilization of a transgenic technology to improve the content of the mogroside.

The invention discloses an acetyl coenzyme A acetyltransferase gene RKAcaT2 and application thereof. The nucleotide sequence of the gene is shown in SEQ ID NO:1, the amino acid sequence encoded by thegene is shown in SEQ ID NO:2, the gene is a key enzyme gene synthesized by carotenoid in Rhodosporidium kratochvilovae YM25235 and has the functions of the acetyl coenzyme A acetyltransferase, and the carotenoid produced by the Rhodosporidium kratochvilovae YM25235 can be controlled; microorganisms are transformed through the genetic engineering means so as to increase the yield of carotenoid inthe microorganisms, and a foundation is laid for large-scale commercial production of the carotenoid.

The invention discloses a nicotinamide mononucleotide adenylyl transferase gene. The nucleotide sequence of the gene is shown as SEQ ID NO: 1. The amino acid sequence of the gene is shown as SEQ ID NO:2. The invention also discloses an expression vector; a method comprises the steps of using the expression vector for transforming the host cell, culturing a transformant, and acquiring nicotinamide mononucleotide adenylyl transferase gene from culture, so as to obtain the recombinant nicotinamide mononucleotide adenylyl transferase gene. The invention discloses application of the recombinant nicotinamide mononucleotide adenylyl transferase gene to in vitro conversion of nicotinamide mononucleoside NMN into nicotinamide adenine dinucleotide NAD<+>. The invention also discloses a synthesis method of nicotinamide adenine dinucleotide NAD<+>. The method uses nicotinamide mononucleoside NMN as raw material to generate nicotinamide adenine dinucleotide NAD<+> under the action of the recombinant nicotinamide mononucleotide adenylyl transferase gene.

Human pre-formed xenoantibodies play an important role in the hyperacute rejection response in human xenotransplantation. Disclosed are materials and methods for removing or neutralizing such antibodies. Also disclosed are materials and methods for reducing or eliminating the epitopes in the donor organs that are recognized by such antibodies. Such epitopes are formed as the result of activity by the enzyme α-1,3 galactosyltransferase. The porcine gene encoding α-1,3 galactosyltransferase is disclosed, as are materials and methods for inactivating (“knocking out”) the α-1,3 galactosyltransferase gene in mammalian cells and embryos. Included are nucleic acid constructs useful for inactivating the α-1,3 galactosyltransferase gene in a target cell. Also disclosed is a novel leukemia inhibitory factor (T-LIF) that is useful for maintenance of embryonic stem cells and primordial germ cells in culture.

The invention discloses application of a glycosyltransferase gene UGT85A5 of Arabidopsis thaliana to the improvement of salt tolerance of plants. A nucleotide sequence of the glycosyltransferase gene UGT85A5 is shown as SEQ ID No.1; and the glycosyltransferase gene UGT85A5 is cloned from the Arabidopsis thaliana by a reverse transcription-polymerase chain reaction (RT-PCR) technology. The gene UGT85A5 is utilized to construct a plant overexpression vector and perform transgenic operation of the plants to obtain transgenic plants. The detection shows that the salt tolerance of the transgenic plants is remarkably improved, so that a novel salt-tolerant plant can be created after the invention is implemented; and the gene can be used for subsequent crop variety improvement, and has a great significance for the agricultural production in China.

The invention discloses an application of an arabidopsis glycosyl transferase gene UGT 76C2 in improving plant drought resistance, wherein the nucleotide sequence of the glycosyl transferase gene UGT 76C2 is shown as SEQ ID No.1, and is cloned from arabidopsis through a reverse transcription-polymerase chain reaction (RT-PCR) technology. The application utilizes the gene UGT 76C2 to structure a plant over expression carrier, the plant transgenic operation is carried out, and a transgenic plant is obtained. Tests prove that drought resistance of the transgenic plant is obviously improved, and indicate that a novel drought-resistant plant can be created after the glycosyl transferase gene UGT 76C2 is implemented; and the glycosyl transferase gene UGT 76C2 can be used for subsequent crop variety improvement, and has an important meaning to agricultural production of China.

The invention discloses application of a guided glycosyltransferase gene, namely application of the guided glycosyltransferase gene cps2E and cps4E in improving lactobacillus plantarum extracellular polysaccharide synthesis; the cps2E and cps4E genes and a temperature-sensitive plasmid pFED760 are recombined to construct a knockout vector, the knockout vector is guided into food-borne lactobacillus plantarum competent cells, and then by means of homologous recombination, cps2E and cps4E genes are constructed to knock out strains YM 4-3-deltacps2E, YM 4-3-deltacps4E and YM 4-3-deltacps2E-4E; the capacity of the strains producing extracellular polysaccharide is determined through a phenol-sulfuric acid method, it is found that the capacity of knocking out extracellular polysaccharide produced by the strains is lower than that of wild type strains, and the double knockout strain extracellular polysaccharide yield is very low, so that the cps2E and cps4E genes play a key role in the extracellular polysaccharide synthesis, and the application has great potential in extracellular polysaccharide biosynthesis research and application fields.

The invention relates to a method of producing menaquinone-7, characterized in that cells of an E. coli strain comprising the B. subtilis DSM 1088 hepS gene, the B. subtilis DSM 1088 hepT gene and the putative B. subtilis DSM 1088 heptaprenyl transferase gene are fermented in a fermentation medium, with menaquinone-7 being accumulated in the cells of the fermented E. coli strain.

The present invention provides genes that encode the N-acetyl-(R,S)-β-amino acid acylases. The N-acetyl-(R,S)-β-amino acid acylases were isolated and purified from bacterial cells and the nucleotide sequences were determined. A host, such as Escherichia coli, was used to construct a high-expression system for these genes. The N-acetyl-(R)-β-amino acid acylase produced by Burkholderia sp. AJ110349 (FERM BP-10366) includes, for example, the protein having the amino acid sequence shown in SEQ. ID. NO. 8. The gene encoding this enzyme includes, for example, the DNA having the nucleotide sequence as shown in SEQ. ID. NO. 7. The N-acetyl-(S)-β-amino acid acylase produced by Burkholderia sp. AJ110349 (FERM BP-10366) includes, for example, the protein having the amino acid sequence shown in SEQ. ID. NO. 10. The gene encoding this enzyme includes, for example, the DNA having the nucleotide sequence shown inshown in SEQ. ID. NO. 9. The N-acetyl-(R)-β-amino acid acylase produced by Variovorax sp. AJ110348 (FERM BP-10367) includes, for example, the protein comprised of the amino acid sequence shown in SEQ. ID. NO. 12. The gene encoding this enzyme includes, for example, the DNA having the nucleotide sequence shown inshown in SEQ. ID. NO. 11.

The invention discloses a prodenia litura gene engineering virus No.3 and a building method thereof, in particular relates to a prodenia litura gene engineering virus used for carrying out deficiency and recombination on a wild type virus (SpltMNPV II) by utilizing a gene engineering method. The genome of the virus is deficient in an egt gene, namely an ecdysteroid UDP (uridine diphosphate) glucosyltransferase gene; and at the site of the deficient egt gene, a BmKITa1 gene controlled by a wild type virus, namely an early gene-1(ie-1) starter, and a marker gene, namely an enhanced green fluorescent protein (egfp) gene, which is controlled by the wild type virus, namely a polyhedron gene (ph) starterare inserted. The prodenia litura gene engineering virus No.3 disclosed by the invention has the advantages of faster insecticidal speed, less dosage effect and better field application effect compared with the wild type virus. Compared with the prior art, the prodenia litura gene engineering virus No.3 provided by the invention has less dosage effect and lower LT50 at low dose (105 polyhydral bodies/larva).