81 results about "Yeast gene" patented technology

The present invention is directed to a process of producing novel fatty acids in oleaginous yeast by producing oleaginous yeast by introducing into the yeast genes coding for enzymes selected from the group consisting of D5-desaturase, D6-desaturase, D12-desaturase, D15-desaturase and elongase; and culturing the yeast in the medium containing high levels of carbon sources. The present invention is further directed to a residue or fatty acid that is obtained from pressing the oleaginous yeast produced by the process of the invention.

The invention provides a modified coding gene of xylanase that has high activity in the condition of high temperature and strong alkali, a recombinant plasmid thereof, a yeast recombination genetic engineering strain containing the gene and a preparation method of the gene. Compared with the original xylanase, the modified xylanase is mutated into cysteine from glycin of the 201 site of amino acid sequence of the original xylanase; and the modified xylanase has higher heat stability, after being processed for 10 minutes at the temperature of 75 DEG C, the residual activity of the modified xylanase reaches 80 percent, while that of the original xylanase is only 15 percent. The activity of the modified xylanase is 1.5 to 2 times of that of the original xylanase at the environment with high temperature and strong alkali and can decompose xylan for a long time at high temperature. The invention also provides the Pichia pastoris yeast recombination genetic engineering strain containing the modified gene. The modified xylanase can be widely applied to industries of paper making, feedstuff and food.

The invention provides a universal yeast donor strain that contains a conditional centromere and a URA3 allele on every chromosome. This strain was constructed in four rounds of crosses of individual conditional chromosome strains using a novel tetrad-based screen to identify segregants in which all marked chromosomes were contained in the same spore. The invention also provides an improved high efficiency method to transfer extrachromosomal genetic material such as plasmid DNA into any Saccharomyces strain for use with the current gene disruption libraries. The method of transfer is mating-based method which uses a kar1 plasmid donor strain that can initiate mating but cannot form a diploid and allows plasmid transfer (plasmoduction) between nuclei in the heterokaryon. kar1 matings have been used to transfer YACs between yeast strains, but previous methods required specialized genetic backgrounds in the recipient strains and suffered from high rates of spurious chromosome transfer (Hugerat, Y., et al. 1994. Genomics 22:108). Plasmoduction with the universal donor strain only requires that the recipient strain be ura3, GAL+ and have another marker available for selection of the transferred plasmid. Counterselection against every donor chromosome also limits the amount of spurious allele transfer. The universal donor strain and the method of the invention are used to screen the yeast gene disruption library with plasmid-based dominant negative alleles of various genes.

A genetically engineered yeast Pichia pastoris (GS115/HBMO47) able to effectively express beta-mannase is prepared through screening beta-mannase gene from the environmental microbes, cloning it to the expression carrier of Pichia yeast, introducing the carrier to Pichia yeast, and screening. The process for preparing the high-activity beta-mannase and the high-purity oligomannosan from said Pichia pastoris is also disclosed.

The present invention relates to a yeast gene engineering strain capable of expressing hrp gene and its construction method. The name of said strain is Saccharomyces cerevisiae hrp Z, its number is CCTCC No:M203004. Its construction method includes: extraction of pseudomonas syringae genome DNA; using genome DNA as template PCR primer to make construction of hrp Z recombinant yeast gene engineering strain; hrpZ gene contained yeast conversion and induction. The gene engineering harpin protein produced by said strain can induce plant hypersensitive reaction, activate internal self-defense function of plant and promote plant growth. so that it can raise yield and quality of crops.

The invention discloses an amino acid sequence of beta-mannase gene and coding making method in the biological domain, which is characterized by the following: extracting Armillariella tabescens main RNA of high activity by konjaku flour evoking; using consanguinity sequence of Genebank to design degenerate primer; carrying on PCR expanding to protectorate by primer; designing gene specificity primer to carry on 3'RACE and 5'RACE; cloning total long cDNA of beta-mannase gene; constructing eucaryon expressing carrier with pichia; building-up yeast gene engineering bacterial strain.

A genetically engineered yeast GS115/HB705 able to effectively express the high temp and alkali resistant xylanase is disclosed, which can be used to prepare said xylanase through culture, separation and purifying, and in turn the oligoxylose.

The invention discloses beta-mannase, a coding gene as well as a producing strain and application thereof. The fungus of the high-temperature beta-mannase is Aspergillus sp.T16 with a preservation number of CCTCC NO: M2013122. The novel high-temperature mannase gene manT16 obtained by cloning the fungus has a nucleotide sequence as shown in SEQ ID NO.2 or 3. The beta-mannase obtained by coding has an amino acid sequence as shown in SEQ ID NO.1, as well as a recombinant vector for coding the mannase gene and yeast genetically engineered bacterium. The mannase has an optimum temperature of 75 DEG C and an optimum pH value of 3.5-5.0, and is tolerable to the high temperature of 75 DEG C and stable under the pH value of 2.2-8.0. Moreover, as novel high temperature enzyme, the beta-mannase has a great production application value and extensive application prospect in industries of feed, food, medicines, wine brewing, energy and the like.

The present invention provides a yeast gene engineering bacterium Pichia pastoris GS115/HY005 which is an endo inulase gene obtain by screening strain from Aspergillus by means of PCR method or DNA library hybridization method. It can be cloned and inserted into Pichia yeast integration expression vector, then the obtained expression vector containing endoinulase gene is introduced into Pichia yeast, then a yeast gene engineering bacterium capable of high-effectively expressing endoinulase can be screened. The enzyme activity of the endoinulase prepared with said yeast gene engineering bacterium can be up to above 300 u/ml, and the reaction time for hydrolyze inulin with it is short, and its conversion rate is high, so that it can high-effectively economically convert and prepare oligofructose.

The invention relates to a novel adenovirus vector and a production method for the same. The production method comprises two main steps of: 1, cloning exogenous genes in shuttle vectors; and 2, recombining the shuttle vectors with adenovirus framework vectors. According to the novel adenovirus vector and the production method disclosed by the invention, the shuttle vectors used are -pCMV-FH improved on the basis of pShuttle-CMV carriers; the adenovirus framework vectors are formed by cloning a yeast gene for expressing ISceI in the existing adenovirus framework vectors; and a recombination strain used is SW102. Both of the method for cloning the shuttle vectors, and the method for recombining the shuttle vectors with the adenovirus framework vectors disclosed by the invention adopt high-flux production methods, and 99% of shuttle vectors can be recombined in the adenovirus framework vectors by repeatedly operating the high-flux method for cloning the shuttle vectors and the high-flux method for recombining to the fifth round. The recombining efficiency of the high-flux method for producing the adenovirus framework vectors is up to 85-90%, the experimental steps are greatly simplified, the time is greatly shortened, and the experimental cost is obviously decreased.

The present invention relates to a gene associated with ethanol tolerance, and yeast strains and uses using the same. The yeast strain of this invention may growth under the condition not only with high-concentration ethanol, preferably 6-15% ethanol, but also in high osmotic pressure, preferably 30-40% glucose or sucrose. The present inventors developed yeast strains resistant to high-concentration glucose and ethanol, suggesting that they would be valuably applied to much effective ethanol production, and also be utilized as a superbacteria having tolerance to various stresses for ethanol production with high efficiency.

The invention discloses a phaffia rhodozyma strain obtained by efficiently an over-expressing endogenous astaxanthin synthetase gene. The invention provides a phaffia rhodozyma genetic engineering strain capable of producing astaxanthin with high yield, obtained by over-expressing an endogenous astaxanthin synthetase gene. A phaffia rhodozyma genetic engineering strain (MK19-pGBKT7crtS) capable of producing astaxanthin with high yield is obtained by over-expressing the astaxanthin synthetase gene crtS by virtue of free plasmids and the strain is named CSR19. An endogenous ribosome bind site sequence (Rbs. sequence for short) exists in front of the crtS gene expressed by the strain. By virtue of fermentation cultivation and in comparison with a receptor strain MK19, the astaxanthin yield of the engineering strain is increased by 33.5%, and the engineering strain is good in stability, and thus, the phaffia rhodozyma strain has a good application prospect in the feed industry.

The present invention discloses a methanol yeast gene engineering bacterium strain SIBAS 0111 originated from high-effective expression D-amino acid oxidase, its D-amino acids oxidase gene is originated from trigonopsis vriabllis. Said inventions is characterized by that it utilizes the construction, transformation and screening of recombinant expression plasmid pPIC 3.5K-DAAO to obtain recombinant gene engineering bacterium strain of high-yield D-amino acid oxidase. After fermentation expression the expression level of D-miano acid oxidase in fermentation liquor can be upto 23000 U/L.

The invention pertains to the biological gene engineering technical field, in particular to a yeast gene engineering system of expressing enzyme which comprises the construction of an expression box which consists of Bengal grain kluyveromyces promoter, terminator and inulase gene with signal peptide, the construction of high-stable inulase gene expression plasmid by inserting the expression box into a carrier pUKD-S, the construction of gene engineering bacteria of expressing inulase with high efficiency by importing Bengal grain kluyveromyces host Y179ura3^- and the production of inulase by using the constructed Bengal grain kluyveromyces gene engineering bacteria. The invention could also be used for expressing and producing other endogenetic, exogenous, natural and recombinant enzymes.

Fusarium graminearum is a plant pathogen, attacking a wide range of plant species including corn (ear and stalk rot), barley, and wheat (head blight). Fusarium epidemics result in millions of dollars of losses in crop revenues. Fusarium graminearum infection in the cereals reduces both grain yield and quality. Mycotoxins are produced by many fungal Fusarium species and thus the grain becomes contaminated with these mycotoxins, such as the trichothecenes. The major trichothecene produced by F. graminearum is deoxynivalenol (abbreviated as DON, also known as vomitoxin). Trichothecenes are potent protein synthesis inhibitors and are quite toxic to humans and livestock. A yeast gene has been identified which confers upon yeast tolerant of the trichothecene, trichodermin. A corresponding plant gene has been prepared, which has been used to transform plants. These transformed plants have an increased resistance to Fusarium infestation.

The invention relates to overexpressed phosphorylcholine cytidine transferase saccharomyces cerevisia genetically engineered bacteria as well as a construction method and application thereof. The construction method comprises the steps of cloning saccharomyces cerevisia sourced gene cct capable of encoding phosphorylcholine cytidine transferase to a pYES2.0-Kanmx carrier so as to construct recombinant plasmid pYES2.0-Kanmx-cct, and transferring the recombinant plasmid pYES2.0-Kanmx-cct into S.cerevisiae HG, so as to obtain the saccharomyces cerevisia genetically engineered bacteria. The yield of a solid matter of the strain to fermentable sugar is 50%-56%, the strain can be used for manufacturing a citicoline product from 5'-cytidine monophosphate and phosphorylcholine through bioconversion, and after the strain reacts for 7 hours, the molar conversion ratio reaches up to 73%. The yield of the strain in a fermentation system for producing and culturing the strain is high. When applied to the production of citicoline, the strain has the advantages of low cost and manufacturing energy consumption, short reaction period and the like.