11 results about "Elongase" patented technology

The application belongs to the technical field of biology, and discloses a Yarrowia lipolytica engineering strain for efficiently producing eicosapentaenoic acid based on citric acid metabolism regulation, a method and application, wherein a chassis strain of the engineering strain is Yarrowia lipolytica Po1f, and genes of Δ9 elongase, Δ8 desaturase, Δ5 desaturase and Δ17 desaturase in a fatty acid synthesis pathway, a heterologous ATP-citrate lyase and a mitochondrial citrate carrier are overexpressed. ATP-citrate lyases and mitochondrial citrate carrier genes respectively derived from Schizochytrium sp. and Saccharomyces cerevisiae are combined to be expressed in the Yarrowia lipolytica engineering strain, so that the production of EPA and oil in the Yarrowia lipolytica engineering strain is significantly improved, and compared with a control strain, the production of oil and EPA is respectively increased by 243.35% and 161.85%.

The invention provides a carbon chain elongase as well as a coding gene and application thereof, the amino acid sequence of the carbon chain elongase is as shown in a sequence table SEQ ID NO.1, the nucleotide sequence of the gene for coding the carbon chain elongase is as shown in a sequence table SEQ ID NO.2, and the carbon chain elongase can be used as a formaldehyde lyase and has a function of efficiently catalyzing formaldehyde to synthesize 1, 3-dihydroxyacetone.

This invention discloses an O-methyltransferase gene ElCOMT33 derived from *Euphorbia lathyris* and its applications. The nucleotide sequence of this gene is shown in SEQ ID NO:1, and the encoded protein sequence is shown in SEQ ID NO:2. The protein encoded by this gene catalyzes the sequential methylation of esculetin to generate scoparone, a coumarin phytoprotective agent with disease-resistant activity. Experiments have confirmed that overexpression of ElCOMT33 in the hairy roots of *Euphorbia lathyris* significantly increases the content of scoparetin and scoparone. This invention also provides a recombinant expression vector (such as pBinPlus-GFP4) containing this gene and host cells. The ElCOMT33 gene and related materials can be used to improve the scoparone synthesis capacity in medicinal plants (such as *Euphorbia lathyris*), enhance plant disease resistance, and provide new gene resources and technical means for molecular breeding of medicinal plants.

This invention provides a genetically engineered *Yersinia lipolytica* strain and its applications. The genetically engineered strain is a *Yersinia lipolytica* Po1f strain with the PEX10 gene knocked out, expressing the C16 / 18 elongase gene MaELO3 from *Morchella alpina*, the elongase gene AtKCS from *Arabidopsis thaliana*, and the elongase gene CraKCS from *Brassica oleracea*. The strain also expresses the elongase gene CgKCS from *Capsella*. Further expression of the desaturase gene MaD15D from *Morchella alpina*, and overexpression of the strain's own diacylglycerol transferase gene DGA1 and its own Δ9 desaturase gene OLE1, resulted in a nervonic acid yield of 111.6 mg / L in shake-flask fermentation. By adding 1% rapeseed oil exogenously, the nervonic acid yield reached 185.1 mg / L. The *Yersinia lipolytica* genetically engineered strain constructed in this invention is simple to operate, has stable and reliable performance, and can be applied to large-scale commercial production.

The invention relates to the technical field of synthesizing a sex pheromone component precursor substance by a biological method, further relates to a method for synthesizing a moth insect sex pheromone intermediate, and particularly relates to a recombinant plasmid containing cnaphalocrocis medinalis desaturase and elongase, a recombinant cell, an expression system and a construction method and application thereof. By adopting the method provided by the invention, the sex pheromone component precursor substance can be obtained through a non-chemical synthesis method for the first time, and when the sex pheromone component precursor substance is synthesized, the method is high in specificity, free of impurities or almost free of byproducts, and environment-friendly.

The present disclosure provides a kit and its application, the kit comprising two sets of amplification primer groups, single base extension primers and processing reagents; the amplification primer groups are used for amplifying Mycobacterium tuberculosis flora identification sites and anti-tuberculosis drug pharmacogenetic polymorphism sites; each pair of primers corresponds to the upstream and downstream regions of a SNP site; the processing reagents include PCR reaction mixture, PCR enzyme mixture, SAP reaction mixture, SAP enzyme mixture, extension reaction mixture and extension enzyme mixture. By designing specific amplification primer groups and single base extension primers, the system and reagents are optimized, and the sensitivity is high. The kit combined with matrix-assisted laser desorption ionization time-of-flight mass spectrometry can complete the detection of all sites, and the detection cost is low and the efficiency is high.

The invention provides a carbon chain elongase as well as a coding gene and application thereof, the amino acid sequence of the carbon chain elongase is as shown in a sequence table SEQ ID NO.1, the nucleotide sequence of the gene for coding the carbon chain elongase is as shown in a sequence table SEQ ID NO.2, and the carbon chain elongase can be used as a formaldehyde lyase and has a function of efficiently catalyzing formaldehyde to synthesize 1, 3-dihydroxyacetone.

The invention discloses a method for increasing the yield of stearic acid in schizochytrium limacinum based on lipid droplet targeting and application, and belongs to the technical field of microbial metabolism engineering. The invention aims to solve the technical problems of non-specific positioning of single lipid droplet protein signal peptide and difficulty in efficiently producing stearic acid in schizochytrium limacinum. The invention provides a fusion protein containing a lipid droplet targeting signal peptide and palmitic acid elongase, wherein the amino acid sequence of the lipid droplet targeting signal peptide is shown as SEQ ID NO: 5, and the lipid droplet targeting signal peptide is connected to the N-terminal of the palmitic acid elongase. The fusion protein is expressed in a schizochytrium limacinum genetic engineering strain and is subjected to fermentation culture, so that the yield of stearic acid is effectively increased. The fusion protein and the method are mainly used for improving the stearic acid yield of schizochytrium limacinum, can be used for plant subcellular localization research, provide a favorable method for subcellular localization research of microalgae such as schizochytrium limacinum and have important significance.

A method for producing a microbial oil includes genetically modifying a labyrinthulid which belongs to the genus Parietichytrium or the genus Schizochytrium by disrupting and / or silencing a Δ4 desaturase gene, a C20 elongase gene, and / or a C18 elongase gene, or by being transformed with an ω3 desaturase gene; culturing the labyrinthulid; and collecting the microbial oil from the labyrinthulid. The labyrinthulid has an activity of synthesizing DHA via a PUFA-PKS pathway in an amount of not more than 1 / 100 of a total amount of DHA synthesized in the labyrinthulid or no activity of producing PUFAs via the PUFA-PKS pathway, and the labyrinthulid has an activity of producing PUFAs via an endogenous elongase-desaturase pathway.

The application belongs to the technical field of biology, and discloses an exogenous cofactor enhanced Yarrowia lipolytica strain, a method and application in high-efficiency synthesis of EPA and lipids. The chassis strain of the Yarrowia lipolytica strain is Yarrowia lipolytica Po1f, and part of elongated desaturase in a fatty acid synthesis pathway, mainly including Δ9 elongase, Δ8 desaturase, Δ5 desaturase and Δ17 desaturase genes, is overexpressed in the strain. On this basis, G6PDH and malic enzyme are simultaneously overexpressed. The strain improves the EPA and lipid yield of Yarrowia lipolytica. The application is suitable for constructing a gene engineering strain with high EPA and lipid yield, and provides a basis for Yarrowia lipolytica to produce EPA-rich oil, so as to solve the problems of unsustainability and high cost caused by obtaining EPA from fish.

This invention belongs to the fields of genetic engineering and fermentation engineering, and discloses a method for constructing and applying a Schizochytrium strain that produces high DHA content. The engineered Schizochytrium strain uses Schizochytrium sp. HX308 as the starting strain. Through metabolic engineering, a complete elongation-desaturation pathway is established in Schizochytrium (overexpression of C16 / 18 elongase, Δ-9 elongase gene, Δ-5 desaturase gene, Δ-17 desaturase gene, Δ-5 elongase gene, and Δ-4 desaturase gene), which works synergistically with the PKS pathway to produce DHA. The peroxisome synthesis factor PEX10 is knocked out to obtain the recombinant engineered strain SCD3. In fed-batch fermentation, the final DHA content of the engineered Schizochytrium strain SCD3 is the highest to date, reaching 70.1% of the total fatty acid content. The oil and DHA yields are also significantly increased, reaching 67.9 g / L and 47.6 g / L, respectively. The DHA yield is 1.7 times that of the wild type. This engineered strain has good application prospects.