摘要:
The present invention provides methods for the conditional or regulated expression of a site-specific recombinase using split intein-mediated protein splicing. This enhances the temporal and tissue-specificity of trait gene expression and allows for fine tuning of expression specificity.
摘要:
A nucleic acid fragment encoding a herbicide-resistant plant acetolactate synthase protein is disclosed. This nucleic acid fragment contains at least one nucleotide mutation resulting in one amino acid change in one of seven substantially conserved regions of acetolactate synthase amino acid homology. This mutation results in the production of an acetolactate synthase protein which is resistant to sulfonylurea herbicide compounds compared to the wild-type protein. Transformation of herbicide sensitive plants or plant cells with the fragment results in resistance to the herbicide.
摘要:
Methods for increasing C18 to C20 elongation conversion efficiency and/or Δ4 desaturation conversion efficiency in long-chain polyunsaturated fatty acid [“LC-PUFA”]-producing recombinant oleaginous microbial host cells are provided herein, based on over-expression of acyl-CoA:lysophospholipid acyltransferases [“LPLATs”] (e.g., Ale1, LPAAT, LPCAT). Production host cells and oils produced by the methods of the invention are also claimed.
摘要:
Transgenic soybean seed having increased total fatty acid content of at least 10% and altered fatty acid profiles when compared to the total fatty acid content of non-transgenic, null segregant soybean seed are described. DGAT genes from Yarrowia lipolytica are used to achieve the increase in seed storage lipids.
摘要:
Transgenic soybean seed having increased total fatty acid content of at least 10% and altered fatty acid profiles when compared to the total fatty acid content of non-transgenic, null segregant soybean seed are described. DGAT genes from Yarrowia Lipolytica are used to achieve the increase in seed storage lipids.
摘要:
Mutant delta-5 desaturases, having the ability to convert dihomo-gamma-linolenic acid [DGLA; 20:3 omega-6] to arachidonic acid [ARA; 20:4 omega-6] and/or eicosatetraenoic acid [ETA; 20:4 omega-3] to eicosapentaenoic acid [EPA; 20:5 omega-3] and possessing at least one mutation within the HPGG (SEQ ID NO:7) motif of the cytochome b5-like domain and at least one mutation within the HDASH (SEQ ID NO:8) motif are disclosed. Isolated nucleic acid fragments and recombinant constructs comprising such fragments encoding delta-5 desaturases, along with a method of making long chain polyunsaturated fatty acids [“PUFAs”], are also disclosed.
摘要翻译:具有将dihomo-γ-亚麻酸转化的能力的变体delta-5去饱和酶[DGLA; 20:3ω-6]花生四烯酸[ARA; 20:4ω-6]和/或二十碳四烯酸[ETA; 20:4ω-3]至二十碳五烯酸[EPA; 20:5ω-3],并且在细胞色素b5样结构域的HPGG(SEQ ID NO:7)基序和HDASH(SEQ ID NO:8)基序内的至少一个突变中具有至少一个突变。 还公开了分离的核酸片段和包含编码Δ-5去饱和酶的片段的重组构建物,以及制备长链多不饱和脂肪酸[“PUFA”]的方法。
摘要:
Engineered strains of the oleaginous yeast Yarrowia lipolytica capable of producing greater than 25% eicosapentaenoic acid (EPA, an ω-3 polyunsaturated fatty acid) in the total oil fraction are described. These strains comprise various chimeric genes expressing heterologous desaturases, elongases and acyltransferases and optionally comprise various native desaturase and acyltransferase knockouts to enable synthesis and high accumulation of EPA. Production host cells are claimed, as are methods for producing EPA within said host cells.
摘要:
Two acyltransferases are provided, suitable for use in the manufacture of microbial oils enriched in omega fatty acids in oleaginous yeast (e.g., Yarrowia lipolytica). Specifically, the genes encoding phophatidylcholine-diacylglycerol acyltransferase (PDAT) and diacylglycerol acyltransferase (DGAT2) have been isolated from Y. lipolytica. These genes encode enzymes that participate in the terminal step in oil biosynthesis in yeast. Each is expected to play a key role in altering the quantity of polyunsaturated fatty acids produced in oils of oleaginous yeasts.
摘要:
Described are engineered strains of the oleaginous yeast Yarrowia lipolytica capable of producing an oil comprising greater than 50 weight percent of eicosapentaenoic acid [“EPA”], an ω-3 polyunsaturated fatty acid, measured as a weight percent of total fatty acids [“% TFAs”] and having a ratio of at least 3.1 of EPA % TFAs, to linoleic acid, measured as % TFAs. These strains over-express at least one Δ9 elongase/Δ8 desaturase multizyme, in addition to other heterologous Δ9 elongases, Δ8 desaturases, Δ5 desaturases, Δ17 desaturases, Δ12 desaturases, C16/18 elongases, and optionally over-express diacylglycerol cholinephosphotransferases, malonyl CoA synthetases and/or acyl-CoA lysophospholipid acyltransferases. The expression of at least one peroxisome biogenesis factor protein is down-regulated. Methods for producing EPA within said host cells, oils obtained from the cells, and products therefrom are claimed.
摘要:
The present invention relates to Δ6 desaturases, which have the ability to convert linoleic acid [“LA”; 18:2 ω-6] to γ-linolenic acid [“GLA”; 18:3 ω-6] and/or α-linolenic acid [“ALA”; 18:3 ω-3] to stearidonic acid [“STA”; 18:4 ω-3]. Isolated nucleic acid fragments and recombinant constructs comprising such fragments encoding Δ6 desaturases, along with methods of making long-chain polyunsaturated fatty acids [“PUFAs”] using these Δ6 desaturases in oleaginous yeast, are disclosed.