摘要:
Disclosed are methods and compositions for increasing the triacylglycerol content of a cell by increasing the activity of a type 1 diacylglycerol acyltransferase (i.e., DGA2) and increasing the activity of a type 2 diacylglycerol acyltransferase (i.e., DGA1). In some embodiments, the triacylglycerol content of a cell is also modified by decreasing the activity of a triacylglycerol lipase in the same cell. Also disclosed are methods and compositions for increasing the triacylglycerol content of a cell by increasing the activity of a type 1 diacylglycerol acyltransferase (i.e., DGA2), or by increasing the activity of a type 3 diacylglycerol acyltransferase (i.e., DGA3).
摘要:
Disclosed are transformed cells and related nucleotide and protein sequences, and fermentation compositions and methods, all of which are related to providing selective advantage in fermentation. For example, a selective advantage results from transformation of a cell with a nucleic acid that allows a transformed cell to metabolize one or more nitrogen-, phosphorous-, and/or sulfur-containing compounds that a native cell of the same species as the transformed cell cannot metabolize, and from fermentation of the transformed cell using one or more feedstocks, such as fractioned grain, which are depleted in or free of conventional nitrogen-, phosphorous-, and/or sulfur-containing compounds that a native cell of the same species as the transformed cell can metabolize. Also disclosed are methods for improved oxygen transfer in an aerobic or microaerobic fermentation.
摘要:
Disclosed are nucleotide sequences and corresponding amino acid sequences of Arxula adeninivorans genes that can be utilized to manipulate the lipid content and/or composition of a cell. Methods and compositions for utilizing this information are disclosed to increase the lipid content or modify the lipid composition of a cell by either increasing or decreasing the activity of certain genetic targets.
摘要:
Disclosed are methods and compositions for increasing the triacylglycerol content of a cell by up-regulating diacylglycerol acyltransferase and down-regulating triacylglycerol lipase. In some embodiments, a DGA1 protein is expressed and a native TGL3 gene is knocked out, thereby increasing the synthesis of triacylglycerol and decreasing its consumption, respectively.
摘要:
Disclosed are the nucleotide sequences of promoters from Arxula adeninivorans and Yarrowia lipolytica which may be used to drive gene expression in a cell. The promoters were validated, and selected promoters were screened to determine which promoters may be useful for increasing the lipid production efficiency of oleaginous yeasts.
摘要:
Disclosed are genetically engineered organisms, such as yeast and bacteria, that have the ability to metabolize atypical phosphorus or sulfur sources. Fermentation methods using the genetically engineered organisms are also described. The fermentation methods are robust processes for the industrial bioproduction of a variety of compounds, including commodities, fine chemicals, and pharmaceuticals.
摘要:
Disclosed are methods and compositions for reducing horizontal gene transfer of functional proteins. In some embodiments, the risk of horizontal gene transfer of a functional protein is reduced by separately encoding domains of a protein on at least two spatially distinct nucleic acid sequences, where each individual domain alone is non-functional, but co-expression of the encoded domains results in their association to form a functional protein.
摘要:
Disclosed are compositions for drilling and/or maintaining a wellbore, e.g., drilling fluids and drilling muds, comprising oleaginous yeast. The oleaginous yeast may comprise at least about 45 wt% oil. The oleaginous yeast may comprise a genetic modification that either increases the oil content of the yeast, alters the lipid composition of the yeast, and/or provides a selective advantage for the yeast, e.g., relative to an unmodified yeast of the same species.