摘要:
The present invention relates to genetically modified yeasts that can use lactate as a carbon source to produce a fermentation product. In one aspect, the yeasts can consume glucose and lactate simultaneously to produce ethanol. In one aspect, the genetically modified yeast is transformed to include a monocarboxylic/monocarboxylate transporter. In one aspect, the yeast can include one or more heterologous genes encoding lactate dehydrogenase (cytochrome) (EC 1.1.2.3 and/or 1.1.2.4).
摘要:
A recombinant yeast cell having a decreased RGT1 protein activity and an increased ability to produce a glycolytic intermediate or a glycolytic intermediate-derived substance, compared to a parent cell; methods of producing the same; and methods of producing the glycolytic intermediate or the glycolytic intermediate-derived substance using the same.
摘要:
Provided is an acid-tolerant yeast cell, a method of producing an organic acid by using the yeast cell, and a method of producing the yeast cell resistant to acid.
摘要:
One aspect of the invention relates to a genetically modified thermophilic or mesophilic microorganism, wherein a first native gene is partially, substantially, or completely deleted, silenced, inactivated, or down-regulated, which first native gene encodes a first native enzyme involved in the metabolic production of an organic acid or a salt thereof, thereby increasing the native ability of said thermophilic or mesophilic microorganism to produce ethanol as a fermentation product. In certain embodiments, the aforementioned microorganism further comprises a first non-native gene, which first non-native gene encodes a first non-native enzyme involved in the metabolic production of ethanol. Another aspect of the invention relates to a process for converting lignocellulosic biomass to ethanol, comprising contacting lignocellulosic biomass with a genetically modified thermophilic or mesophilic microorganism.
摘要:
A recombinant flavocytochrome b2 (FCb2), comprising a mature FCb2 peptide sequence of a native FCb2, or a functionally active variant of said mature FCb2 peptide sequence, wherein the N-terminus of said mature FCb2 peptide sequence consists of a truncated signal peptide sequence replacing the native signal peptide sequence, and wherein said truncated signal peptide sequence is of the following structure from N- to C-terminus: i. a methionine; ii. optionally a tag sequence; iii. an amino acid sequence of a length of 0-9 amino acids of the native signal peptide sequence, corresponding to the amino acid sequence up to 9 amino acids directly upstream of the I/L/V-x-N/A/L motif of the native signal peptide sequence of FCb2; and iv. the I/L/V-x-N/A/L motif, which can be of number 0, 1, or can be partially truncated, wherein if the number is 0 or the I/L/V-x-N/A/L is partially truncated, the length of the amino acid sequence of iii. is 0, wherein the amino acid sequence of said recombinant FCb2 is different from SEQ ID NO: 145.
摘要:
Provided are a genetically engineered yeast cell having increased activity of SUL1, STR3, HXT7, ERR1, GRX8, MXR1, GRE1, MRK1, AAD10 or a combination thereof, compared to a parent cell, and also having acid tolerance, a method of preparing the same, and a method of producing lactate using the same.
摘要:
One aspect of the invention relates to a genetically modified thermophilic or mesophilic microorganism, wherein a first native gene is partially, substantially, or completely deleted, silenced, inactivated, or down-regulated, which first native gene encodes a first native enzyme involved in the metabolic production of an organic acid or a salt thereof, thereby increasing the native ability of said thermophilic or mesophilic microorganism to produce ethanol as a fermentation product. In certain embodiments, the aforementioned microorganism further comprises a first non-native gene, which first non-native gene encodes a first non-native enzyme involved in the metabolic production of ethanol. Another aspect of the invention relates to a process for converting lignocellulosic biomass to ethanol, comprising contacting lignocellulosic biomass with a genetically modified thermophilic or mesophilic microorganism.
摘要:
The present invention relates to a bacterial cell of the genus Pasteurella comprising a heterologous polypeptide having formate dehydrogenase activity. The present invention also relates to a method of manufacturing succinic acid and the use of the bacterial cell for the manufacture of succinic acid.
摘要:
One aspect of the invention relates to a genetically modified thermophilic or mesophilic microorganism, wherein a first native gene is partially, substantially, or completely deleted, silenced, inactivated, or down-regulated, which first native gene encodes a first native enzyme involved in the metabolic production of an organic acid or a salt thereof, thereby increasing the native ability of said thermophilic or mesophilic microorganism to produce ethanol as a fermentation product. In certain embodiments, the aforementioned microorganism further comprises a first non-native gene, which first non-native gene encodes a first non-native enzyme involved in the metabolic production of ethanol. Another aspect of the invention relates to a process for converting lignocellulosic biomass to ethanol, comprising contacting lignocellulosic biomass with a genetically modified thermophilic or mesophilic microorganism.
摘要:
Yeast cells having an exogenous lactate dehydrogenase gene ae modified by reducing L- or D-lactate:ferricytochrome c oxidoreductase activity in the cell. This leads to reduced consumption of lactate by the cell and can increase overall lactate yields in a fermentation process. Cells having the reduced L- or D-lactate:ferricytochrome c oxidoreductase activity can be screened for by resistance to organic acids such as lactic or glycolic acid.