Metabolic study of bioethanol production by the genetically engineered fungus Fusarium oxysporum
Abstract
Ethanol produced from lignocellulose is an environment-friendly alternative to fossil fuels. The filamentous fungus Fusarium oxysporum is known for its ability to ferment hexoses and pentoses directly to ethanol. During xylose fermentation an accumulation of sedoheptulose-7-phosphate was observed, which might indicate a limitation in the transaldolase reaction or a competition of glyceraldehyde-3-phosphate between pentose phosphate pathway and glycolysis, resulting in acetate production and reduced xylose consumption. Moreover, accumulation of glucose-1,6-diphosphate may indicate reduced activity of phosphoglucomutase, which is involved in the conversion of glucose-6-phosphate to glucose-1-phosphate via glucose-1,6-diphosphate, and hence potential difficulties of glucose to be channelled towards cell wall biosynthesis. Purification and characterization of transaldolase and phosphoglucomutase was studied. In the case of transaldolase, LC-MS/MS analysis provided peptide mass and sequence ...
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