2.1.2.13 | synthesis |
engineering of Escherichia coli to ynthesize the plant-specific flavonoid O-pentosides quercetin 3-O-xyloside and quercetin 3-O-arabinoside. For UDP-xylose biosynthesis, genes UXS (UDP-xylose synthase) from Arabidopsis thaliana and ugd (UDP-glucose dehydrogenase) from E.scherichia coli, are overexpressed. The gene encoding ArnA, which competes with UXS for UDP-glucuronic acid, is deleted. For UDP-arabinose biosynthesis, UXE (UDP-xylose epimerase) i overexpressed. UDP-dependent glycosyltransferases are engineered to ensure specificity for UDP-xylose and UDP-arabinose. The srains thus obtained synthesize approximately 160 mg/liter of quercetin 3-O-xyloside and quercetin 3-O-arabinoside |
739902 |