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• W3014186811 abstract "Epimedin C, a major flavonoid extracted from Herba Epimedii, is a precursor of minor flavonoid icaritin that is a desired drug candidate with remarkable anti-cancer activities. For enhancing the biotransformation efficiency of icaritin, a novel α-l-rhamnosidase gene was cloned from hyperthermophiles Thermotoga petrophila DSM 13995. TpeRha displayed optimal activity at a pH of 4.5 and a temperature of 90 °C. The Km and Kcat of TpeRha for p-nitrophenyl-α-l-rhamnopyranoside were 2.99 mM and 651.73 s−1, respectively. It displayed broad catalytic ability in cleavage of the outer and inner rhamnopyranosyl moieties on the C-3 carbon of epimedin C. Further, this enzyme was utilized to improve the efficiency of the co-conversion system in transforming epimedin C into icaritin, in combined with a thermostable β-glucosidase Tpebgl1. In addition, a transformation pathway (epimedin C -icariin - icariside I - icaritin) with a high efficiency for icaritin production was screened. After a two-stage transformation under optimized conditions (90 °C, pH 4.5, 80 U/mL of TpeRha and 1.2 U/mL of Tpebgl1), 1 g/L of epimedin C was transformed into 0.4337 g/L of icaritin within 150 min, with a corresponding molar conversion rate of 96.9 %. This is the first report of enzymatic transformation on preparing icaritin from epimedin C by using thermostable glycosidase." @default.
• W3014186811 created "2020-04-10" @default.
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• W3014186811 date "2020-06-01" @default.
• W3014186811 modified "2023-10-15" @default.
• W3014186811 title "Biochemical characterization of a novel hyperthermophilic α-l-rhamnosidase from Thermotoga petrophila and its application in production of icaritin from epimedin C with a thermostable β-glucosidase" @default.
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• W3014186811 doi "https://doi.org/10.1016/j.procbio.2020.03.019" @default.
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