A regiospecific rhamnosyltransferase from <i>Epimedium pseudowushanense</i> catalyzes the 3-<i>O</i>-rhamnosylation of prenylflavonols
作者:Keping Feng、Ridao Chen、Kebo Xie、Dawei Chen、Baolin Guo、Xiao Liu、Jimei Liu、Min Zhang、Jungui Dai
DOI:10.1039/c7ob02763j
日期:——
8-prenylkaempferol (1) and anhydroicaritin (2) at the 3-OH position to form baohuoside II (1a) and baohuoside I (2a) in vitro. In addition, a UDP-rhamnose synthase gene, EpRhS, from E. pseudowushanense was functionally characterized and used to produce the UDP-rhamnose sugar donor. Furthermore, an engineered Escherichia coli strain containing EpPF3RT and EpRhS was established to produce baohuoside II (1a) from whole
淫羊med在传统中药中使用,并含有具有多种生物活性的黄酮醇苷。这些生物活性黄酮醇糖苷通常在异戊烯基黄酮醇的3-OH位置具有鼠李糖部分,如icariin (9),baohuoside I(1a)和baohuoside II(2a)。然而,迄今为止,尚未报道鼠李糖基转移酶催化异戊烯基黄酮醇的3- O-鼠李糖基化。在本文中,从伪乌山大肠杆菌BL Guo中鉴定出黄酮醇鼠李糖基转移酶EpPF3RT。重组酶将鼠李糖部分区域特异性地转移至8-异戊二烯基山emp酚(1)和脱水脱水甘油(2))在3-OH的位置在体外形成baohuoside II(1a)和baohuoside I(2a)。另外,功能上表征了来自假乌山大肠杆菌的UDP-鼠李糖合酶基因EpRhS,并用于生产UDP-鼠李糖供体。此外,建立了包含EpPF3RT和EpRhS的工程化大肠杆菌菌株,以从全细胞中产生宝火苷II(1a)。这些研究表明酶的方法在