An Efficient One‐Pot Enzymatic Synthesis of Cardiac Glycosides with Varied Sugar Chain Lengths
作者:Wei Huang、Chao Wen、Zhen‐Ru Zhou、Zhi‐Hao Fu、Adriana Katz、Alexander Plotnikov、Steven J. D. Karlish、Ren‐Wang Jiang
DOI:10.1002/adsc.201900227
日期:2019.7.2
An efficient one‐pot enzymatic synthesis of cardiacglycosides with varied sugar chain lengths (average yield >80%) was carried out through sequential glycosylation using a steroid glycosyltransferase UGT74AN3 from Catharanthus roseus and a cyclodextrin glycosyltransferase from Bacillus licheniformis. A series of cardiacglycosides were obtained and showed enhanced affinity and selectivity for inhibition
一种高效的一锅法酶促合成不同糖链长度的强心苷(平均收率> 80%),是通过使用玫瑰花(Catharanthus roseus)的甾体糖基转移酶UGT74AN3和地衣芽孢杆菌的环糊精糖基转移酶通过顺序糖基化进行的。获得了一系列强心苷,它们显示出更高的亲和力和选择性,可抑制Na + / K + -ATPase的α2亚型。这些发现表明,一锅法生物催化方法在合成多种强心苷作为潜在安全的强心剂方面具有巨大潜力。
Biotransformation of digitoxigenin by cultured ginseng cells
Nine compounds, including a new compound (digitoxigenin beta-D-glucoside malonyl ester), were isolated as biotransformation products of digitoxigenin by cell suspension cultures of Panax ginseng (Pg-3 cell line). At the same time, two known products were identified by TLC and HPLC.
Hybrid cells between Strophanthus gratus and S. amboensis were obtained by electrofusion and confirmed to be hybrids through isozyme and RFLP analyses. Because a new and hybrid compound, 17 beta H-periplogenin beta-D-glucoside, was isolated as a biotransformation product of digitoxigenin by the hybrid cells, isomerization of 17 beta-lactone ring on S. gratus and glucosylation on S. amboensis were demonstrated
通过电融合获得 Strophanthus gratus 和 S. amboensis 之间的杂种细胞,并通过同工酶和 RFLP 分析证实是杂种。由于杂种细胞分离出一种新的杂合化合物 17 β H-periplogenin β-D-葡萄糖苷作为洋地黄毒苷的生物转化产物,因此证明了 S. gratus 上 17 β-内酯环的异构化和 S. amboensis 上的糖基化同时作为杂交细胞中的生物转化能力。此外,通过提高蔗糖浓度提高了杂化化合物的生产率。