Tetra-aryl cyclobutane and stilbenes from the rhizomes of Rheum undulatum and their α-glucosidase inhibitory activity: Biological evaluation, kinetic analysis, and molecular docking simulation
作者:Manh Tuan Ha、Minji Kim、Chung Sub Kim、Se-Eun Park、Jeong Ah Kim、Mi Hee Woo、Jae Sue Choi、Byung Sun Min
DOI:10.1016/j.bmcl.2020.127049
日期:2020.4
tetra-aryl cyclobutane [rheundulin A (1)] and three stilbene glycosides [rheundulins B-D (2-4)] were isolated from the methanol extract of Rheum undulatum L., along with eight known compounds (5-12). Structural determination of the new compounds (1-4) was accomplished using comprehensive spectroscopic methods. Compound 1 represents the first example of a dimeric stilbene linked via a cyclobutane ring from
从大黄大黄的甲醇提取物中分离出一种非手性四芳基环丁烷[rheundulin A(1)]和三个1,2-二苯乙烯苷[rheundulins BD(2-4)],以及八种已知化合物(5-12)。使用全面的光谱学方法完成了新化合物(1-4)的结构测定。化合物1代表通过大黄属的经由环丁烷环连接的二聚二苯乙烯的第一个实例。筛选所有分离物对α-葡萄糖苷酶的抑制作用。其中,二苯乙烯衍生物(5和6)对α-葡萄糖苷酶表现出强烈的抑制作用,IC50值分别为0.5和15.4 µM,显着高于阳性对照阿卡波糖(IC50 = 126.8 µM)。重组蛋白A(1)表现出中等程度的α-葡萄糖苷酶抑制作用,IC50值为80.1 µM。此外,首次进行了活性最高的化合物(5)与α-葡萄糖苷酶的动力学分析和分子对接模拟。动力学研究表明,化合物5竞争性抑制α-葡萄糖苷酶的活性位点(Ki = 0.40 µM),而化合物6对α-葡萄糖苷酶具有混合型抑制作用(Ki