(+)-Ascosalitoxin and Vermelhotin, a Calmodulin Inhibitor, from an Endophytic Fungus Isolated from <i>Hintonia latiflora</i>
作者:Martha Leyte-Lugo、Martín González-Andrade、María del Carmen González、Anthony E. Glenn、Carlos M. Cerda-García-Rojas、Rachel Mata
DOI:10.1021/np300327y
日期:2012.9.28
derivative, namely, 9S,11R-(+)-ascosalitoxin (2). The structure and absolute configuration of the new compound were established through extensive NMR spectroscopy and molecular modeling calculations at the DFT B3LYP/DGDZVP level, which included the comparison between theoretical and experimental optical rotation values. In addition, chemical transformations of 2 yielded suitable derivatives for NOESY and
从药用植物Hintonia latiflora分离出的内生MEXU 26343的化学研究产生了已知的聚酮化合物vermelhotin(1)和一种新的水杨醛衍生物,即9 S,11 R -(+)-ascosalitoxin(2)。通过在FT B3LYP / DGDZVP水平上进行的广泛NMR光谱和分子建模计算,确定了该新化合物的结构和绝对构型,其中包括理论旋光值和实验旋光值之间的比较。此外,2的化学转化产生了适用于NOESY和1 H– 1的衍生物1 H NMR偶合常数分析,增强了立体化学分配。使用荧光生物传感器h CaM M124C- mBBr测量1和2与(Ca 2+)4 - h CaM在溶液中的潜在亲和力。结果表明,1与蛋白质结合的解离常数(K d)为0.25±0.04μM,接近于经典的CaM抑制剂氯丙嗪的解离常数(K d = 0.64±0.03μM)。1与(Ca 2+)4 - h的化学计量