Conformationally Restricted Analogs of 1α,25-Dihydroxyvitamin D<sub>3</sub> and Its 20-Epimer: Compounds for Study of the Three-Dimensional Structure of Vitamin D Responsible for Binding to the Receptor
作者:Keiko Yamamoto、Wei Yan Sun、Masateru Ohta、Kazuhiro Hamada、Hector F. DeLuca、Sachiko Yamada
DOI:10.1021/jm9600048
日期:1996.1.1
play important roles in the expression of vitamin D function: the specific nuclear receptor protein (vitamin D receptor, VDR) and the transport protein (vitamin D binding protein, DBP). This study was conducted to clarify the conformation of vitamin D responsible for binding to those proteins. For the purpose, the side chain mobility of 1,25(OH)2D3 (1) and its 20-epimer, 20-epi-1,25(OH)2D3 (2), was analyzed
两种蛋白在维生素D功能的表达中起着重要作用:特异性核受体蛋白(维生素D受体,VDR)和转运蛋白(维生素D结合蛋白,DBP)。进行该研究以阐明负责与那些蛋白质结合的维生素D的构象。为此,通过系统构象搜索分析了1,25(OH)2D3(1)及其20-受体,20-epi-1,25(OH)2D3(2)的侧链迁移率。结果以三维点图的形式描绘,这表明两种维生素(1和2)的侧链占据了在两个区域中分开的不同空间区域。我们将这些区域表示为1的A和G,以及2的EA和EG。四个类似物,即22-甲基化1,25(OH)2D3的C(20)和C(22)(3-6)处的非对映异构体链条仅限于占据G,A,EA和EG,分别进行了设计。通过将有机铜的立体选择性共轭加成到甾族E-和Z-22-en-24-one中作为关键步骤,可以有效地合成这些类似物(3-6)。与VDR结合时,类似物(3-6)相对于1,25-(OH)2 D 3(1)的亲和力分别为1