Probing the active site of aromatase with 2-methyl-substituted androstenedione analogs
作者:Mitsuteru Numazawa、Yoko Watari、Keiko Yamada、Nao Umemura、Wakako Handa
DOI:10.1016/s0039-128x(03)00089-8
日期:2003.8
2beta- and 2alpha-methylADs (5 and 6), 19-oxygenated derivatives of compounds 4 and 6, and 2-methyleneAD (17), and we then tested their inhibitory activity as well as their aromatase reaction (aromatization for 2-methyl and 2-methylene analogs or 19-oxygenation for 2,2-dimethyl steroids) with human placental aromatase. 2-Methyl and 2-methylene steroids 5, 6, and 17 were good competitive inhibitors of aromatase
为了深入了解芳香化酶的雄烯二酮(AD)结合(活性)位点相对于酶催化功能的空间性质,我们合成了2,2-二甲基AD(4),2beta-和2alpha-methylADs(5和6),化合物4和6的19-氧化衍生物以及2-亚甲基AD(17),然后我们测试了它们的抑制活性以及其芳香化酶反应(2-甲基和2-亚甲基类似物的芳构化或19-氧化2,2-二甲基类固醇)与人类胎盘芳香化酶。2-甲基和2-亚甲基类固醇5、6和17是芳香化酶的良好竞争性抑制剂(K(i)= 22-68nM),但与2,2-二甲基类似物4(K(i)= 8.8nM),表明2β-和2α-甲基部分的组合对于形成热力学稳定的抑制剂-芳香酶复杂是必不可少的。一系列2α-甲基类固醇是芳香化酶的良好底物,而2β-甲基类固醇5是极差的底物,而一系列2,2-二甲基类固醇没有作为底物,表明该蛋白的2β-甲基部分2,2-二甲基和2β-甲基类固醇可能会阻止芳香化