A Fluoro Analogue of the Menadione Derivative 6-[2‘-(3‘-Methyl)-1‘,4‘-naphthoquinolyl]hexanoic Acid Is a Suicide Substrate of Glutathione Reductase. Crystal Structure of the Alkylated Human Enzyme
作者:Holger Bauer、Karin Fritz-Wolf、Andreas Winzer、Sebastian Kühner、Susan Little、Vanessa Yardley、Hervé Vezin、Bruce Palfey、R. Heiner Schirmer、Elisabeth Davioud-Charvet
DOI:10.1021/ja061155v
日期:2006.8.1
cells and in the causative agent of tropical malaria, Plasmodium falciparum. Glutathione reductase inhibitors were shown to have anticancer and antimalarial activity per se and to contribute to the reversal of drug resistance. The development of menadione chemistry has led to the selection of 6-[2'-(3'-methyl)-1',4'-naphthoquinolyl]hexanoic acid, called M(5), as a potent reversible and uncompetitive
谷胱甘肽还原酶是人体细胞和热带疟疾病原体恶性疟原虫中氧化还原稳态的重要管家酶。谷胱甘肽还原酶抑制剂本身被证明具有抗癌和抗疟活性,并有助于逆转耐药性。甲萘醌化学的发展导致选择 6-[2'-(3'-methyl)-1',4'-naphthoquinolyl] 己酸,称为 M(5),作为两者的有效可逆和非竞争性抑制剂人和恶性疟原虫谷胱甘肽还原酶。在这里,我们描述了作为两种酶的基于机制的抑制剂的氟甲基-M(5) 类似物的合成和动力学表征。在酶催化过程中,硅化物底物被一电子或二电子还原激活,然后在消除氟时产生高反应性的醌甲基化物。因此,发现人类酶不可逆地失活,ak(inact) 值为 0.4 +/- 0.2 min(-1)。烷基化酶的晶体结构以 1.7 A 分辨率解析。它表明抑制剂与活性位点 Cys58 共价结合,并与 His467'、Arg347、Arg37 和 Tyr114 非共价相互作用。基于