Synthesis and Inhibition Studies of Sulfur-Substituted Squalene Oxide Analogues as Mechanism-Based Inhibitors of 2,3-Oxidosqualene−Lanosterol Cyclase
作者:Dirk Stach、Yi Feng Zheng、Alice L. Perez、Allan C. Oehlschlager、Ikuro Abe、Glenn D. Prestwich、Peter G. Hartman
DOI:10.1021/jm960483a
日期:1997.1.1
Enzyme inhibition kinetics using homogeneous mammalian oxidosqualene cyclases (OSC) were also examined for the previously reported S-19 analogue 4. The four analogues were potent inhibitors of mammalian OSCs (IC50 = 0.05-2.3 microM for pig and rat liver OSC) and fungal cell-free Candida albicans OSC (submicromolar IC50 values). In particular, the S-18 analogue 3 showed the most potent inhibition toward
介绍了三种新的硫取代的氧化角鲨烯(OS)类似物(1-3)的合成和生物学评估。在这些类似物中,OS骨架中的C-11,C-15或C-18被硫取代。选择OS骨架中的硫位置来破坏一个或多个与环化有关的关键过程:(a)将B环折叠成船形,(b)导致马尔可夫环的反马氏环化,或(c)羊毛甾醇生物合成过程中D环的形成。还针对先前报道的S-19类似物4检查了使用均相哺乳动物氧化角鲨烯环化酶(OSC)的酶抑制动力学。这四种类似物是哺乳动物OSC的强效抑制剂(猪和大鼠肝OSC的IC50 = 0.05-2.3 microM)和真菌细胞。 -白色念珠菌OSC(亚微摩尔IC50值)。特别是,S-18类似物3对大鼠肝酶的抑制作用最强(IC50 = 50 nM),对真菌酶表现出有效的选择性抑制作用(IC50 = 0.22 nM,比S-19类似物4强10倍以上) )。因此,3是迄今为止已知的最有效的OSC抑制剂。猪OSC的Ki值范围从0