4'-5'-Unsaturated 5'-halogenated nucleosides. Mechanism-based and competitive inhibitors of S-adenosyl-L-homocysteine hydrolase
作者:Esa T. Jarvi、James R. McCarthy、Shujaath Mehdi、Donald P. Matthews、Michael L. Edwards、Nellikunja J. Prakash、Terry L. Bowlin、Prasad S. Sunkara、Philippe Bey
DOI:10.1021/jm00106a028
日期:1991.2
an extra chlorine to the 5'-vinyl position (i.e. 51 and 52), modification of the 2'-hydroxyl group to the deoxy (34 and 35) and arabino (36 and 37) nucleosides provided competitive inhibitors of SAH hydrolase. Nucleosides 6 and 13, as well as 5'-deoxy-5',5'-difluoroadenosine (14) proved to be time-dependent inhibitors of SAH hydrolase. All three compounds are postulated to inhibit through the potent
(E)-和(Z)-5'-氟-4',5'-二氢-5'-脱氧腺苷(分别为6和13)的设计和合成,这是一类新的基于机理的S-抑制剂描述了腺苷-L-高半胱氨酸(SAH)水解酶。为了确定抑制该酶所必需的结构-活性关系,合成了许多6和13的类似物。用氯代替6(即44)中的氟,在5'-乙烯基位置(即51和52)添加额外的氯,将2'-羟基修饰为脱氧(34和35)和阿拉伯糖( 36和37)核苷提供了SAH水解酶的竞争性抑制剂。核苷6和13以及5'-脱氧-5',5'-二氟腺苷(14)被证明是SAH水解酶的时间依赖性抑制剂。假定所有这三种化合物都通过强力亲电试剂来抑制,该亲电试剂是由6或13的3'-羟基氧化成酮(即3和/或E-异构体)而形成的。与提出的通过6、13和14灭活SAH水解酶的机理一致的观察结果是,纯化的大鼠肝脏SAH水解酶与6孵育会释放1当量的氟离子(通过19F NMR),与14孵育会导致释放2当量