Inactivation of <i>S</i>-Adenosyl-<scp>l</scp>-homocysteine Hydrolase and Antiviral Activity with 5‘,5‘,6‘,6‘-Tetradehydro-6‘-deoxy-6‘-halohomoadenosine Analogues (4‘-Haloacetylene Analogues Derived from Adenosine)
作者:Morris J. Robins、Stanislaw F. Wnuk、Xiaoda Yang、Chong-Sheng Yuan、Ronald T. Borchardt、Jan Balzarini、Erik De Clercq
DOI:10.1021/jm980163m
日期:1998.9.1
intermediates were deprotected to give the 6'-chloro 3a, 6'-bromo 3b, and 6'-iodo 3c acetylenic nucleoside analogues. Iodo compound 3c appears to inactivate S-adenosyl-L-homocysteine hydrolase by a type I ("cofactor depletion") mechanism since complete reduction of enzyme-bound NAD+ to NADH was observed and no release of adenine or iodide ion was detected. In contrast, incubation of the enzyme with the chloro 3a
用硝酸银和N-碘代琥珀酰亚胺(NIS)处理受保护的9-(5,6-二脱氧-β-D-核糖基-己基-5-ynofuranosyl)腺嘌呤衍生物并脱保护,得到6'-碘炔基核苷类似物3c。3-O-苯甲酰基-5,6-二脱氧-1,2-O-异亚丙基-α-D-核糖-六-5-烯呋喃糖的卤代反应生成6-卤代炔糖,将其转化为异头的1,2-二-邻乙酰基衍生物,并与6-N-苯甲酰腺嘌呤偶联。将这些中间体脱保护,得到6'-氯3a,6'-溴3b和6'-碘3c炔属核苷类似物。碘化合物3c似乎通过I型(“辅因子耗竭”)机制使S-腺苷-L-高半胱氨酸水解酶失活,因为观察到酶结合的NAD +完全还原为NADH,并且未检测到腺嘌呤或碘离子的释放。相比之下,将酶与氯3a或溴3b类似物一起温育会导致Cl-或Br-和Ade的释放,以及E-NAD +部分还原为E-NADH。化合物3a,3b和3c抑制牛痘病毒,水泡性口炎病毒,副流感3病毒和