Rat liver microsomal enzyme catalyzed oxidation of 1-cyclopropyl-4-phenyl-1,2,3,6-tetrahydropyridine
作者:Zhiyang Zhao、Stéphane Mabic、Simon Kuttab、Christelle Franot、Kay Castagnoli、Neal Castagnoli
DOI:10.1016/s0968-0896(98)80027-8
日期:1998.12
NADPH supplemented rat liver microsomal enzyme preparations catalyze the conversion of 1-cyclopropyl4-phenyl-1,2,3,6-tetrahydropyridine to the p-hydroxyphenyl (low yield), descyclopropyl (high yield) and 2,3-dihydropyridinium and, subsequently, pyridinium (intermediary yield) metabolites. When the methine proton of the cyclopropyl group was replaced with a deuteron, a normal deuterium isotope effect
NADPH补充的大鼠肝脏微粒体酶制剂可催化1-环丙基4-苯基-1,2,3,6-四氢吡啶向对羟基苯基的转化(低产率),去环丙基(高产率)和2,3-二氢吡啶鎓的转化,吡啶鎓(中间体产量)代谢产物。当环丙基的次甲基质子被氘核取代时,在氘代丙基环化代谢产物的形成中观察到正常的氘同位素作用(1.4),在二氢吡啶鎓代谢物上观察到相反的同位素作用(0.6)。以2,2,6,6-d4类似物为底物,在环α-碳氧化途径上观察到更大的氘同位素效应(3.6)。这些结果以及对这两个α-碳氧化途径速率的比率与初始底物浓度无关的观察结果表明,这两种途径均由一种形式的P450的相同活性位点催化。根据已为细胞色素P450催化的胺的α-碳氧化提出的代谢途径来讨论这些转化。