Molecular size and flexibility as determinants of selectivity in the oxidation of N-methyl-4-phenyl-1,2,3,6-tetrahydropyridine analogs by monoamine oxidase A and B
作者:S. M. N. Efange、R. H. Michelson、A. K. Tan、M. J. Krueger、T. P. Singer
DOI:10.1021/jm00061a020
日期:1993.4
In the present study, a number of isomeric 4-naphthyl-, 4-(naphthylalkyl)-, 4-thienyl-, and 4-(thienylalkyl)tetrahydropyridines, conformationally restrained and flexible analogs of MPTP, were synthesized and evaluated as potential selective substrates of MAO A and B. In terms of the parameter (turnover number)/Km, the bulky naphthyl analogs were invariably better substrates of MAO A than kynuramine
在1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)的苯基和四氢吡啶基部分之间引入亚甲基桥导致单胺氧化酶B(MAO B)的选择性比单胺氧化酶A(毛A)。然而,该桥的延长导致选择性的完全丧失。在本研究中,合成了多种异构的4-TPP的构象受限和灵活的类似物4-萘基-,4-(萘基烷基)-,4-噻吩基-和4-(噻吩基烷基)四氢吡啶,并将其评估为潜在的选择性底物就参数(周转数)/ Km而言,笨重的萘基类似物总是比该酶的参考底物Kynuramine更好的MAO A底物。此外,所有萘类似物,无论构象迁移率如何,同样,发现所有噻吩基类似物都是MAO B的更有效底物。与萘相反,构象受约束的噻吩9a和10a被认为是MAO B的较差底物,相对于苄胺,参考底物。这些结果表明,这些化合物对MAO A或B的选择性取决于分子大小和柔韧性的复杂相互作用。在这种相互作用中,这两个因素之一可能占主导地位。这些结果表明,这些化合物对MAO