Deuterium isotope effects for the oxidation of 1-methyl-3-phenyl-3-pyrrolinyl analogues by monoamine oxidase B
作者:Anél Pretorius、Modupe O. Ogunrombi、Gisella Terre’Blanche、Neal Castagnoli、Jacobus J. Bergh、Jacobus P. Petzer
DOI:10.1016/j.bmc.2008.09.001
日期:2008.10
corresponding 5-membered ring MPTP analogue, 1-methyl-3-phenyl-3-pyrroline, also undergoes MAO-B-catalyzed oxidation to give the 2-electron oxidation product, 1-methyl-3-phenylpyrrole. Here we report the kinetic deuterium isotope effects on V(max) and V(max)/K(m) for the steady-state oxidation of 1-methyl-3-phenyl-3-pyrroline and 1-methyl-3-(4-fluorophenyl)-3-pyrroline by baboon liver MAO-B, using the
帕金森氏诱导剂1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)是一种环状叔烯丙胺,具有良好的单胺氧化酶B(MAO-B)底物性质。MAO-B催化MPTP的环α-碳2电子生物活化,以产生1-甲基-4-苯基-2,3-二氢吡啶鎓物种(MPDP(+))。相应的5元环MPTP类似物1-甲基-3-苯基-3-吡咯啉也经过MAO-B催化氧化,得到2-电子氧化产物1-甲基-3-苯基吡咯。在这里我们报告动力学氘同位素对1-甲基-3-苯基-3-吡咯啉和1-甲基-3-(4的稳态氧化的V(max)和V(max)/ K(m)的影响-狒狒肝脏MAO-B合成-氟苯基)-3-吡咯啉,使用相应的吡咯啉-2,2,4,5,5-d(5)类似物作为氘代底物。两种底物对V(max)的表观同位素效应分别为4.29和3.98,而对V(max)/ K(m)的同位素效应分别为5.71和3.37。报道的以氘化底物MPTP-6,6-d(2)