O'-(epoxyalkyl)tyrosines and (epoxyalkyl)phenylalanine as irreversible inactivators of serine proteases: synthesis and inhibition mechanism
作者:Guillermo Tous、Andrew Bush、Ana Tous、Frank Jordan
DOI:10.1021/jm00168a015
日期:1990.6
-phenylalanine were synthesized as potential serine protease inhibitors. N-Acetyl derivatives showed irreversible inactivation vis-a-vis subtilisin, while the N-benzoyl ones were specific toward chymotrypsin. The most potent inactivation of chymotrypsin was achieved by a O'-(3,4-epoxybutyl)-L-tyrosine derivative. The inactivation was shown to be stereospecific since a D derivative led to no irreversible inactivation
合成了一系列O'-(环氧烷基)酪氨酸和羧基末端(环氧烷基)酪氨酸和-苯丙氨酸作为潜在的丝氨酸蛋白酶抑制剂。N-乙酰基衍生物对枯草杆菌蛋白酶表现出不可逆的失活,而N-苯甲酰基衍生物对胰凝乳蛋白酶具有特异性。糜蛋白酶最强的失活是通过O'-(3,4-环氧丁基)-L-酪氨酸衍生物实现的。灭活被证明是立体特异性的,因为D衍生物不会导致不可逆的灭活。环氧烷基在羧基末端的放置导致有效的快速失活。在这些条件下,后来又恢复了一些活性。这两类灭活剂(O'-环氧烷基和羧基-环氧烷基)似乎是通过不同的机理起作用的。最重要的是,发现O'导致不可逆的灭活 -(环氧烷基)-L-酪氨酸仅在羧基末端为底物的情况下产生(即具有游离羧基末端的化合物不会导致失活)。最终活性动力学测定法(Daniels,SB;等人,J.Biol.Chem.1983,258,15046-15053。)表明,相对于周转率,酚氧上的环氧烷基的最佳长度为四个碳。