of a quinonimmonium methide intermediate is proposed. The activity of the inhibitors is very sensitive to the nature of the X benzylic substituent. An increased efficiency for the inactivation of human urokinase is observed with the sulfonium salts. The selectivity of the inactivation of u-PA compared to t-PA could be of therapeutical significance in controlling cell proliferation and invasion.
为了获得胰
蛋白酶样
蛋白酶的选择性自杀底物(包括纤溶酶原激活物,纤溶酶和凝血酶),需要一系列环肽环[Arg或Lys-aB(CH2X)-Gly4],其中取代的邻
氨基或间
氨基苯甲酰基构成潜在的亲电试剂,已经制备。用HBr / HOAc或R1R2S / TFA处理相应的苯基醚环[P1-aB(CH2O )-Gly4]得到
溴化物(X = Br)或the盐(X = + SR1R2,R1 = R2 = Me或R1 = Me和R2 =
C6H5)。这些
水溶性环肽可作为牛胰
蛋白酶和人
尿激酶(u-PA)的时间依赖性
抑制剂,但对组织纤溶酶原激活剂(t-PA)无影响,对纤溶酶和凝血酶无影响或作用较弱。含有
间氨基苯甲酸残基的化合物比其
邻氨基苯甲酸类似物更有效的灭活剂。符合预期的抑制自杀的动力学标准。提出了一种抑制机理,该抑制机理涉及甲基
喹啉铵甲基化物中间体的形成。
抑制剂的活性对X苄基取代基的性质非常敏感。用th