2-Aroylbenzoyl Serine Proteases: Photoreversible Inhibition or Photoaffinity Labeling?
作者:Paul B. Jones、Ned A. Porter
DOI:10.1021/ja9842518
日期:1999.3.1
an acyl thrombin was isolated that showed no lytic activity but which slowly regained activity in pH 7.4 buffer. Irradiation of this acyl enzyme with 366 nm light led to an enzyme that showed no gain of lytic activity over time. Incubation of chymotrypsin with 1a−3a and 4 led to acyl enzymes which showed no activity but which regained activity slowly. Irradiation of these inactive acyl enzymes with
2-苯甲酰苯甲酸酯的苯酯被确定为丝氨酸蛋白酶糜蛋白酶和凝血酶的抑制剂。因此,对胍基苯基 2-苯甲酰苯甲酸酯 (1b) 抑制凝血酶,而相应的对硝基苯基酯 (1a) 抑制胰凝乳蛋白酶活性。制备了其他对硝基苯酯显示出作为胰凝乳蛋白酶抑制剂的活性,三种在苯甲酰基环上具有甲氧基取代:2-甲氧基 (2a)、2,5-二甲氧基 (3a) 和 2,4,5-三甲氧基苯甲酰基 (4 )。与 1b 孵育后,分离出无裂解活性但在 pH 7.4 缓冲液中缓慢恢复活性的酰基凝血酶。用 366 nm 光照射这种酰基酶导致酶的裂解活性没有随时间增加。胰凝乳蛋白酶与 1a-3a 和 4 一起孵育导致酰基酶不显示活性但缓慢恢复活性。用 366 nm 光照射这些无活性的酰基酶导致酶活性迅速增加。酰基胰凝乳蛋白酶的形成...