Effect of the 7-amino substituent on the inhibitory potency of mechanism-based isocoumarin inhibitors for porcine pancreatic and human neutrophil elastases: a 1.85-.ANG. x-ray structure of the complex between porcine pancreatic elastase and 7-[(N-tosylphenylalanyl)amino]-4-chloro-3-methoxyisocoumarin
作者:Maria A. Hernandez、James C. Powers、Jan Glinski、Jozef Oleksyszyn、J. Vijayalakshmi、Edgar F. Meyer
DOI:10.1021/jm00084a018
日期:1992.3
A series of new acyl, urea, and carbonate derivatives of 7-amino-4-chloro-3-methoxyisocoumarin were synthesized and evaluated as irreversible inhibitors of human neutrophil elastase (HNE) and porcine pancreatic elastase (PPE). Inhibition of HNE is directly related to the hydrophobicity of the substituent on the 7-amino group. The N-Tos-Phe derivative (19) is the best HNE inhibitor with a second-order
合成了一系列新的7-氨基-4-氯-3-甲氧基异香豆素的酰基,脲和碳酸酯衍生物,并作为人嗜中性弹性蛋白酶(HNE)和猪胰弹性蛋白酶(PPE)的不可逆抑制剂进行了评估。HNE的抑制与7-氨基上取代基的疏水性直接相关。N-Tos-Phe衍生物(19)是最好的HNE抑制剂,其二级速率常数kobs / [I] = 200,000 M-1 s-1。该系列中最接近的类似物3,3-二苯基丙酰基衍生物5具有HNE的kobs / [I] = 130,000 M-1 s-1。与Tos-Phe衍生物19相比,苯乙酰基衍生物2和碳酸盐22和25提供了极其稳定的酶-抑制剂复合物,两种弹性蛋白酶的脱酰化半衰期均长于48小时。N-苯基脲衍生物25是PPE的最佳抑制剂,其二级速率常数kobs / [I] = 7300 M-1 s-1。以1.85-A的分辨率测定了PPE与N-甲苯磺酰基-Phe衍生物19的配合物的晶体结构,并将其精制为最终的R因子为16