Coumarinic derivatives as mechanism-based inhibitors of α-chymotrypsin and human leukocyte elastase
作者:Lionel Pochet、Caroline Doucet、Georges Dive、Johan Wouters、Bernard Masereel、Michèle Reboud-Ravaux、Bernard Pirotte
DOI:10.1016/s0968-0896(00)00071-7
日期:2000.6
inhibitory potency toward alpha-CT and HLE. Cycloalkyl esters and amides were found to be essentially inactive on both enzymes. On the opposite, aromatic esters strongly inactivated alpha-CT whereas HLE was less efficiently inhibited with dichlorophenyl ester derivatives (kinact/K(I) = 4000 M(-1) s(-1) for 36). Representative examples of amide, ester, thioester and ketone derivatives were prepared in order
合成了新型香豆素衍生物,并测试了其对α-CT和HLE的抑制作用。发现环烷基酯和酰胺对两种酶基本上无活性。相反,芳香族酯强烈地使α-CT失活,而二氯苯基酯衍生物对HLE的抑制作用较弱(36的动力学/ K(I)= 4000 M(-1)s(-1))。制备酰胺,酯,硫代酯和酮衍生物的代表性实例,以评估香豆素环与苯基侧链之间的连接的影响。如修饰的胰凝乳蛋白酶的氨基酸分析所示,6-氯甲基衍生物不可逆地使α-CT失活是由于组氨酸残基的烷基化。相反,对HLE的抑制是短暂的。香豆素的内在反应性已使用配体与甲醇-水对之间的亲核反应模型进行了计算。从该计算看来,这些分子表达的抑制能力的差异不能仅通过内酯羰基对亲核攻击的反应性差异来解释。