作者:Ruye Xing、Robert P. Hanzlik
DOI:10.1021/jm970802d
日期:1998.4.1
Ester and amide derivatives of alpha-azaglycine (carbazic acid, H2NNHCOOH), alpha-azaalanine, and alpha-azaphenylalanine (i.e., Ac-l-Phe-NHN(R)CO-X, where X = H, CH3, or CH2Ph, respectively) were synthesized and evaluated as inhibitors of the cysteine proteinases papain and cathepsin B. The ester derivatives inactivated papain and cathepsin B at rates which increased dramatically with leaving group
α-氮杂甘氨酸(咔唑酸,H2NNHCOOH),α-氮杂丙氨酸和α-氮杂苯丙氨酸(例如,Ac-1-Phe-NHN(R)CO-X的酯和酰胺衍生物,其中X = H,CH3或CH2Ph,分别合成并评估为半胱氨酸蛋白酶木瓜蛋白酶和组织蛋白酶B的抑制剂。酯衍生物使木瓜蛋白酶和组织蛋白酶B失活,其速率随着基团疏水性和电负性的增加而显着增加。例如,对于8(R = H,X = OPh),木瓜蛋白酶失活的表观二级速率常数为67 600 M-1 s-1。酰胺和P1-硫酰胺衍生物不会灭活木瓜蛋白酶,也不是底物。相反,它们是弱竞争抑制剂(0.2 mM 24 h)。氮丙氨酸衍生物Ac-L-Phe-NHN(CH3)CO-X使木瓜蛋白酶失活。相比其氮杂甘氨酸类似物慢400-900倍,这与P1残基的Nalpha处的平面构型以及木瓜蛋白酶对其底物P1位置的L-与D-残基的立体选择性非常一致。氮杂甘氨酸衍生物9(R = H,X