Peptide .alpha.-keto ester, .alpha.-keto amide, and .alpha.-keto acid inhibitors of calpains and other cysteine proteases
作者:Zhaozhao Li、Girish S. Patil、Zbigniew E. Golubski、Hitoshi Hori、Kamin Tehrani、J. E. Foreman、David D. Eveleth、Raymond T. Bartus、James C. Powers
DOI:10.1021/jm00074a031
日期:1993.10
and tripeptidyl alpha-keto esters, alpha-keto amides, and alpha-keto acids having leucine in the P2 position were synthesized and evaluated as inhibitors for the cysteine proteases calpain I, calpain II, cathepsin B, and papain. In general, peptidyl alpha-keto acids were more inhibitory toward calpain I and II than alpha-keto amides, which in turn were more effective than alpha-keto esters. In the series
合成一系列在P2位具有亮氨酸的二肽基和三肽基α-酮酯,α-酮酰胺和α-酮酸,并将其评估为半胱氨酸蛋白酶钙蛋白酶I,钙蛋白酶II,组织蛋白酶B和木瓜蛋白酶的抑制剂。通常,肽基α-酮酸比α-酮酰胺对钙蛋白酶I和II的抑制作用更大,而α-酮酰胺反过来比α-酮酯更有效。在Z-Leu-AA-COOEt系列中,抑制力按以下顺序降低:Met(最低KI)> Nva> Phe> 4-Cl-Phe> Abu> Nle(最高KI)与钙蛋白酶I,而几乎相反观察到钙蛋白酶II的顺序。将二肽α-酮酯延伸至三肽α-酮酯可显着增强对组织蛋白酶B的抑制能力,但对钙蛋白酶的抑制作用较小。改变α-酮酯中的酯基并没有实质上降低钙蛋白酶I和钙蛋白酶II的KI值。N-单取代的α-酮酰胺比相应的α-酮酯是更好的抑制剂。具有疏水性烷基或具有连接的苯基的烷基的α-酮酰胺具有较低的KI值。与相应的N-单取代肽α-酮酰胺相比,N,N-二取代的