Aziridine Analogs of [[trans-(Epoxysuccinyl)-L-leucyl]amino]-4-guanidinobutane (E-64) as Inhibitors of Cysteine Proteases
作者:Valeri Martichonok、Celine Plouffe、Andrew C. Storer、Robert Menard、J. Bryan Jones
DOI:10.1021/jm00016a011
日期:1995.8
Aziridine derivatives of E-64 have been synthesized, and their characterization against the cysteine proteases cathepsin B, cathepsin L, and papain is reported. The inhibition was found to be strongly pH-dependent, with maximum activity observed at pH 4, indicating that the protonated aziridinium ion form of the inhibitor is the more reactive form. At low pH, the peptide aziridine HO-(L)Az-Leu-NH-iAm
已经合成了E-64的氮丙啶衍生物,并且已经报道了它们对半胱氨酸蛋白酶组织蛋白酶B,组织蛋白酶L和木瓜蛋白酶的表征。发现该抑制作用强烈地依赖于pH,在pH 4时观察到最大活性,表明该抑制剂的质子化叠氮鎓离子形式是更具反应性的形式。在低pH下,肽氮丙啶HO-(L)Az-Leu-NH-iAm灭活的木瓜蛋白酶的二级速率常数kinac / Ki为7.0 x 10(4)M-1 s-1,非常有价值接近于用E-64或相应的环氧琥珀酰类似物HO-(L)Eps-Leu-NH-iAm观察到的值。这表明,通过正确的肽序列,E-64的氮丙啶类似物可能是半胱氨酸蛋白酶的良好不可逆抑制剂。氮丙啶取代环氧琥珀酰基部分不会影响针对本研究中使用的三种蛋白酶的抑制特异性。D-非对映异构体是抑制半胱氨酸蛋白酶的优选(10倍)非对映异构体。还发现iBuNH-Az-LeuPro-OH的两种非对映异构体对组织蛋白酶B的反应性均远低于i