Poststatin, a New Inhibitor of Prolyl Endopeptidase. VIII. Endopeptidase Inhibitory Activity of Non-peptidyl Poststatin Analogues.
作者:MAKOTO TSUDA、YASUHIKO MURAOKA、MACHIKO NAGAI、TAKAAKI AOYAGI、TOMIO TAKEUCHI
DOI:10.7164/antibiotics.49.1022
日期:——
Non-peptidyl poststatin analogues, (S)-N-substituted-2-[2-1-acylpyrrolidinyl)]-2-oxoacetamides were synthesized and examined for their inhibitory activity against prolyl endopeptidase and cathepsin B in vitro. Many compounds showed stronger activity than natural poststatin, a pentapeptide. Among them, (S)-N-cyclohexyl-2-oxo-2-[2-(1-(3-phenoxybenzoyl)pyrrolidinyl)]acetamide (22) and (S)-N-cyclohexyl-2-[2-(1-(2-naphthoyl)pyrrolidinyl)]-2-oxoacetamide (19) indicated IC50 value of 5.8 and 8.2ng/ml for prolyl endopeptidase inhibition respectively. None of these compounds possess significant inhibitory activities against cathepsin B, a cysteine protease. These results indicate that these compounds are more selective inhibitors against prolyl endopeptidase than is natural poststatin.
合成了非肽类后静止素类似物(S)-N-取代-2-[2-1-酰基吡咯烷基]-2-氧乙酰胺,并在体外对脯氨酸内肽酶和猫肽酶B的抑制活性进行了评估。许多化合物显示出比天然后静止素(一个五肽)更强的活性。其中,(S)-N-环己基-2-氧-2-[2-(1-(3-苯氧基苯甲酰)吡咯烷基)]乙酰胺(22)和(S)-N-环己基-2-[2-(1-(2-萘甲酰)吡咯烷基)]-2-氧乙酰胺(19)对脯氨酸内肽酶的抑制IC50值分别为5.8和8.2ng/ml。这些化合物对猫肽酶B(半胱氨酸蛋白酶)没有显著的抑制活性。这些结果表明,这些化合物对脯氨酸内肽酶的选择性抑制作用优于天然后静止素。