Synthesis and antipepsin activities of peptides having a valine or valylvaline moiety at the N-terminus.
作者:KOZO OKADA、YOTARO KUROSAWA、SOTOO NAGAI
DOI:10.1248/cpb.27.2163
日期:——
A series of peptides having a valine or valyvaline moiety at the N-terminus, 1-13, was prepared and their antipepsin activities were tested. All of the peptides possessing an N-acyl-Val-Val moiety, except one, showed some inhibitory activity against pepsin, while compounds lacking N-acyl-Val-Val showed no inhibition even at a concentration of 50 μg/ml. Compound 12, a pepstatin analog, in which a tyrosine residue is present instead of AHMHA of pepstatins, was the most potent inhibitor among the synthetic peptides, but its activity was markedly lower than that of pepstatin A. Compounds 10, 12, and 13 showed neither agonistic nor antagonistic effects on pepstatin A, suggesting major differences in binding abilities of the synthetic peptides and of pepstatin A to the enzyme. The importance of the AHMHA residue of pepstatins in relation to the inhibitory activity is discussed.
合成了一系列在N端具有缬氨酸或二缬氨酸基团的肽,编号为1-13,并测试了它们的抗胃蛋白酶活性。所有具有N-酰基-缬-缬二肽基团的肽,除了一个,显示出一定的抑制胃蛋白酶活性,而缺乏N-酰基-缬-缬二肽基团的化合物即使在50μg/ml的浓度下也没有抑制作用。化合物12是pepstatin的类似物,其中的酪氨酸残基替代了pepstatins中的AHMHA,是合成肽中抑制作用最强的,但其活性明显低于pepstatin A。化合物10、12和13对pepstatin A既没有激动作用也没有拮抗作用,这表明合成肽和pepstatin A与酶的结合能力存在显著差异。文中讨论了pepstatins中AHMHA残基对抑制活性的重要性。