Amino acids and peptides. XX. Inhibition of papain by succinyl-Gln-Val-Val-Ala-Ala-p-nitroanilide, a common sequence of endogenous thiol proteinase inhibitors.
作者:YOSHIO OKADA、NAOKI TENO、SATOSHI TSUBOI、KAZUNORI NAKABAYASHI、NORIO ITOH、HIROSHI OKAMOTO、NORIO NISHI
DOI:10.1248/cpb.36.1982
日期:——
Thiol proteinase inhibitors isolated from various tissues have a fairly conservative common amino acid sequence, Gln-Val-Val-Ala-Gly. We synthesized various kinds of Gln-Val-Val-Ala-Gly derivatives by the solution method. Z-Gln-Val-Val-Ala-Ala-pNA, Z-Gln-Val-Val-Ala-pNA and Z-Gln-Val-Val-pNA weakly inhibited the amidolytic activity of papain toward Bz-Arg-βNA and exhibited a stronger protective activity than corresponding Z-peptide methyl ester against thiol proteinase inhibitor (such as T-kininogen)-induced inhibition of papain.Suc-Gln-Val-Val-Ala-Ala-pNA exhibited more potent inhibitory activity toward papain than Z-Gln-Val-Val-Ala-Ala-pNA, but it did not show any protective effect. The circular dichroism spectra of the pNA derivatives and papain suggested that the pNA moiety of the peptide participated in binding with some part of the enzyme other than the catalytic site.
从各种组织中分离出的硫醇蛋白酶抑制剂具有相当保守的共同氨基酸序列,即 Gln-Val-Val-Ala-Gly。我们采用溶液法合成了多种 Gln-Val-Val-Ala-Gly 衍生物。Z-Gln-Val-Val-Ala-Ala-pNA、Z-Gln-Val-Val-Ala-pNA和Z-Gln-Val-Val-pNA能微弱地抑制木瓜蛋白酶对Bz-Arg-βNA的酰胺分解活性,对硫醇蛋白酶抑制剂(如T-激肽原)诱导的木瓜蛋白酶抑制作用的保护活性强于相应的Z肽甲酯。Suc-Gln-Val-Val-Ala-Ala-pNA 对木瓜蛋白酶的抑制活性比 Z-Gln-Val-Val-Ala-Ala-pNA 更强,但没有显示出任何保护作用。pNA 衍生物和木瓜蛋白酶的圆二色光谱表明,肽的 pNA 分子参与了与酶催化位点以外的某些部分的结合。