Amino acids and peptides. XVII. Synthesis of a tridecapeptide corresponding to the sequence 165-177 of T-kininogen (tryptic peptide) containing Gln-Val-Val-Ala-Gly sequence and the relationship between structure and effect on thiol proteinase.
作者:NAOKI TENO、SATOSHI TSUBOI、YOSHIO OKADA、NORIO ITOH、HIROSHI OKAMOTO
DOI:10.1248/cpb.35.3853
日期:——
The tridecapeptide corresponding to the sequence 165-177 of T-kininogen (tryptic peptide) (I) containing Gln-Val-Val-Ala-Gly sequence was synthesized by a conventional solution method and its effect on thiol proteinase was examined. Although Z-Gln-Val-Val-Ala-Gly-OMe showed inhibitory activity towards papain and protective activity against T-kininogen-induced inhibition of papain, the tryptic peptide obtained did not exhibit any effect on thiol proteinase. In order to study the relationship between structure and effect on thiol proteinase, several compounds (II-VI) modified with various groups at the N-terminus of the Gln-Val-Val-Ala-Gly sequence were synthesized. Peptides V and VI, which have an aromatic ring at the N-terminus, exhibited weak inhibitory and significant protective activities. A small peptide such as Gln-Val-Val-Ala-Gly might be better able to approach papain than the tryptic peptide (I), and the aromatic ring associated with Gln-Val-Val-Ala-Gly at the N-terminus apparently strengthened the binding ability of the peptide to papain.
与T-激肽原(胰蛋白酶肽)序列165-177对应的三肽(I),含有Gln-Val-Val-Ala-Gly序列,通过传统溶液法合成,并对其对巯基蛋白酶的作用进行了研究。尽管Z-Gln-Val-Val-Ala-Gly-OMe对木瓜蛋白酶表现出抑制活性,并能保护木瓜蛋白酶免受T-激肽原诱导的抑制,但所获得的胰蛋白酶肽对巯基蛋白酶没有任何作用。为了研究结构与对巯基蛋白酶作用之间的关系,合成了几种在Gln-Val-Val-Ala-Gly序列的N-末端修改了不同基团的化合物(II-VI)。具有芳香环的肽V和VI表现出弱抑制和显著保护活性。像Gln-Val-Val-Ala-Gly这样的小肽可能比肽(I)更容易接近木瓜蛋白酶,而Gln-Val-Val-Ala-Gly N-末端的芳香环显然增强了肽与木瓜蛋白酶的结合能力。