Kassinin, a dodecapeptide amide isolated by Erspamer et al. from the skin of Kassina senegalensis, was synthesized by deprotection of Z (OMe)-Asp (OBzl)-Val-Pro-Lys (Z)-Ser-Asp (OBzl)-Gln-Phe-Val-Gly-Leu-Met (O)-NH2 with methanesulphonic acid, followed by reduction of the Met (O) residue to Met with 2-mercaptoethanol. The contractile activity of synthetic kassinin in isolated guinea-pig ileum was 0.4 of that of synthetic substance P.
Kassinin 是 Erspamer 等人从 Kassina senegalensis 皮肤中分离出来的十二肽酰胺,其合成方法是用
甲磺酸对 Z (OMe)-Asp (OBzl)-Val-Pro-Lys (Z)-Ser-Asp (OBzl)-Gln-Phe-Val-Gly-Leu-Met (O)-NH2 进行脱保护,然后用
2-巯基乙醇将 Met (O) 残基还原为 Met。合成卡辛素在离体豚鼠回肠中的收缩活性是合成 P 物质的 0.4。