Sulfanyl-methylene and ethylene bridges were inserted into the molecule of endothelin-1 (ET-1) as other possible isosteric replacements of its outer disulfide linkage. The [1-deamino-1-carba]ET-1, [1-deamino-15-carba]ET-1 and [1-deamino-1,15-dicarba]ET-1 were synthesized either by a fragment condensation of protected cyclic pentadecapeptides with carboxy-terminal hexapeptides of the endothelin-1 sequence or by step-wise coupling on polymer support of the entire henicosapeptide sequences from carboxy-terminus. The analogues were devoid of uterotonic activity in comparison with the parent ET-1.
硫醇亚甲基和乙烯桥被插入内皮素-1(ET-1)分子中,作为其外部二硫键的其他可能的同位素替代物。通过保护的环状十五肽片段与内皮素-1序列的羧基末端六肽片段的片段缩合或通过聚合物支持的整个二十一肽序列的逐步耦合,合成了[1-去氨基-1-卡巴]ET-1,[1-去氨基-15-卡巴]ET-1和[1-去氨基-1,15-双卡巴]ET-1。与母体ET-1相比,这些类似物缺乏子宫收缩活性。