Synthesis and Properties of a Heterodetic Cyclic Peptide: Gramicidin S Analog Containing Disulfide Bond
作者:Ken-ichi Satoh、Hirofumi Okuda、Hideaki Horimoto、Hiroaki Kodama、Michio Kondo
DOI:10.1246/bcsj.63.3467
日期:1990.12
In order to investigate the relationship between the structure of a peptide backbone and the formation of an intramolecular disulfide bond (S–S) in the peptide, a linear analog (1) of gramicidin S and a heterodetic cyclic peptide containing an S–S bond (2) were synthesized by the conventional solution method. Since a disulfide bonded compound (2) was easily formed by a treatment of the acetamidomethyl(Acm)-protected linear peptide (1) with iodine in good yield (70%), it is suggested that the mutual position between Cys1 and Cys8 residues becomes approximate, owing to the contribution of –d-Phe–Pro– part of the sequence. A heterodetic cyclic peptide (2) showed about 1/16–1/8 fold activity compared to that of GS; 1 as inactive. By the construction of an S–S bridge on the peptide backbone (1), an inactive peptide derivative was effectively converted to an active analog (2). The CD spectrum pattern also suggests that the heterodetic cyclic peptide (2) has a GS-like structure.
为了研究肽骨架结构与肽中分子内二硫键(S-S)的形成之间的关系,我们采用传统的溶液法合成了苎麻素 S 的线性类似物(1)和含有 S-S 键的杂二环肽(2)。由于用碘处理乙酰氨基甲基(Acm)保护的线性肽(1)很容易形成二硫键化合物(2),而且收率很高(70%),这表明由于序列中-d-Phe-Pro-部分的贡献,Cys1 和 Cys8 残基之间的相互位置变得近似。与 GS 相比,异源环肽(2)显示出约 1/16-1/8 倍的活性;而 1 则没有活性。通过在肽骨架(1)上构建 S-S 桥,无活性的肽衍生物被有效地转化为活性类似物(2)。CD 光谱模式也表明,杂二环肽(2)具有类似 GS 的结构。