Gramicidin S (GS) analogs, [δAva3–4]–GS and [δAva3–4,3′–4′]–GS, were synthesized. Both of these peptides are analogs in which one or two l-leucyl-d-phenylalanyl residues of GS are replaced by one or two 5-aminovaleric acid residues. The CD spectrum of the mono-substituted analog has two troughs as that of GS. However, this analog showed almost no antimicrobial activity. Moreover, the di-substituted analog showed a CD spectrum that is ascribed to a random structure and had no antimicrobial activity.
合成了
短杆菌肽 S (GS) 类似物 [δAva3–4]–GS 和 [δAva3–4,3'–4']–GS。这两种肽都是类似物,其中GS的一个或两个1-亮
氨酰-d-苯丙
氨酰残基被一个或两个
5-氨基戊酸残基取代。单取代类似物的 CD 谱与 GS 一样有两个波谷。然而,这种类似物几乎没有表现出抗菌活性。此外,二取代类似物显示出归因于随机结构的圆二色光谱并且没有抗菌活性。