antibacterial activity of the ornithine residues in gramicidinS, two analogs of gramicidinS, [2, 2′-L-α,γ-diaminobutyric acid]- and [2, 2′-lysine]-gramicidin S, were synthesized by the cyclization reaction of linear pentapeptide active esters with pyridine. It was indicated that the crude product of the cyclization of each of the linear active esters was composed of two components. The protected
研究短杆菌肽 S(短杆菌肽 S 的两种类似物 [2, 2'-L-α,γ-二氨基丁酸]- 和 [2, 2'-赖氨酸]-短杆菌肽 S)中鸟氨酸残基对抗菌活性的贡献, 是通过线性五肽活性酯与吡啶的环化反应合成的。表明各线性活性酯环化的粗产物由两种组分组成。受保护的环状十肽是一种溶解度较低的物质,通过分步结晶很容易分离,在氯化氢存在下将该产物氢解得到[2, 2'-二氨基丁酸]-或[2, 2'的结晶盐酸盐-赖氨酸]-短杆菌肽 S。这些环状十肽与天然短杆菌肽 S 一样具有活性;