[d-Pro5,5′]-Gramicidin S was synthesized to confirm a prediction that d-d sequence at the corner position had low preference for β-turn. The analog showed much weaker activity than gramicidin S and also showed different CD spectra from those of gramicidin S. The results indicate that the analog can not take stable, gramicidin S-like, β-sheet conformation.
[d-Pro5,5′]-
短杆菌肽S的合成是为了证实一个预测:在拐角位置,d-d序列对β-转角的偏好较低。该类似物显示出远低于
短杆菌肽S的活性,并且其圆二色光谱也与
短杆菌肽S的不同。结果表明,该类似物无法采取稳定的、类似
短杆菌肽S的β-折叠构象。