Studies on the β-Turn of Peptides. VIII. β-Turn Preferences of<i>N</i>-Acetyltetrapeptide Methylamides Related to the β-Turn Part of Gramicidin S
作者:Kazuki Sato、Tsutomu Higashijima、Rika Sugawara、Ukon Nagai
DOI:10.1246/bcsj.56.3699
日期:1983.12
N-Acetyl-L-Leu–X–L-Pro–L-Val methylamides (IIa: X=D-Ala, IIb: X=Gly, IIc: X=L-Ala) were synthesized and subjected to CD and 1H NMR measurements to study the β-turn preferences of these peptides. Temperature dependences of L-Val4–NH proton chemical shifts in CD3OH solution were in the order of IIa IIb>IIc. This order of β-turn preferences coincides with the order of the magnitudes of the Cotton effects
合成了 N-乙酰基-L-Leu-X-L-Pro-L-Val 甲酰胺(IIa:X=D-Ala,IIb:X=Gly,IIc:X=L-Ala)并进行 CD 和 1H NMR测量以研究这些肽的 β-转角偏好。L-Val4-NH 质子化学位移在 CD3OH 溶液中的温度依赖性按 IIa IIb>IIc 的顺序排列。这种 β 转角偏好的顺序与发色衍生物 N-(2,4-二硝基苯基) 四肽对硝基苯胺的 CD 光谱中棉花效应的大小顺序一致,具有相同的序列。该协议支持使用先前报道的发色团衍生物研究四肽序列转向趋势的手性方法的有效性。