A Chirally Stable, Atropoisomeric,Cα-Tetrasubstitutedα-Amino Acid: Incorporation into Model Peptides and Conformational Preference
作者:Fernando Formaggio、Cristina Peggion、Marco Crisma、Claudio Toniolo、Luba Tchertanov、Jean Guilhem、Jean-Paul Mazaleyrat、Yolaine Goubard、Anne Gaucher、Michel Wakselman
DOI:10.1002/1522-2675(20010228)84:2<481::aid-hlca481>3.0.co;2-c
日期:2001.2.28
A variety of model peptides, including four complete homologous series, to the pentamer level, characterized by the recently proposed binaphthyl-based, axially chiral, Cα-tetrasubstituted, cyclic α-amino acid Bin, in combination with Ala, Gly, or Aib residues, was synthesized by solution methods and fully characterized. The solution conformational propensity of these peptides was determined by FT-IR
多种模型肽,包括四个完整的同源系列,达到五聚体水平,其特征是最近提出的基于联萘的轴向手性 Cα-四取代的环状 α-氨基酸 Bin,与 Ala、Gly 或 Aib 残基组合, 通过溶液法合成并充分表征。这些肽的溶液构象倾向通过FT-IR吸收和1H-NMR技术确定。此外,通过 X 射线衍射在晶体状态下评估了游离氨基酸 (S)-对映异构体和具有异手性序列 -(R)-Bin-Phe- 的 Nα-酰化二肽烷基酰胺的分子结构。综上所述,结果表明含Bin的肽优先采用β-弯头和310个螺旋,尽管在某种程度上,短低聚物在溶液中也会采用完全延伸的构象。我们还证实了 (R)-Bin 将肽链折叠成右手弯曲和螺旋结构的趋势。Bin 残基的绝对构型与 225 nm 附近 1Bb 联萘跃迁的典型强烈激子分裂棉花效应相关。