Fine Tuning of β-Peptide Foldamers: a Single Atom Replacement Holds Back the Switch from an 8-Helix to a 12-Helix
作者:Amandine Altmayer-Henzien、Valérie Declerck、Jonathan Farjon、Denis Merlet、Régis Guillot、David J. Aitken
DOI:10.1002/anie.201504126
日期:2015.9.7
length. While tACBC homooligomers assume a dominant 12‐helix conformation, the aza‐primed oligomers preferentially adopt a stabilized 8‐helix conformation for an oligomer length up to 6 residues. The (formal) single‐atom exchange at the N terminus of a tACBC oligomer thus contributes to the sustainability of the 8‐helix, which resists the switch to a 12‐helix. This effect illustrates atomic‐level programmable
环状同源氨基酸是构建螺旋折叠子的重要组成部分。N-氨基氮杂环丁烷-2-羧酸(AAzC)是反式2-氨基环丁烷羧酸(t ACBC)的氮杂类似物,具有很强的肼基肼构象特征,建议用作8螺旋引物。t研究了带有单个N末端AazC残基的ACBC低聚物,以评估AazC沿寡肽长度诱导和支持8螺旋的能力。当tACBC均聚物假定存在12螺旋结构,而氮杂引发的寡聚物优先采用稳定的8螺旋结构,以使寡聚物长度最多为6个残基。因此,t ACBC低聚物N末端的(正式)单原子交换有助于8螺旋的可持续性,从而阻止了向12螺旋的转换。该效果说明了原子级可编程设计,可对肽折叠架结构进行微调。