Designing hybrid foldamers: the effect on the peptide conformational bias of β- versus α- and γ-linear residues in alternation with (1R,2S)-2-aminocyclobutane-1-carboxylic acid
作者:Sergio Celis、Esther Gorrea、Pau Nolis、Ona Illa、Rosa M. Ortuño
DOI:10.1039/c1ob06575k
日期:——
Several oligomers constructed with (1R,2S)-2-aminocyclobutane-1-carboxylic acid and glycine, β-alanine, and γ-amino butyric acid (GABA), respectively, joined in alternation have been synthesized and studied by means of NMR and CD experiments as well as with computational calculations. Results account for the spacer length effect on folding and show that conformational preference for these hybrid peptides can be tuned from β-sheet-like folding for those containing a C2 or C4 linear segment to a helical folding for those with a C3 spacer between cyclobutane residues. The introduction of cyclic spacers between these residues does not modify the extended ribbon-type structure previously manifested in poly(cis-cyclobutane) β-oligomers.
用(1R,2S)-2-氨基环丁烷-1-羧酸、甘氨酸、β-丙氨酸和γ-氨基丁酸分别交替连接而成的几种寡聚体,已通过NMR和CD实验以及计算模拟进行了合成和研究。结果解释了间隔长度对折叠的影响,并表明这些杂合肽的构象偏好可以从含有C2或C4线性段的对β片层样折叠调节为含有C3间隔的环丁烷残基之间的螺旋折叠。在这些残基之间引入环形间隔不会改变之前在多(顺式-环丁烷)β-寡聚体中展现的扩展带状结构。