Homochiral Oligopeptides by Chiral Amplification within Two-Dimensional Crystalline Self-Assemblies at the Air–Water Interface; Relevance to Biomolecular Handedness
作者:Isabelle Weissbuch、Helmut Zepik、Gérard Bolbach、Edna Shavit、Mao Tang、Torben R. Jensen、Kristian Kjaer、Leslie Leiserowitz、Meir Lahav
DOI:10.1002/chem.200390205
日期:2003.4.14
Oligopeptides 2-12 units long were obtained at the air-aqueous solution interface after injection of appropriate catalysts into the water subphase. The experimental relative abundance of oligopeptides with homochiral sequence generated from (R,S)-C(18)-TE-Lys and (R,S)-C(18)-TE-Glu, as determined by mass spectrometry on enantioselectively deuterium-labeled samples, was found to be significantly larger than that
在益生元条件下,有序簇在界面上可能产生的同质手性寡肽可能发挥了可能的作用,这是通过外消旋和手性非外消旋形式的两亲性活化的α-氨基酸的催化聚合来探测的,这些外消旋和手性为非外消旋形式。在气-液界面处组装成二维(2D)有序微晶。作为模型系统,我们研究了N(ε)-硬脂酰基-赖氨酸硫代乙基酯(C(18)-TE-Lys),γ-硬脂基-谷氨酸硫代乙基酯(C(18)-TE-Glu),N(α)-羧基酐γ-硬脂基-谷氨酸(C(18)-Glu NCA)和γ-硬脂基-谷氨酸硫酸(C(18)-硫代-Glu)。根据在水表面的原位掠入射X射线衍射测量结果,(R,S)-C(18)-TE-Lys,(R,S)-C(18)-TE-Glu和(R ,S)-C(18)-Glu-NCA两亲物自组装成有序外消旋2D晶体。在将适当的催化剂注入水亚相中之后,在空气-水溶液界面处获得了2-12个单位长的寡肽。由(R,S)-C(18)-TE-