Bio-inspired Herringbone Foldamers: Strategy for Changing the Structure of Helices
作者:Abdulselam Adam、Gebhard Haberhauer、Christoph Wölper
DOI:10.1021/acs.joc.7b00185
日期:2017.4.21
helix changes its sign at least twice per turn. This strategy allows a remarkable change of the secondary structure via a small modification. By means of enantiomerically pure amino acids, we were able to control, for the first time, both the helicity of the helix and the form of the herringbone. The investigation of the underlying herringbone basic element and its folding to a noncanonical helix were
唑肽的环状低聚物是从多种海洋生物中分离出来的,并用于许多分子机器中。如前所示,从非手性咪唑氨基酸衍生的低聚物折叠成规范的螺旋。在这里,我们显示出微小的变化,即在δ位引入了甲基,导致相应的低聚物的二级结构发生了显着变化。代替标准的螺旋,形成了非标准的人字形螺旋。在后者中,沿螺旋线的斜率每转至少两次改变其符号。这种策略允许通过较小的修改来显着改变二级结构。通过对映体纯的氨基酸,我们首次能够控制螺旋的螺旋度和人字形的形式。通过NMR和CD光谱,以及X射线晶体学和量子化学计算,对基本的人字形基本元素及其折叠成非规范螺旋进行了研究。