A threading receptor for polysaccharides.

A threading receptor for polysaccharides.
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DOI:
10.1038/nchem.2395
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发表时间:
2016-01
期刊:
影响因子:
21.8
通讯作者:
Davis AP
Davis AP
中科院分区:
化学1区
文献类型:
--
作者:
Mooibroek TJ;Casas-Solvas JM;Harniman RL;Renney CM;Carter TS;Crump MP;Davis AP

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纤维素、几丁质和相关多糖是有机分子和材料的关键可再生来源。然而,溶解性差往往阻碍它们的开发。合成受体可以帮助溶解,只要它们能够协同作用,例如通过在单个多糖分子上的多个螺纹。在这里,我们报告了一种合成受体,旨在与这些天然聚合物形成螺纹复合物(polypeptidodorotaxanes)。受体在水溶液中以高亲和力(Ka高达19,000 M−1)结合多糖片段,并通过核奥弗豪泽效应光谱(NOESY)显示采用螺纹几何结构。诱导圆二色性(ICD)和原子力显微镜(AFM)的证据表明,受体也形成polypropylidorotaxane与纤维素及其聚阳离子类似物壳聚糖。这些结果为温和条件下的多糖增溶以及生物活性的新方法提供了希望。
Cellulose, chitin and related polysaccharides are key renewable sources of organic molecules and materials. However, poor solubility tends to hamper their exploitation. Synthetic receptors could aid dissolution provided they are capable of cooperative action, for example by multiple threading on a single polysaccharide molecule. Here we report a synthetic receptor designed to form threaded complexes (polypseudorotaxanes) with these natural polymers. The receptor binds fragments of the polysaccharides in aqueous solution with high affinities (Ka up to 19,000 M−1), and is shown to adopt the threading geometry by nuclear Overhauser effect spectroscopy (NOESY). Evidence from induced circular dichroism (ICD) and atomic force microscopy (AFM) implies that the receptor also forms polypseudorotaxanes with cellulose and its polycationic analogue chitosan. The results hold promise for polysaccharide solubilisation under mild conditions, as well as new approaches to biological activity.
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