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在尺寸敏感的客体识别中,循环德克斯的边缘结合

Hiroki Hanayama¹, Junya Yamada¹, Issei Tomotsuka¹

¹Department of Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of the American Chemical Society

|April 7, 2021

概括

循环素 (CDs) 通过它们的腔和边缘来识别分子,而不仅仅是腔. 这种对尺寸敏感的边缘结合提高了比CD腔更大的客体的分子识别精度.

科学领域:

超分子化学
纳米技术
生物化学

背景情况:

循环德克斯 (CDs) 是具有疏水性腔和疏水性外表的循环寡糖.
通过CDs进行分子识别,传统上专注于腔内的客体.
在分子识别研究中,CD的边缘结合在很大程度上被忽视了.

研究的目的:

在分子识别中研究环极轮的作用.
探索循环素的尺寸敏感的结合机制.
在超分子研究中展示单分子电子显微镜的实用性.

主要方法:

使用单分子电子显微镜 (SME-EM) 进行高分辨率成像.
采用石墨圆图书馆作为复合的固态基板.
使用结构和统计方法分析了成千上万个单独的CD-guest复合体.
使用2.5毫秒分辨率的电子显微镜录像记录了动态的超分子事件.

主要成果:

通过空腔和边缘相互作用证明环氧结客.
展示了对大小敏感的结合,准确度高于γ-CD的1 Å.
对于大于CD腔的客人,观察到边缘结合.
提供了尺寸识别过程的直接视觉证据.

结论:

循环素分子识别涉及一个以前被低估的边缘结合模式.
孔腔和轮结合允许精确的尺寸区分.
动态SME-EM是一个强大的工具,用于阐明超分子复合的时空细节.

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