门式分子识别和客人的动态歧视
Stephen Rieth1, Xiaoguang Bao, Bao-Yu Wang
1Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.
Journal of the American Chemical Society
|December 30, 2009
概括
封闭分子封装的动力学取决于热力学有利性和客体特性. 这项研究量化了这些关系的分子篮子,揭示了基于大小的歧视.
科学领域:
- 超分子化学 超分子化学
- 化学动力学 化学动力学
- 酵素仿真是一种很好的方法.
背景情况:
- 酶利用封闭机制来控制基质的访问和反应速度.
- 在人工系统中理解和复制酶门对于操纵化学反应性至关重要.
- 规范封闭分子封装的定量关系目前尚不清楚.
研究的目的:
- 为了研究封闭分子封装的热力学和动力学之间的相互依赖.
- 为了建立由分子篮子介导的封装过程的定量关系.
- 探索客房属性如何影响封装的动力学.
主要方法:
- 检查了封装热力学 (DeltaG ((o)) 和动力学 (DeltaG ((in) ((((双刀) 和DeltaG ((out) (((双刀)) 一系列客人与一个封闭的分子篮子.
- 分析了主机-客人亲和力和激活自由能量之间的线性相关性.
- 评估了客体大小和形状对封装动态的影响.
主要成果:
- 观察到宿主-客人亲和力和激活自由能量之间的线性相关性.
- 方程DeltaG ((双刀) = rhoDeltaG ((o) + delta描述了类似大小的客人的关系.
- 封装动力学偏离了显著不同尺寸的客人自由能量趋势,表明尺寸依赖的歧视.
结论:
- 封闭封装的动力学受封装的热力学优势和客人的身体形状的影响.
- 分子篮可以动态调节它们的结合点,以根据大小和形状区分客人,当热力学潜力恒定时.
- 这项工作提供了对人工系统中受酶启发的关门机制的定量见解.
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