关键的催化关系决定了复制器网络中的竞争结果
Tamara Kosikova1, Douglas Philp1
1School of Chemistry and EaStCHEM, University of St Andrews , North Haugh, St Andrews, Fife KY16 9ST, United Kingdom.
Journal of the American Chemical Society
|August 5, 2017
概括
一个合成复制器网络显示出一个令人惊的结果:由于交叉催化和异重复形成,效率较低的复制器 (trans-Tm) 超过了效率更高的复制器 (trans-Tp),为复制选择性提供了洞察力.
科学领域:
- 超分子化学
- 化学动力学
- 系统化学
背景情况:
- 合成复制器对于理解生命的起源和发展人工生命至关重要.
- 复制者之间的竞争是进化过程和网络动态的一个基本方面.
- 了解复制网络的选择性是设计复杂化学系统的关键.
研究的目的:
- 为了研究两个合成复制器之间的竞争动态,跨-Tp和跨-Tm,具有不同的内在效率.
- 阐明控制复制选择性的基本机制,包括交叉催化和复杂形成.
- 探索反应环境对复制者竞争的结果的影响.
主要方法:
- 用于1,3-双极循环加法反应的和马利米德变体 (Mp,Mm) 的合成.
- 使用F1NMR光谱来监测反应速率和复合物形成的动力分析.
- 计算模拟以建模动力拟合并并理解模板介导的过程.
主要成果:
- 在隔离状态下,由于更快的动力学和较低的双重稳定性,trans-Tp比trans-Tm更有效地复制.
- 在有限的酸的竞争条件下,转-Tm超过了转-Tp.
- 这一结果是由单向交叉催化路径 (跨Tp模拟跨Tm) 和更稳定的包含跨Tm的异质复合体驱动的.
结论:
- 一个关键的单向交叉催化关系决定了竞争结果,有利于最初效率较低的复制器.
- 复制器竞争受到内在复制率以外的因素的影响,包括交叉催化和异质复合稳定性.
- 这项研究为研究非理想反应环境中的选择性提供了一个框架,超越了传统的批量条件.
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