下游的寡核酸强烈增强了GMP与RNA原型复合物的亲和力
Chun Pong Tam1,2, Albert C Fahrenbach1,3, Anders Björkbom1,4
1Howard Hughes Medical Institute, Department of Molecular Biology and Center for Computational and Integrative Biology, Massachusetts General Hospital , 185 Cambridge Street, Boston, Massachusetts 02114, United States.
Journal of the American Chemical Society
|January 6, 2017
概括
另一种GMP并没有显著改善瓜诺辛5'-单酸盐 (GMP) 与RNA模板的结合. 然而,辅助性寡核酸显著增强了GMP结合亲和力,为早期RNA复制提供了洞察力.
科学领域:
- 分子生物学
- 生命研究的起源
- 生物化学
背景情况:
- 早期的生命假设提出了 ribozyme 催化之前的非酶性 RNA 复制.
- 了解RNA结合亲缘关系对于建模前核糖酶遗传系统至关重要.
研究的目的:
- 调查瓜诺辛5'-单酸盐 (GMP) 与RNA原型复合物的结合亲和力.
- 确定下游结合事件如何影响GMP的亲和力.
- 将非酶性结合参数与酶性RNA复制进行比较.
主要方法:
- 核磁共振 (NMR) 光谱分析分子相互作用.
- 异热定位热量计 (ITC) 用于量化结合热力学.
- 调查与下游绑定合作伙伴或不绑定GMP的情况.
主要成果:
- 通过第二个下游GMP,GMP与初级模板复合体的结合亲和力没有显著增强.
- 一种下游结合的辅助性寡核酸可将GMP结合亲和力增加大约两倍.
- 热力学数据与T7RNA聚合酶介导的复制数据进行了比较.
结论:
- 辅助性寡核酸的下游结合是增强非酶性RNA单体结合的关键因素.
- 这些发现为早期非酶性RNA复制系统的潜在机制和结合要求提供了洞察力.
- 这项研究强调了辅助分子在复杂酶进化之前促进RNA复制的重要性.
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