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Updated: Sep 9, 2025

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对非酶性RNA模板导向原料扩展的2'-脱氧化基质的影响

Ziyuan Fang, Orhan Acikgoz, Xiwen Jia

bioRxiv : the preprint server for biology

|September 5, 2025

概括

早期的遗传物质可能是RNA和DNA的混合物. 虽然这种组合稍微减缓了复制,但它可能有助于链分离,这对早期生命至关重要.

科学领域:

生命研究的起源
分子进化
生物化学

背景情况:

地球原始遗传物质的确切组成是未知的.
研究早期基因聚合物的稳定性和复制是了解生命起源的关键.
最近的发现表明,早期的地球可能产生了核酸和2'-脱氧核酸.

研究的目的:

评估将2'-脱氧化核酸纳入RNA的结构和功能影响.
了解dA,dI和dG等替代物如何影响RNA双重稳定性和非酶模板复制.
在早期地球条件下评估混合RNA/DNA遗传系统的可行性.

主要方法:

检查了单个2'-脱氧化蛋白-纯氨酸替代物的RNA复合体的结构和稳定性变化.
使用晶体学研究来分析结构修饰和溶解变化.
进行了动力学研究,以测量脱氧核酸与核酸的模板结合亲和度和原料延伸率.

主要成果:

发现单个2'- 脱氧- 纯酶替代物降低了RNA双重稳定性.
结晶学显示结构变化很小,但表示溶解减少是不稳定的原因.
dI和dG基板的结合速度较弱,延伸速度较慢,而dA基板的运动速度较慢,但模板亲和度较高.

结论:

一种混合的RNA/DNA原始遗传聚合物可能会出现适度降低的模板复制率.
在混合系统中更容易分离或交换的潜在好处可能会补偿复制速度较慢.
这些发现为早期遗传物质复制和进化提供了可信的化学策略.

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