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2'-脱氧利博纯素基质对非酶性RNA模板导向的原料扩展基质的影响

Ziyuan Fang¹, Orhan Acikgoz¹, Xiwen Jia^1,2

¹Howard Hughes Medical Institute, Department of Chemistry, The University of Chicago, Chicago, IL 60637, United States.

Nucleic acids research

|November 20, 2025

概括

早期的遗传物质可能包括RNA和DNA. 虽然混合聚合物复制速度较慢,但它们可能提供了更容易的线程分离,有助于生命早期的复制.

科学领域:

生物化学生物化学
分子生物学分子生物学
天体生物学天体生物学

背景情况:

地球原始遗传物质的确切组成是未知的.
非酶性模板复制和双重稳定性为早期遗传聚合物可行性提供了线索.
2'-deoxyribo-purine核酸可能在早期地球上与核酸核酸共存.

研究的目的:

调查RNA中2'-脱氧化-纯氨酸替代物的结构和功能影响.
评估这些替代物如何影响RNA双重稳定性和非酶模板复制.

主要方法:

结晶学研究分析结构变化.
动力学研究来测量模板结合率和原料延伸率.
在RNA复杂体中检查dA,dI和dG的替代.

主要成果:

单个2'-脱氧化-纯氨酸替代物降低了RNA双重稳定性.
观察到最小的结构变化,减少溶解被认为是造成不稳定的原因.
dI和dG的结合能力较弱,延伸速度较慢;dA的动力学较慢,但相比于利博纯素的相亲力度更高.

结论:

混合RNA/DNA聚合物可能经历了较慢的模板复制率.
潜在的优势,比如更容易的链分离,可能会补偿较慢的动力学.
这些发现为潜在的早期遗传系统的特性提供了洞察力.

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