一个Ur-RNAome的提案
Miryam Palacios-Pérez1,2,3, Marco V José1,2
1Theoretical Biology Group, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico.
Genes
|December 23, 2023
概括
早期的RNA分子使用RNY三胞胎形成稳定的针头,这是提出的原始遗传密码. 研究人员发现了关键RNA的痕迹,但还没有遗传密码或蛋白质合成机器.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 生命的起源研究 生命的起源研究
背景情况:
- 假设最早的RNA分子已经折叠成针头或迷你螺旋结构.
- 艾根的RNY三重假设提出了一个基于RNA的原始遗传密码.
研究的目的:
- 为了描绘早期RNA分子的2D和3D构造,这些RNA分子仅由RNY三胞胎组成.
- 在早期生命形式中研究RNA的结构稳定性和进化前体.
主要方法:
- 仅包含RNY三胞胎的RNA分子的二维和三维构造的分析.
- 在26个物种 (13种细菌,13种古生物) 中,对RNY发针与混合对照进行比较的自由能量分析.
- 对RNA结构和序列的生物信息识别.
主要成果:
- RNY头发针的自由能量比它们的混合对应器持续较低,表明结构稳定.
- 检测到了核糖体RNA (16S,23S,5S),tRNA,6SRNA,RNase P和信号识别粒子RNA的痕迹.
- 基转移酶中心和抗Shine-Dalgarno序列的缺失表明没有遗传密码或蛋白质合成.
- 甘氨酸 (GCC) 和氨酸 (GGU) 的抗子在proto-tRNA发针中被确定.
结论:
- 早期的RNA分子可能存在于基于RNY三胞胎的稳定针头.
- 这些结构代表了现代RNA的前体,早于功能性遗传密码和蛋白质合成的出现.
- 这些发现提供了关于RNA在生命早期的结构和功能演变的见解.
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