在绿色植物中质细胞tRNA分子的结构变异和进化分析
Xin Meng1, Xiao-Jing He1, Heng Liu1
1Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, 710069, China.
International journal of biological macromolecules
|March 5, 2026
概括
植物叶绿体转移RNAs (tRNAs) 显示保存的结构和独特的进化路径. 最低自由能量分析揭示了对它们的稳定性和结构变化的洞察力.
科学领域:
- 分子生物学分子生物学
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 植物叶绿体含有带有自我调节基因的圆形基因组.
- 转移RNAs (tRNAs) 对于蛋白质合成至关重要,但它们的植物叶绿体进化不清楚.
- 最小自由能量 (MFE) 和叶绿体tRNA进化之间的联系需要系统的探索.
研究的目的:
- 分析植物叶绿体基因组中tRNA基因的结构特征和进化机制.
- 调查MFE与质细胞tRNAs进化之间的关系.
- 提供关于植物叶绿体tRNAs的结构特征和进化轨迹的见解.
主要方法:
- 分析了来自122个植物叶绿体基因组的tRNA基因,共计4055个tRNA序列.
- 检查特定tRNA区域 (D-循环,可变区域,TΨC-循环) 中的核酸变异.
- 最小自由能量 (MFE) 分析和叶绿体tRNAs的遗传学分析.
主要成果:
- 叶绿体基因组编码26-37个tRNA基因;TΨC循环高度保存 (7个核酸,U-U-C-x-A-x2).
- 确定了四种不典型的tRNA类型,包括缺乏接受器臂和延长循环的类型.
- MFE分析表明,缺乏受体茎的tRNA具有更高的不稳定性,而具有延伸循环的tRNA则具有更高的稳定性.
结论:
- 植物叶绿体tRNA表现出保存的结构元素和显著的进化多样性.
- 最小的自由能量与结构稳定性相关,影响tRNA进化.
- 叶绿体tRNAs从多个祖先进化,观察到更高的过渡率和基因丢失事件.
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