菌tRNA结合酶Trl1与RNA的结构揭示了保存的基质结合原理
Sandra Köhler1, Jürgen Kopp1, Satyabrata Maiti2
1Heidelberg University, Biochemistry Center (BZH), Heidelberg, Germany.
Nature structural & molecular biology
|June 25, 2025
概括
这项研究揭示了关键的RNA酶酶Trl1-LIG的晶体结构,该酶与其RNA基质结合. 这种结构阐明了酶如何结合RNA并激活它在必要的细胞过程中连接RNA片段.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- RNA结合酶对于RNA处理,成熟和细胞应激反应,如未折叠蛋白质反应 (UPR) 至关重要.
- 在真菌和植物中的三部分tRNA连接酶 (Trl1) 连接了tRNA前子的一半,并且在UPR过程中对非传统的HAC1mRNA拼接至关重要.
- Trl1的N端腺转移酶域 (联酶;LIG) 执行了最后的RNA结合步骤,但基质结合的机制和RNA末端的空间排列仍然不清楚.
研究的目的:
- 为了阐明RNA基质结合和被Trl1-LIG域激活的结构基础.
- 了解由Trl1-LIG催化RNA末端结合的机制.
- 为了确定保存的基质结合原理和RNA末端特异性的决定因素.
主要方法:
- 使用X射线晶体学来确定Chaetomium thermophilum Trl1-LIG与tRNA衍生基质复合的结构.
- 进行了结构分析,以确定基质结合接口和酶基质相互作用.
- 生物化学试验被用来研究Trl1-LIG子域在酶激活,基质结合和催化中的作用.
主要成果:
- 晶体结构提供了与Trl1-LIG.结合的活性RNA中间体的快照.
- 确定了一种保存的基质结合接口,揭示了腺转移酶之间共享的结合原理.
- 阐明了RNA末端特异性的关键决定因素以及Trl1-LIG子域的功能作用.
结论:
- 与其RNA基质结合的Trl1-LIG的结构澄清了RNA末端结合的机制.
- 这些发现揭示了在腺转移酶中基质结合的保存机制.
- 这项工作为RNA处理,修复和展开的蛋白质反应提供了洞察力.
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