沿着Tpt1-催化酸从核酸转移到NAD的水晶结构和快照
Chulei Cao1, Jie Yang1, Weizhen Zhang1,2
1State Key Laboratory of Genetics and Development of Complex Phenotypes, Department of Biochemistry and Biophysics, School of Life Sciences, Fudan University, Shanghai, China.
Nature communications
|December 4, 2025
概括
这项研究揭示了Tpt1 (TkoTpt1) 的晶体结构,捕获了tRNA成熟和核酸修饰中的关键中间体. 这些发现重申了TPT1家族蛋白质在酸盐转移中的催化机制.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- Tpt1 / TRPT1 / KptA蛋白质在整个生命中被保存,对于tRNA成熟和核酸修饰至关重要.
- Tpt1促进RNA2-酸盐转移到NAD+,这是tRNA处理的关键步骤.
- 之前的研究提出了两步催化机制,但缺乏关键中间体的结构证据.
研究的目的:
- 阐明Tpt1-催化酸转移的结构基础.
- 为了捕获和描述Tpt1.1.的反应中间体和产品.
- 为Tpt1-家族蛋白质的保存催化机制提供结构性见解.
主要方法:
- 在T. kodakarensis Tpt1 (TkoTpt1) 的X射线晶体学.
- 在体外生化测试.
- 捕获的中间体和产品的结构分析.
主要成果:
- TkoTpt1的晶体结构捕获了2 --ADP-ribosylatedRNA (2 -p-ADPR-RNA) 的中间体.
- 结构还揭示了5 --ADP - 核糖化DNA (5 -p-ADPR-DNA) 的中间体和Appr>P产物.
- TkoTpt1在2-酸盐和5-酸盐转移方面表现出类似的机制.
结论:
- 捕获的结构提供了Tpt1功能的关键催化中间体的直接可视化.
- 这些发现重申并从结构上验证了Tpt1.1.的拟议的两步催化机制.
- 这项研究强调了Tpt1-介导的酸转移机制在不同核酸之间保持的性质.
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