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人类TUT1:U6 snRNA复合体的冷EM结构

Seisuke Yamashita¹, Kozo Tomita¹

¹Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8562, Japan.

Nucleic acids research

|January 20, 2025

概括

终端尿基转移酶1 (TUT1) 酶使用多个域特别结合U6小核RNA (snRNA). 这种相互作用确保了精确的基-尿化,这是前信使RNA拼接的关键步骤.

科学领域:

分子生物学分子生物学
结构生物学结构生物学
在RNA生物学,RNA生物学.

背景情况:

U6小核RNA (snRNA) 是一种 ribozyme,对于前传递 RNA (前mRNA) 拼接至关重要.
在U6 snRNA上发生了表体转录组的修饰,包括由终端尿基转移酶1 (TUT1) 进行的橄-尿化,这种修饰发生在U6 snRNA上.
U6 snRNA的3'-oligo-uridylylated尾部对于U4/U6 di-snRNP的形成和高效的mRNA前拼接至关重要.

研究的目的:

阐明人类TUT1和U6之间相互作用的结构基础. snRNA.
了解TUT1如何专门识别和结合U6 snRNA以进行基-尿化.

主要方法:

使用冷电子显微镜 (cryo-EM) 来确定人类TUT1:U6 snRNA复合物的结构.

主要成果:

该结构揭示了TUT1的多个域如何紧和抓住U6 snRNA,将其3'-end定位在催化口袋中.
TUT1的特定基因和域,包括N端指 (ZF) -RNA识别基因,催化手掌,手指和C端酶相关的1域,调解相互作用.
TUT1 定了U6 snRNA体,防止在橄-尿化过程中的解离.

结论:

TUT1对U6 snRNA具有很高的特异性,利用其整个结构来确保精确的橄-尿化.
详细的结构洞察力解释了UTT1对U6snRNA识别和结合的机制,强调了它在拼接调节中的作用.

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