在3.1 Å分辨率的全长Tetrahymena ribozyme的冷EM结构
Zhaoming Su1,2, Kaiming Zhang3,4, Kalli Kappel5
1The State Key Laboratory of Biotherapy and Cancer Center, Department of Geriatrics and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China. zsu@scu.edu.cn.
Nature
|August 12, 2021
概括
低温电子显微镜揭示了四胺 ribozyme 的结构. 这为RNA酶的结构和功能提供了新的见解.
科学领域:
- 结构生物学
- 核糖核酸生物学
- 生物化学
背景情况:
- 单粒子冷电子显微镜 (cryo-EM) 是一种强大的蛋白质结构确定工具.
- 无蛋白RNA的冷EM研究正在出现.
- 甲基热 I 组的自我拼接内核是RNA催化的一个关键模型,但其结构尚不完全清楚.
研究的目的:
- 确定全长Tetrahyme ribozyme的高分辨率结构.
- 调查基板结合时的结构变化.
主要方法:
- 单粒子冷电子显微镜 (冷EM).
主要成果:
- 在无基质和结合状态下,通过3.1 Å分辨率获得了Tetrahymena ribozyme的冷EM结构.
- 新发现的外围区域具有同轴叠加螺旋和吻环伪结.
- 全球架构是保留的,在基质结合时,结构变化局部化到内部导向序列和瓜诺辛结合位点.
结论:
- 这项研究提供了第一个详细的结构视图的全长Tetrahymena ribozyme.
- 这些发现为RNA酶机制提供了洞察力,并为 ribozymes 的冷EM研究开辟了新的途径.
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