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核糖体. 核糖体. 一个核糖体. 55S哺乳动物线粒体核糖体的完整结构

Basil J Greber¹, Philipp Bieri¹, Marc Leibundgut¹

¹Department of Biology, Institute of Molecular Biology and Biophysics, Otto-Stern-Weg 5, ETH Zurich, CH-8093 Zurich, Switzerland.

Science (New York, N.Y.)

|April 4, 2015

概括

我们确定了猪55S哺乳动物线粒体核糖体 (线粒体核糖体) 的原子结构,揭示了其分子结构和mRNA结合通道. 这提供了对蛋白质合成和氨基糖化物中毒性的洞察.

科学领域:

分子生物学分子生物学
结构生物学结构生物学
生物化学生物化学

背景情况:

哺乳动物线粒体核糖体 (线粒体核糖体) 对于合成重要膜蛋白质至关重要.
了解线粒体结构是解读线粒体功能和疾病机制的关键.

研究的目的:

为了呈现猪55S基基因组的完整原子结构.
阐明线粒体的分子结构,包括其独特的蛋白质和mRNA结合通道.

主要方法:

低温电子显微镜 (cryo-EM) 在3.8安格斯特罗姆分辨率.
化学交叉链接/质谱学.
将28S子单元的聚焦对齐到3.6安格斯特罗姆分辨率.

主要成果:

详细的原子结构的55S基因组及其28S子单元,包括15个基因组特异性蛋白质.
揭示了亚单元间接触和mRNA结合通道的架构.
提供了对mRNA招募和转移RNA相互作用的见解.

结论:

确定的结构提供了对线粒体功能的一种机械的理解.
它揭示了哺乳动物线粒体中mRNA招募的专门机制.
这些发现有助于在分子层面上理解氨基糖化物中毒性.

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