对Mdn1的结构洞察力,这是对核糖体生物发生所必需的基本AAA蛋白
Zhen Chen1, Hiroshi Suzuki2, Yuki Kobayashi3
1Laboratory of Chemistry and Cell Biology, The Rockefeller University, New York, NY 10065, USA.
Cell
|October 16, 2018
概括
一个重要的ATPase,释放核糖体组合因子. 结构研究揭示了其MIDAS域如何对接AAA环,在60S子单元生物发生过程中促进因子释放.
科学领域:
- 分子生物学
- 结构生物学
- 生物化学
背景情况:
- Mdn1是对核糖体生物生成至关重要的大型AAA-ATPase.
- 由于其大小和有限的同质性,其重塑核糖体前体的功能尚不清楚.
- 了解Mdn1的机制是解读核糖体组合的关键.
研究的目的:
- 阐明Mdn1重塑功能的结构基础.
- 研究Mdn1如何与核糖体前体相互作用并释放组装因子.
- 了解Mdn1在ATPase活性中的独特域的作用.
主要方法:
- 使用X射线结晶学来确定S. pombe Mdn1的结构.
- 在AMPPNP和ATP与抑制剂Rbn1的存在下获得结构.
- 使用冷电磁技术获得高分辨率的结构数据.
主要成果:
- 这些结构显示Mdn1的MIDAS域通过一个长结构链接器和一个灵活的图案与其AAA环相连.
- MIDAS域以核酸依赖的方式对接AAA环.
- 在AAA环中的形状变化被传输到MIDAS域,驱动因子释放.
结论:
- Mdn1利用一个独特的结构机制,涉及其MIDAS和AAA域释放核糖体组装因子.
- 核酸结合和AAA环的构造变化调节了MIDAS域的相互作用.
- 这项研究为60S核糖体子单元生物发生的分子机制提供了关键的见解.
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