通过细菌沙佩罗宁循环的基质进展的结构基础
Scott Gardner1, Michele C Darrow2, Natalya Lukoyanova1
1Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck, University of London, London WC1E 7HX, United Kingdom.
细菌的护卫者GroEL-GroES有助于蛋白质的折叠. 低温电子显微镜揭示了Rubisco在折叠周期中如何与GroEL-GroES相互作用,显示了不对称的复合体和基质相互作用.
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:
- 细菌的监护人GroEL-GroES系统有助于蛋白质的折叠.
- 这个过程涉及ATP调节的基质结合,封装和释放的循环.
研究的目的:
- 为了阐明GroEL-GroES蛋白折叠机制的结构动态.
- 为了可视化GroEL-GroES反应周期期间Rubisco基质的构造变化.
主要方法:
- 使用了冷电子显微镜 (cryoEM).
- 确定了GroEL,GroEL-ADP·BeF3和GroEL-ADP·AlF3-GroES与鲁比斯科复合的结构.
主要成果:
- 化EM结构捕获了GroEL-GroES周期内的鲁比斯科形状变化的连续快照.
- 特定的充电和疏水的GroEL残留物通过初始接触与非本地Rubisco进行中介.
- 在ATP或ADP·BeF3结合时观察到一个不对称的中间GroEL复合体,其中四个GroEL子单元结合了Rubisco,三个在接受GroES的构造中.
- 停滞不前的GroEL-ADP·AlF3-Rubisco-GroES复合体揭示了Rubisco折叠中间体通过各种残留物与GroEL-GroES相互作用.
结论:
- 在GroEL复合体中观察到的不对称性为GroES在没有基质释放的情况下的招募提供了洞察力.
- 该研究可视化了GroEL-GroES及其基板Rubisco在整个折叠过程中的动态相互作用.
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