管状组件固态NMR中成熟的HIV-1状蛋白格中的二元化接口的结构
Marvin J Bayro1, Robert Tycko1
1Laboratory of Chemical Physics National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health , Bethesda, Maryland 20892-0520, United States.
Journal of the American Chemical Society
|June 15, 2016
概括
在成熟的病毒中,HIV-1 囊蛋白 (CA) 形成一个曲的晶格. 固态NMR揭示了CA二元化接口的独特,有序的结构,挑战了以前的障碍模型,并显示了网格曲率不需要接口变化.
科学领域:
- 结构生物学
- 病毒学
- 生物物理
背景情况:
- 艾滋病毒-1囊蛋白 (CA) 在成熟的病毒中形成关键的外,包围病毒RNA.
- 之前的模型表明在曲格子中的CA二元化界面存在障碍,影响结构理解.
- CA二元化接口的高分辨率结构显示晶体学和NMR方法之间的差异.
研究的目的:
- 在非晶体管状组件中确定HIV-1 CA二元化接口的高分辨率结构.
- 通过模拟成熟的病毒体,研究CA二元化接口的结构顺序.
- 评估二元化接口在HIV-1状晶格曲线中的作用.
主要方法:
- 在管状CA组件上进行固态NMR光谱.
- 使用二极复合量化测量分子间和分子内距离.
- 测定长距离侧链侧链接触和化学转移.
主要成果:
- 在非晶体CA管中确定了CA二元化接口的独特高分辨率结构.
- 固态NMR数据与冷EM束相结合, 显示出有序的二分化接口.
- 这项研究表明,HIV- 1状晶格的曲率不依赖于二元化界面的障碍.
结论:
- 艾滋病毒-1 CA二元化接口在管状组件的曲格子中结构上有序.
- 艾滋病毒-1病毒的晶格曲线不依赖于CA二元化界面的障碍或变异性.
- 现代固态核磁共振能够在大型非晶体蛋白组件中精确地确定局部结构.
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