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用于研究稀释和凝结蛋白相的NMR实验:适用于相分离蛋白 CAPRIN1

Leo E Wong^1,2,3, Tae Hun Kim^1,2,3,4, D Ranjith Muhandiram^1,2,3

¹Department of Molecular Genetics , University of Toronto , Toronto , Ontario M5S 1A8 , Canada.

Journal of the American Chemical Society

|January 4, 2020

概括

核磁共振 (NMR) 光谱学推进了对内在无序蛋白质 (IDP) 和区域 (IDR) 的研究. 质子检测实验为分析蛋白相分离提供了增强的灵敏度,揭示了这一关键生物过程的序列决定因素.

科学领域:

生物化学和分子生物学
生物物理
结构生物学

背景情况:

本质上无序的蛋白质 (IDP) 和本质上无序的区域 (IDR) 对于生物过程至关重要,例如通过液相分离形成凝结物.
核磁共振 (NMR) 光谱为IDP/IDR提供特定地点的结构和动态信息.
核磁共振实验的进展,包括三重共振和冷探测器,旨在对这些分子进行原子分辨率研究.

研究的目的:

评估和比较CO-detect与H-detect的NMR实验,用于在稀释和相隔状态下研究IDP/IDR.
开发和应用一套Hα检测实验用于IDP/IDR分析,特别是在中性和更高的pH值.
研究特定氨基酸序列在促进蛋白相分离中的作用.

主要方法:

对CO-detect和H-detectNMR实验进行比较,以评估灵敏度的增加.
一系列Hα检测NMR实验的开发.
将这些实验应用于CAPRIN1的失序区域,然后进行突变发生,以确认结果.

主要成果:

与检测条件下的CO检测实验相比,Hα检测NMR实验显示出显著的灵敏度增长.
从Hα检测实验中获得的残留特异性化学转移准确地预测了N终端含Arg区域对CAPRIN1相分离的重要性.
突变性实验证实了特定残留物位在控制相分离倾向方面的关键作用.

结论:

质子检测NMR实验为研究内在无序的蛋白质和区域提供了增强的灵敏度,特别是在生物相关的环境中.
关键残留物在序列中的精确定位是液相分离的关键决定因素.
在将氨基酸序列与相分离行为联系起来时,NMR光谱具有独特的功能.

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