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人类蛋白折叠中的早期中间体,这是超快速混合实验所证明的
Adrian C Apetri1, Kosuke Maki, Heinrich Roder
1Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio 44106, USA.
Journal of the American Chemical Society
|August 31, 2006
概括
了解子蛋白折叠是子疾病机制的关键. 这项研究揭示了子蛋白折叠中的快速中间体,可能是涉及家族性疾病的错误折叠形式的前体.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 神经科学是一个神经科学.
背景情况:
- 细胞蛋白 (PrP(C)) 转化为其错误折叠的尖疹形式 (PrP(Sc)) 是病的核心.
- 之前的研究表明,在亚毫秒时间尺度上,蛋白折叠中存在一种短暂的中间体.
研究的目的:
- 用高分辨率的动力测量来阐明蛋白的折叠路径.
- 研究一个部分结构化的中间体在蛋白折叠中的作用及其与家族性蛋白疾病的关系.
主要方法:
- 使用连续流量测量与毛细血管混合系统的高时间分辨率 (约. 100微秒) 的时间.
- 研究了复合人类蛋白 (90-231) 和与格斯特曼-斯特劳斯勒-施金克病相关的突变体 (F198S) 的折叠动力学.
- 评估了pH和尿素等环境因素对折叠中间产品的影响.
主要成果:
- 直接观察到复合人类蛋白90-231的两个不同的折叠阶段:快速的中间形成 (大约. 50微秒) 和一个速度限制步骤 (大约. 700微秒) 的时间.
- 在轻微酸性pH值和在尿素的存在下,证明了中间种群的增加.
- 与野生类型相比,观察到F198S突变体中显著增加的中间种群,表明三态折叠行为.
结论:
- 这些发现提供了明确的证据,证明子蛋白折叠中的快速积累的,部分结构化的中间体.
- 这种中间体很可能是错误折叠PrP(Sc) 寡合物的直接单体前体.
- 这种中间体在与疾病相关的条件下和突变体中增加的数量突出显示了它在病原发生的意义.
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