在CCT/TRiC复杂介导蛋白质折叠周期的分子动力学映射使用衍射X射线追踪
Kazutaka Araki1, Takahiro Watanabe-Nakayama2, Daisuke Sasaki3
1AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), 6-2-3 Kashiwanoha, Chiba 277-0882, Japan.
International journal of molecular sciences
|October 14, 2023
概括
该CCT/TRiC复合体,一个分子陪伴者,使用ATP改变形状. 这项研究揭示了核酸结合如何改变其实时动态,影响蛋白质折叠.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物物理学的生物物理.
背景情况:
- CCT/TRiC复合体是参与蛋白质折叠的关键II型护卫蛋白.
- 了解其由ATP驱动的构造变化是关键,但哺乳动物沙佩罗宁的实时动态数据有限.
研究的目的:
- 使用衍射X射线追踪 (DXT) 调查哺乳动物CCT复合体的实时内分子动力学.
- 分析CCT1子单元上特定表面暴露循环区域的运动.
主要方法:
- 使用衍射X射线追踪 (DXT) 来监测毫秒级别的动态.
- 专注于CCT1子单元的三个循环区域:赤道 (E) 域,E-中间 (I) 域结点和顶峰 (A) 域.
主要成果:
- CCT1子单元主要表现出旋转运动,扭转角度显示出比倾斜角度更大的位移.
- 核酸结合显著影响动力学,诱导更紧的结构和限制E和A域运动.
- 在缺乏核酸的情况下,E-I域连接处作为一个关键轴,核酸结合时,这种作用会减少.
结论:
- 核酸结合稳定了CCT复合体构造,可能有助于基质结合和蛋白质折叠.
- 这项研究提供了使用DXT的第一个毫秒级别的实时动态数据,用于使用DXT的哺乳动物II类 Chaperonin.
- 这些发现为沙佩罗宁动态及其在蛋白质折叠周期中的作用提供了新的见解.
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