折叠校正器与CFTR中第一个二元化核酸结合域之间的热力学合
Guangyu Wang1,2
1Department of Physiology and Membrane Biology, University of California School of Medicine, Davis, CA, USA.
Research square
|June 30, 2025
概括
折叠校正剂可以通过保护关键域来恢复囊性纤维化中的蛋白质折叠,从而实现正常功能所必需的二分化. 这种机制可能有利于患有F508del和罕见突变的患者.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 囊性纤维化通常是由人类囊性纤维化跨膜导电调节器 (hCFTR) 中的F508del突变引起的.
- 这种突变导致NBD1域的错误折叠,阻碍了对hCFTR功能至关重要的Mg/ATP依赖二分化.
- 目前的折叠校正器,如elexacaftor/VX-445和lumacaftor/VX-809显示出希望,但其精确的机制仍然不清楚.
研究的目的:
- 研究hCFTR的折叠路径,特别关注NBD1域.
- 确定参与二元化NBD1.1最终翻译后折叠的最弱非共价相互作用.
- 在F508del突变的背景下,阐明折叠校正器恢复NBD1功能的机制.
主要方法:
- 对受约束的三级非共价相互作用网络的计算分析.
- 在hCFTR/E1371Q中分析二元化NBD1的热化结构,有或没有F508del突变.
- 蛋白质折叠路径的热力学分析.
主要成果:
- 计算分析表明,二元化NBD1中的α和β子域之间的合作折叠是晚期的过程,可能由潜能器ivacaftor/VX-770.
- 折叠校正器可能会在核心形成过程中将α子域从错误折叠中保护.
- 这种保护机制不同于配翻译折叠,并且可以恢复翻译后折叠,以获得适当的Mg/ATP介导的NBD二分化.
结论:
- 通过折叠校正器的热力学保护机制可以恢复F508del囊性纤维化中翻译后的NBD1折叠.
- 这种机制促进了紧密的Mg/ATP介导的NBD二分化,这对hCFTR功能至关重要.
- 这些发现可能为患有F508del和其他罕见突变的囊性纤维化患者提供治疗见解.
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