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, California 95616, United States.
ACS bio & med chem Au
|August 27, 2025
概括
囊性纤维化校正剂保护α子域,恢复蛋白质折叠并使二分化成为可能. 这种机制可以治疗F508del和其他罕见的囊性纤维化突变.
科学领域:
- 生物化学
- 分子生物学
- 遗传学
背景情况:
- 人类囊性纤维化转膜导电调节器 (hCFTR) 的F508del突变导致蛋白质错误折叠,损害了NBD的二分化和功能.
- 目前的折叠校正器,如elexacaftor/VX-445和lumacaftor/VX-809,显示出有希望的结果,但它们的准确校正路径尚不清楚.
研究的目的:
- 阐明hCFTR中二元化NBD1的翻译后折叠路径,特别是对折叠校正器的反应.
- 确定控制NBD1最后折叠步骤的关键非共价相互作用.
主要方法:
- 对二元化NBD1的受约束的三级非共价相互作用网络和热结构的计算分析.
- 对具有或没有F508del突变的hCFTR/E1371Q进行研究.
主要成果:
- 计算分析发现α和β子域之间的合作折叠是NBD1折叠的关键步骤,特别是在增强器结合时.
- 发现折叠校正器可以将α子域从错误折叠保护到核心形成.
- 对于转化后的NBD1折叠,提出了一种热力学保护机制,它与以沙波龙为基础的共翻译折叠不同.
结论:
- 这项研究表明,热力学机制涉及通过折叠校正器对α子域进行全质保护.
- 这种机制可以恢复F508del囊性纤维化中适当的NBD1折叠和Mg/ATP介导的NBD二分化.
- 这些发现可能会扩展到其他罕见的囊性纤维化突变的治疗策略.
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