结合 (R) -BPO-27的CFTR结构揭示了一个孔隙阻塞机制
Paul G Young1,2, Karol Fiedorczuk1, Jue Chen3,4
1Laboratory of Membrane Biology and Biophysics, The Rockefeller University, New York, NY, USA.
Nature communications
|August 1, 2025
概括
选择性抑制囊性纤维化跨膜导电调节器 (CFTR) 是治疗分泌性腹和ADPKD等疾病的关键. 化合物 (R) -BPO-27阻断CFTR化孔,将离子流从ATP水解解脱开.
科学领域:
- 分子生物学分子生物学
- 结构生物学是结构生物学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 囊性纤维化跨膜导电调节器 (CFTR) 的过活化与分泌性腹和自身主导性多囊性病 (ADPKD) 有关.
- 选择性CFTR抑制为这些疾病提供了治疗途径.
- (R) -BPO-27是CFTR的有希望的候选抑制剂.
研究的目的:
- 阐明通过 (R) -BPO-27.7抑制CFTR的分子机制.
- 确定 (R) -BPO-27抑制作用的结构基础.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定与 (R) -BPO-27结合的CFTR的结构.
- 进行了生物化学测定,以评估ATP水解和化物运输.
- 进行了NBD二分化和分离的分析.
主要成果:
- 获得了与 (R) -BPO-27结合的CFTR的2.1 Å冷-EM结构.
- (R-BPO-27) 直接封闭了导孔,从ATP水解中解开了孔封闭.
- 抑制剂的结合取决于NBD分离,抑制率与NBD二元化概率相反相关.
结论:
- 这些发现澄清了 (R) -BPO-27作为CFTR抑制剂的机制,与ATP竞争不同.
- 该结构为改进的CFTR抑制剂的合理设计提供了分子基础.
- 了解NBD二元化依赖,可以了解CFTR门监管.
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