通过偏向性细胞内激动剂保护的B类GPCR激活
Li-Hua Zhao1,2, Qian He3,4, Qingning Yuan3
1State Key Laboratory of Drug Research, Center for Structure and Function of Drug Targets, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China. zhaolihuawendy@simm.ac.cn.
Nature
|July 31, 2023
概括
研究人员发现了针对副甲状腺激素1受体 (PTH1R) 的小分子药物的新结合部位. 这一发现可能导致B类G蛋白结合受体 (GPCR) 的口服药物.
科学领域:
- 生物化学
- 结构生物学
- 药理学
背景情况:
- B类G蛋白结合受体 (GPCR),如GLP1R和PTH1R,是关键的药物标.
- 虽然存在类药物,但这些受体的口服小分子药物仍在开发中.
研究的目的:
- 确定人类PTH1R与G蛋白和小分子激动剂结合的高分辨率结构.
- 阐明小分子激动剂PCO371的结合方式及其对药物设计的影响.
主要方法:
- 人类PTH1R与Gs和PCO371复合的高分辨率结构分析.
- 用于评估PCO371的激应活性和信号偏差的功能测试.
- 针对 PTH2R 和 GLP1R 的位点导向突变研究,以调查 PCO371 的结合保护.
主要成果:
- 在PTH1R与Gs的细胞质接口上发现了小分子激动剂PCO371的新结合部位.
- 这种结合部位与以前已知的GPCR联体结合部位有显著差异.
- PCO371作为G蛋白偏差激应剂,可以选择性地激活Gs信号,而不是阿斯特林信号.
- 在PCO371结合口袋中保存的残留物表明可能针对其他B类GPCR.
结论:
- 在PTH1R上发现了独特的PCO371结合点,为设计可口用的小分子激动剂开辟了新的途径.
- 这一发现有助于开发有偏见的激动剂,可选择调节G蛋白信号传递,从而有可能改善治疗效果.
- 绑定口袋的保存性为针对更广泛的B类GPCR提供了一个有希望的策略.
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