核受体的PROTAC介导激活,而不是降解,揭示了复杂的连接体-受体相互作用网络
Andrew D Huber1, Wenwei Lin1, Shyaron Poudel1
1Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, 262 Danny Thomas Place, MS 1000, Memphis, TN 38105-3678, USA.
针对蛋白质溶解的嵌合体 (PROTACs) 连接器的小变化可以改变蛋白质降解活性. 结构研究揭示了链接器修改如何影响目标参与和E3结合酶招募,这对PROTAC有效性至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 药物发现 药物发现 药物发现
背景情况:
- 向蛋白解酶的嵌合体 (PROTACs) 是设计用于诱导向蛋白质降解的异构功能分子.
- PROTACs的功能是通过将E3泛基因酶招募到目标蛋白质中,从而导致泛基因化和随后的蛋白质体降解.
- 连接目标结合联结体和E3联结酶联结体的链接器显著影响PROTAC活动,但基本的结构机制仍然不太清楚.
研究的目的:
- 调查 PROTAC 链接器修改影响蛋白质降解活性的结构机制.
- 描述dTAG-13的相互作用,一个准孕妇X受体 (PXR) 的PROTAC,以及其与PXR的类似物.
主要方法:
- 使用多种准方式选PROTAC.
- 对dTAG-13类似物和前体的表征.
- 对PXR联体结合域与前体联体结合的X射线晶体学.
主要成果:
- 鉴定出dTAG-13是PXR的激活剂,该激活剂可以随性结合各种联体.
- 在不诱导降解的情况下,PXR结合部分,链接器和E3带之间的相互作用调节了PXR活性.
- 晶体结构揭示了PXR结合口袋中的联体诱导的扭曲,以及与E3复合体形成不相容的链体透道.
结论:
- 链接器环境通过影响目标参与和E3联结酶招聘,对PROTAC活动产生重大影响.
- 对PXR-连接体相互作用的结构洞察力突出了PROTAC疗效对链接器设计的敏感性.
- 了解这些结构效应对于合理的 PROTAC 设计和优化至关重要.
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