由IL-17受体 hetero-tetramer诱导的ACT1寡合化的结构基础
bioRxiv : the preprint server for biology
|January 23, 2026
概括
介素-17受体 (IL-17Rs) 通过它们的SEFIR域与ACT1形成信号复合体. 这项研究揭示了冷-EM结构,揭示了IL-17RA和IL-17RB如何与ACT1组装在一起以调节免疫信号.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 介素-17受体 (IL-17Rs) 对免疫反应和炎症性疾病至关重要.
- IL-17Rs形成异构复合体,通过SEFIR域相互作用通过ACT1转换器发出信号.
- 确切的IL-17R-ACT1复合体形成和信号传递的分子机制仍然难以捉摸.
研究的目的:
- 阐明IL-17受体信号复合组合的分子机制.
- 为了确定IL-17RA,IL-17RB和ACT1复合物的冷电子显微镜 (cryo-EM) 结构.
主要方法:
- 电子显微镜 (cryo-EM) 用于确定IL-17RA,IL-17RB和ACT1复合物的结构.
- 突变分析以验证拟议的结构模型.
主要成果:
- 冷-EM结构显示了IL-17RA和IL-17RB SEFIR域的不对称异构四聚体.
- IL-17RA SEFIR域构成了ACT1招募的基础,而IL-17RB稳定了IL-17RA二次体.
- 观察到IL-17RB,IL-17RA和多个ACT1分子的双链螺旋组合,IL-17RA的SEFEX域定ACT1.1,其中IL-17RA的SEFEX域定ACT1.
结论:
- 这项研究揭示了IL-17受体-ACT1信号体形成的结构基础.
- 这提供了对IL-17介导免疫信号的基础分子机制的关键见解.
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