通过主细胞信号调节器与受体相互作用的蛋白激酶1进行粉样纤维组合的结构基础
Paula Polonio1,2, Jorge Pedro López-Alonso3,4, Hanxing Jiang3
1Instituto de Química Física Blas Cabrera (IQF-CSIC), Madrid, Spain.
Nature communications
|October 31, 2025
概括
研究人员确定了人类RIPK1 (hRIPK1) 粉样纤维的原子结构,揭示了N形折叠对亡信号传递至关重要. 这一发现促进了对功能性粉样蛋白组合和RIPK1-RIPK3相互作用的理解.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 细胞生物学 细胞生物学
背景情况:
- 与受体相互作用的蛋白激酶1和3 (RIPK1和RIPK3) 使用RIP同型相互作用动机 (RHIM) 形成粉样纤维.
- 这些RHIM介导的纤维细胞对于传播细胞死亡信号,特别是亡信号至关重要.
- 之前的研究阐明了人类RIPK3 (hRIPK3) 同体纤维和RIPK1-RIPK3异体纤维的结构,但hRIPK1同体纤维结构仍然未知.
研究的目的:
- 为了确定人类RIPK1 (hRIPK1) 同素粉样蛋白纤维的高分辨率原子结构.
- 在RIPK1.1.中阐明RHIM介导的粉样组合的结构基础.
- 了解hRIPK1纤维结构在核化RIPK3招募致死细胞的作用.
主要方法:
- 整合性结构生物学方法.
- 通过冷探测检测的固态核磁共振 (ssNMR) 光谱学.
- 低温电子显微镜 (低温电子显微镜).
主要成果:
- 确定了hRIPK1 RHIM介导的粉样纤维的高分辨率结构.
- 这些纤维采用了由三个β片组成的N形折叠.
- 稳定是通过疏水相互作用和结合实现的,包括一个关键的N545-G542结合,与hRIPK3纤维相比,增强侧链包装.
结论:
- 确定的结构为hRIPK1同质纤维素形成提供了原子水平的见解.
- 这种结构解释了hRIPK1纤维素如何在死中核化后续的hRIPK3招募和纤维化.
- 这些发现为控制RHIM介导的功能性粉样蛋白组合的分子机制提供了更广泛的视角.
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