SHOC2-KRAS-PP1C复合体的结构揭示了RAS异型特异性决定因素,以及对RAS抑制剂针对复合体组合的洞察力
Daniel A Bonsor1, Lorenzo I Finci1, Jacob R Potter1
1NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA.
Nature communications
|January 10, 2026
概括
这项研究揭示了正规RAS蛋白如何与SHOC2-PP1C形成较弱的复合体,影响癌症. 针对正规RAS (SKP) 和MRAS (SMP) 综合体提供了一种克服RAS驱动癌症耐药性的策略.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 在瘤学瘤学.
背景情况:
- 对于MAPK信号发送至关重要的RAF激活涉及SHOC2-RAS-PP1C复合体.
- 规范RAS异型 (KRAS,HRAS,NRAS) 形成的复合体的亲和力低于MRAS,但驱动SHOC2-依赖的癌症.
研究的目的:
- 为了阐明较低亲和度的SHOC2-规范RAS-PP1C复合体形成的结构基础.
- 研究SHOC2-RAS-PP1C复合物的双重向在癌症治疗中的潜力.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定SHOC2-KRAS-PP1C复合物的结构.
- 生物化学测试,以评估RAS抑制剂对复合体形成的影响.
- 用于双重准策略的MRAS突变体的表征.
主要成果:
- SHOC2-KRAS-PP1C (SKP) 综合体架构与SHOC2-MRAS-PP1C (SMP) 综合体不同,接触点较少,表面积较少.
- RAS 抑制剂 MRTX1133 和 RMC-6236 通过改变 RAS 开关 I/II 结构,有效地阻止 SKP 组件.
- 这些抑制剂不会影响SMP形成,因为它们不会结合MRAS,但对MRTX1133敏感的MRAS突变体表明双重向的可行性.
结论:
- 定义了SHOC2-RAS-PP1C复合体形成中的异型特异性差异.
- 对SKP和SMP组件的双重定位是克服RAS驱动癌症抵抗力的有希望的策略.
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