人类Rag GTPase异构体及其与mTORC1复合物的结构
Madhanagopal Anandapadamanaban1, Glenn R Masson1, Olga Perisic1
1MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK.
概括
拉格GTPase与mTORC1结合,调节基于氨基酸的细胞生长. 它们的核酸状态控制了这种结合,RagAGTP/RagCGDP等特定状态对于mTORC1的招募和激活至关重要.
科学领域:
- 分子生物学
- 细胞信号传输
- 结构生物学
背景情况:
- 拉格GTPases是细胞生长和增殖的关键调节剂.
- 氨基酸的可用性决定了mTORC1激酶通过Rag GTPases的活性.
- 拉格异构体的核酸结合状态对于mTORC1相互作用至关重要.
研究的目的:
- 阐明Rag GTPase和mTORC1复合体形成的结构基础.
- 了解Rag GTPases对mTORC1招募的机制.
- 研究核酸状态在Rag介导的mTORC1激活中的作用.
主要方法:
- 用冷电子显微镜 (cryo-EM) 确定RagA/RagC-mTORC1复合物的结构.
- 分析RagA/RagC结构和动态的X射线晶体学.
- 研究GTP结合机制的动态研究.
主要成果:
- RagA/RagC与mTORC1的RAPTOR子单元结合的详细结构.
- 对RagAGTP/RagCGDP核酸状态对于mTORC1结合的特异性的解释.
- 揭示了异构体锁定机制,解释了突变的调节和影响.
- 拉格结合通过 lysosomal 向激活 mTORC1,而不是形状变化.
结论:
- 拉格GTPase核酸状态决定了mTORC1的招募和激活.
- RagAGTP/RagCGDP状态通过RAPTOR特别绑定了mTORC1.
- 拉格GTPases的溶酶向是mTORC1激活对氨基酸反应的主要机制.
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