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lysosomal mTORC1-TFEB-Rag-Regulator 超大复合体的结构
Zhicheng Cui1,2, Gennaro Napolitano3,4, Mariana E G de Araujo5
1Department of Molecular and Cell Biology, University of California Berkeley, Berkeley, CA, USA.
Nature
|January 25, 2023
概括
转录因子EB (TFEB) 通过mTORC1控制细胞功能. 显微镜显示出一个独特的
科学领域:
- 细胞生物学
- 分子生物学
- 结构生物学
背景情况:
- TFEB是溶酶体生物发生和自的关键调节剂.
- mTORC1对TFEB进行酸化,控制其活性.
- TFEB独特的mTORC1招募机制与其他基板不同.
研究的目的:
- 为了阐明TFEB招聘的结构基础mTORC1.
- 了解Rag GTPases和FLCN在TFEB酸化中的作用.
- 研究TFEB-mTORC1相互作用的机制.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定"超级复杂"结构.
- 用于分析TFEB-mTORC1相互作用的生物化学测试.
- 细胞测试以评估突变对TFEB局部化和mTORC1活性的影响.
主要成果:
- 两个Rag-Ragulator复合体呈现TFEB到mTORC1.
- 一个非正规的Rag-Regulator复合体通过RagC-GDP对接,通过酸盐结TFEB.
- 在TFEB结合的突变导致构成性核TFEB局部化.
- 该结构显示了TFEB与Rag和Raptor组件的广泛相互作用.
结论:
- TFEB-mTORC1超级复杂结构解释了对FLCN和RagC-GDP的依赖.
- 这种独特的约束机制突显了TFEB通过mTORC1的独特监管.
- 了解这种相互作用可以了解细胞平衡和疾病途径.
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