对GATOR2依赖性相互作用及其在氨基酸感应中的构造变化的新见解
Can Yang1, Xuan Sun1, Geng Wu1
1State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, the Joint International Research Laboratory of Metabolic and Developmental Sciences MOE, Shanghai Jiao Tong University, Shanghai, China.
Bioscience reports
|February 19, 2024
概括
GATOR2复合体通过感知氨基酸来调节细胞生长. 这项研究显示了GATOR2的存在.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 拉巴胺素复合体1 (mTORC1) 的机械标协调了真核细胞生长.
- 由WDR59,Mios,WDR24,Seh1L和Sec13组成的GATOR2复合体对于氨基酸感应和mTORC1调节至关重要.
- GATOR2与氨基酸传感器CASTOR1和Sestrin2以及GATOR1复合体相互作用,使用β螺旋进行这些相互作用.
研究的目的:
- 阐明氨基酸传感器和GATOR2复合体之间的相互作用的结构基础.
- 为了研究 GATOR2 的β-螺旋在调解氨基酸传感中的作用.
- 提供对mTORC1信号调节的结构性见解.
主要方法:
- 利用AlphaFold2 (AF2) 来预测与传感器相互作用的GATOR2组件的结构模型.
- 采用生物化学实验和分子动力学 (MD) 模拟来评估接口残留的功能.
- 使用光共振能量转移 (FRET) 分析来检测GATOR2对氨基酸信号的反应中的结构变化.
主要成果:
- 预测关键接口的结构模型,包括Sentrin2-WDR24-Seh1L和CASTOR1-Miosβ螺旋.
- 生物化学和MD模拟验证了接口残留的重要性.
- FRET分析表明,在氨基酸感应时,GATOR2的结构转变发生,而Mios β-螺旋的缺失会影响这种反应.
结论:
- 提供了关于GATOR2如何与氨基酸传感器结合的新型结构视角.
- 突出了GATOR2的β螺旋在信号传导中的关键作用.
- 这些发现为未来的结构确定和这一重要途径的功能研究铺平了道路.
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