焦点粘附激酶自抑制的结构基础
Daniel Lietha1, Xinming Cai, Derek F J Ceccarelli
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.
Cell
|June 19, 2007
概括
焦粘附激酶 (FAK) 是由其FERM域调节的,它抑制了激酶活性. 结构分析揭示了FAK激活如何涉及FERM移位和酸化,从而使细胞信号传递成为可能.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 氨酸激酶信号传递对细胞功能至关重要,依赖于精确的蛋白质相互作用和激活.
- 焦点粘附激酶 (FAK) 在整合来自细胞表面受体的信号中发挥关键作用,以控制细胞粘附,迁移和存活.
研究的目的:
- 阐明导致焦点粘附激酶 (FAK) 自抑制和激活的结构机制.
- 了解FAK的FERM域是如何调节其催化活性和与其他信号蛋白相互作用的.
主要方法:
- 采用X射线结晶学来确定FAK的自抑制和活性状态的结构.
- 进行了生物化学测试,以分析FAK的激活机制和蛋白质-蛋白质相互作用.
主要成果:
- 自抑制结构显示N端FERM域与激酶域结合,阻断催化裂并防止激活循环酸化.
- 此外,FERM域还隔离了Tyr397自化场,这是Src招募的关键区域.
- 活跃的FAK结构显示出一种对FERM域介导抑制的抗性,其次是FERM移位,自酸化和Src招募.
结论:
- 该FERM域作为FAK的内在抑制剂,使其保持在自抑制状态.
- FAK激活是一个连续的过程,涉及FERM域的位移,Tyr397的自酸化,以及随后的Src酶的招募.
- 了解FAK的结构转变,可以了解参与癌症和其他疾病的细胞信号通路的调节.
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