多种p120RasGAP与双化伙伴EphB4,p190RhoGAP和Dok1的相互作用
Kimberly J Vish1, Amy L Stiegler2, Titus J Boggon3
1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut, USA.
The Journal of biological chemistry
|July 28, 2023
概括
拉斯加普 (Rasgap) 是一种
科学领域:
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
- 蛋白质相互作用 蛋白质相互作用
背景情况:
- Ras GTPase激活蛋白 (RasGAP) 对于血管发育至关重要.
- 它与有约束力的合作伙伴的互动以及对活动的影响尚未完全理解.
- RasGAP拥有两个SH2域,这表明它具有复杂的监管作用.
研究的目的:
- 调查RasGAP招聘到有约束力的合作伙伴.
- 评估这些相互作用对RasGAP活性的影响.
- 阐明SH2域在RasGAP的时空调节中的作用.
主要方法:
- afinity测量用于量化结合强度.
- 小角度X射线散射 (SAXS) 分析形状变化.
- 评估RasGAP在结合时的催化活性.
主要成果:
- RasGAP SH2域表现出与p190RhoGAP,Dok1和EphB4.4的明显结合.
- RasGAP-EphB4 的结合亲和力比 RasGAP-p190RhoGAP 或 RasGAP-Dok1.0 弱100倍.
- 在RasGAP-EphB4和RasGAP-p190RhoGAP复合体之间观察到的形状差异.
- 这些相互作用不会影响RasGAP的催化活性.
结论:
- RasGAP利用其SH2域与多个合作伙伴进行不同的绑定交互.
- 不同的结合 afinities 和 conformations 表明特定的招募机制.
- RasGAP通过SH2域介导的相互作用实现了Ras信号的时空调节,独立于其催化活性.
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