计算模型预测了Rho-GTPase对Rap1b上的plexin受体GAP活性结合的功能,通过动态全变化
Nisha Bhattarai1, Lindsay Morrison2, Alexandre F Gomes2
1Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, Ohio, USA.
Protein science : a publication of the Protein Society
|June 23, 2025
概括
模拟了plexin-GTPase相互作用,揭示了与单个或多个GTPases结合时不同的动态和网络变化. 这些发现澄清了plexin信号传递机制.
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
- 结构生物学 结构生物学
背景情况:
- 普雷克辛-赛马福林信号传递对于细胞迁移,神经元发育,血管生成和免疫反应至关重要.
- 素通过细胞内域直接结合活性Rho和Ras家族GTPases,包括Rho-GTPase结合和GTPase激活蛋白 (GAP) 分段.
- 素-GTPase相互作用的结构动力学,特别是多个GTPase的结构动力学,仍然不完全理解.
研究的目的:
- 调查plexin-B1在与单个或多个GTPases结合时的结构动态和网络变化.
- 在不同的结合条件下,将plexin-B1与Rap1b (Ras),Rnd1 (Rho) 和Rac1 (Rho) 的结合稳定性和相互作用网络进行比较.
主要方法:
- 在六种不同的plexin-B1-GTPase结合系统上进行了分子动力学模拟.
- 分析包括结构变化,网络中心性和交互稳定性.
- 计算模型与实验性-交换质谱数据进行了验证.
主要成果:
- 与Rnd1相比,Rac1更容易改变plexin-B1动态,这取决于Rap1b与GAP域的结合.
- 在没有Rap1b的情况下,Rnd1与plexin-B1的相互作用更强,更稳定,而Rac1的相互作用较少,更不稳定.
- 当plexin-B1与Ras和Rho-GTPases结合,而不是单个GTPase时,网络动态显著不同.
结论:
- 计算模型为plexin-GTPase相互作用的分子机制提供了洞察力.
- 了解这些动态是解读复杂的GTPase信号通路的关键.
- 这些发现与实验数据一致,增强了我们对plexin介导的细胞过程的理解.
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