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酸酸化调节了焦点粘附组件的焦点粘附.
Saurav Kumar1, Amanda Stainer1, Julien Dubrulle1
1Fred Hutchinson Cancer Center, Seattle, United States.
eLife
|July 25, 2023
概括
细胞附着触发信号,但其在焦点粘附组件中的作用仍然不清楚. 我们发现,Cas酸化先于整合素激活,揭示了焦点粘附形成的两步模型.
科学领域:
- 细胞生物学 细胞生物学
- 分子信号传递是分子信号传递.
- 生物化学 生化学
背景情况:
- 通过整合素介导的细胞附着启动了快速的氨酸激酶信号传递,这对细胞过程至关重要.
- 这种信号在整合素激活和焦点粘附组合中的确切作用尚未完全理解.
- Crk相关基质 (Cas) 是已知的Src家族激酶 (SFKs) 的基质,也是信号通路的关键参与者.
研究的目的:
- 阐明Cas酸化及其效应因子在整合素介导细胞附着的早期阶段的作用.
- 调查导致焦点粘附组件的连续事件.
- 根据观察到的信号动态,提出焦点粘附形成模型.
主要方法:
- 免疫光显微镜可视化酸团和蛋白质定位.
- 生物化学测试以评估蛋白质酸化和相关性.
- 细胞扩散测试对不同细胞外矩阵蛋白 (原,纤维蛋白) 进行测试.
- 基因操纵 (例如,使用siRNA) 来确定特定蛋白质 (Cas,Crk/CrkL,SFKs,Rac1,素) 的要求.
主要成果:
- 化Cas (-Cas) 和其效应器 (Crk/CrkL) 形成了前来于焦点粘附组件的集群,并含有非活性整合素β1.1.
- 在不同类型的细胞中,Cas对于细胞扩散和聚焦粘附组合在原和纤维菌素上至关重要.
- 卡斯集群的形成取决于卡斯,Crk/CrkL,SFK和Rac1,但不是素.
- 由活性氧物种和无素蛋白酶体系统调节的Rac1信号传递,为Cas酸化提供反.
结论:
- 提出了一个用于焦点粘附组件的两步模型,由含有非活性整合素β1.1的-Cas集群启动.
- 涉及Rac1的积极反机制推动了这些初始集群的增长.
- 集成激活和招募核心焦点粘附蛋白,如素发生在这些初始的Cas-based信号枢纽的形成后.
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