通过对活细胞的可逆二元化来控制EGF受体激活的空间控制
Inhee Chung1, Robert Akita, Richard Vandlen
1Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA.
Nature
|March 9, 2010
概括
皮表皮生长因子受体 (EGFR) 单体在带结合之前自发形成二次体,这对于信号传输至关重要. 这些EGFR二聚体在细胞外围被丰富,增强生长因子反应.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 皮表皮生长因子受体 (EGFR) 是一种受体氨酸激酶,与人类癌症有关.
- EGFR信号传递涉及受体二元化,通常归因于连接体诱导的形状变化.
- 之前使用组合平均值的研究尚未完全阐明 EGFR 激活机制 in situ.
研究的目的:
- 为了研究活细胞中单个EGFRs的二分化动态.
- 了解在EGFR激活中前结合体结合二聚化的作用.
- 探索EGFR二次数的空间分布和信号影响.
主要方法:
- 单分子光学跟踪使用量子点.
- 新的依赖时间的扩散性分析.
- 活细胞对EGFR动态的成像.
主要成果:
- EGFR单体自发地形成有限寿命的二元体,在连接体添加之前通过二元化臂稳定.
- 这些未结合的二极体为结合体结合和信号发送提供了初始化.
- 补充EGF导致扩散率的快速下降,与受体激活相关.
- 在细胞外围,二次体以一种依赖于活性蛋白和受体表达的方式被丰富.
- 对二极体的外周丰富增强了EGF诱导的信号传递,可能使细胞产生两极分化的反应.
结论:
- 在未结合的状态下,EGFR二分化会动态和自发地发生.
- 预先形成的EGFR二极体对于有效的信号传递在连接体结合时至关重要.
- EGFR二元体的外周局部影响细胞对生长因子的反应.
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