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Transient Acceleration of Epidermal Growth Factor Receptor Dynamics Produces Higher-Order Signaling Clusters

机译:表皮生长因子受体动力学的瞬态加速产生高阶信号传导簇

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Cell signaling depends on spatiotemporally regulated molecular interactions. Although the movements of signaling proteins have been analyzed with various technologies, how spatial dynamics influence the molecular interactions that transduce signals is unclear. Here, we developed a single-molecule method to analyze the spatiotemporal coupling between motility, clustering, and signaling. The analysis was performed with the epidermal growth factor receptor (EGFR), which triggers signaling through its dimerization and phosphorylation after association with EGF. Our results show that the few EGFRs isolated in membrane subdomains were released by an EGF-dependent increase in their diffusion area, facilitating molecular associations and producing immobile clusters. Using a two-color single-molecule analysis, we found that the EGF-induced state transition alters the properties of the immobile clusters, allowing them to interact for extended periods with the cytoplasmic protein, GRB2. Our study reveals a novel correlation between this molecular interaction and its mesoscale dynamics, providing the initial signaling node. (C) 2018 Elsevier Ltd. All rights reserved.
机译:细胞信号传导取决于空性调节的分子相互作用。尽管已经用各种技术进行了分析了信号蛋白的运动,但空间动力学如何影响转导信号不清楚的分子相互作用。在这里,我们开发了一种单分子方法来分析运动,聚类和信号传导之间的时空耦合。用表皮生长因子受体(EGFR)进行分析,其通过与EGF相关联的二聚化和磷酸化触发信号传导。我们的研究结果表明,膜亚域中分离的少数EGFRS通过其扩散区域的EGF依赖性增加而释放,促进分子缔合和产生固定簇。使用双色单分子分析,发现EGF诱导的状态转变改变了固定簇的性质,使它们与细胞质蛋白GRB2相互作用。我们的研究揭示了该分子相互作用与其Messcale动态之间的新相关性,提供了初始信令节点。 (c)2018年elestvier有限公司保留所有权利。

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