A Ras signaling complex controls the RasC-TORC2 pathway and directed cell migration.

A Ras signaling complex controls the RasC-TORC2 pathway and directed cell migration.
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DOI:
10.1016/j.devcel.2010.03.017
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发表时间:
2010-05-18
期刊:
影响因子:
11.8
通讯作者:
Firtel, Richard A.
Firtel, Richard A.
中科院分区:
生物学1区
文献类型:
--
作者:
Charest, Pascale G.;Shen, Zhouxin;Lakoduk, Ashley;Sasaki, Atsuo T.;Briggs, Steven P.;Firtel, Richard A.

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Ras被发现调节Dictyosteoblasts趋化性,但在空间和时间上控制Ras活性在趋化性的机制仍然在很大程度上未知。我们报告发现了一个Ras信号复合物,包括Ras鸟嘌呤交换因子(RasGEF)Aimless,RasGEFH,蛋白磷酸酶2A(PP 2A)和一个名为Sca 1的支架。Sca 1/RasGEF/PP 2A复合物以化学引诱物和F-肌动蛋白依赖性方式被募集到质膜,并在趋化细胞的前沿富集,在那里它通过控制RasC和下游TORC 2-Akt/蛋白激酶B(PK B)途径的激活来调节F-肌动蛋白动力学和信号中继。此外,PKB和PKB相关的PKBR 1磷酸化Sca 1和调节膜定位的Sca 1/RasGEF/PP 2A复合物,从而RasC的活动,在负反馈的方式。因此,我们的研究揭示了一种分子机制,即RasC活性和TORC 2的时空激活在趋化细胞的前沿受到严格控制。
Ras was found to regulate Dictyostelium chemotaxis, but the mechanisms that spatially and temporally control Ras activity during chemotaxis remain largely unknown. We report the discovery of a Ras signaling complex that includes the Ras guanine exchange factor (RasGEF) Aimless, RasGEFH, protein phosphatase 2A (PP2A), and a scaffold designated Sca1. The Sca1/RasGEF/PP2A complex is recruited to the plasma membrane in a chemoattractant- and F-actin-dependent manner and is enriched at the leading edge of chemotaxing cells where it regulates F-actin dynamics and signal relay by controlling the activation of RasC and the downstream TORC2-Akt/protein kinase B (PKB) pathway. In addition, PKB and PKB-related PKBR1 phosphorylate Sca1 and regulate the membrane localization of the Sca1/RasGEF/PP2A complex, and thereby RasC activity, in a negative feedback fashion. Thus, our study uncovered a molecular mechanism whereby RasC activity and the spatiotemporal activation of TORC2 are tightly controlled at the leading edge of chemotaxing cells.
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