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RalB mobilizes the exocyst to drive cell migration.

Authors: Rosse, C  Hatzoglou, A  Parrini, MC  White, MA  Chavrier, P  Camonis, J 
Citation: Rosse C, etal., Mol Cell Biol. 2006 Jan;26(2):727-34.
Pubmed: (View Article at PubMed) PMID:16382162
DOI: Full-text: DOI:10.1128/MCB.26.2.727-734.2006

The Ras family GTPases RalA and RalB have been defined as central components of the regulatory machinery supporting tumor initiation and progression. Although it is known that Ral proteins mediate oncogenic Ras signaling and physically and functionally interact with vesicle trafficking machinery, their mechanistic contribution to oncogenic transformation is unknown. Here, we have directly evaluated the relative contribution of Ral proteins and Ral effector pathways to cell motility and directional migration. Through loss-of-function analysis, we find that RalA is not limiting for cell migration in normal mammalian epithelial cells. In contrast, RalB and the Sec6/8 complex or exocyst, an immediate downstream Ral effector complex, are required for vectorial cell motility. RalB expression is required for promoting both exocyst assembly and localization to the leading edge of moving cells. We propose that RalB regulation of exocyst function is required for the coordinated delivery of secretory vesicles to the sites of dynamic plasma membrane expansion that specify directional movement.

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CRRD Object Information
CRRD ID: 8554641
Created: 2014-05-08
Species: All species
Last Modified: 2014-05-08
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.