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    ARAF acts as a scaffold to stabilize BRAF:CRAF heterodimers.

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    Authors
    Rebocho, A
    Marais, Richard
    Affiliation
    The Institute of Cancer Research, London, UK.
    Issue Date
    2013-06-27
    
    Metadata
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    Abstract
    The RAF proteins are cytosolic protein kinases that regulate cell responses to extracellular signals. There are three RAF proteins in cells, ARAF, BRAF and CRAF, and recent studies have shown that the formation of complexes by these different isoforms has an important role in their activation, particularly in response to RAF inhibitors. Here, we investigated the role of ARAF in cancer cell signaling and examined the role of ARAF in mediating paradoxical activation of the MAPK pathway in cells treated with RAF inhibitors. We show that two mutations that occur in ARAF in cancer inactivate the kinase. We also show that ARAF is not functionally redundant with CRAF and cannot substitute for CRAF downstream of RAS. We further show that ARAF binds to and is activated by BRAF and that ARAF also forms complexes with CRAF. Critically, ARAF seems to stabilize BRAF:CRAF complexes in cells treated with RAF inhibitors and thereby regulate cell signaling in a subtle manner to ensure signaling efficiency.
    Citation
    ARAF acts as a scaffold to stabilize BRAF:CRAF heterodimers. 2013, 32 (26):3207-12 Oncogene
    Journal
    Oncogene
    URI
    http://hdl.handle.net/10541/300411
    DOI
    10.1038/onc.2012.330
    PubMed ID
    22926515
    Type
    Article
    Language
    en
    ISSN
    1476-5594
    ae974a485f413a2113503eed53cd6c53
    10.1038/onc.2012.330
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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