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  • Title: Requirement of Ras-GTP-Raf complexes for activation of Raf-1 by protein kinase C.
    Author: Marais R, Light Y, Mason C, Paterson H, Olson MF, Marshall CJ.
    Journal: Science; 1998 Apr 03; 280(5360):109-12. PubMed ID: 9525855.
    Abstract:
    Receptor tyrosine kinase-mediated activation of the Raf-1 protein kinase is coupled to the small guanosine triphosphate (GTP)-binding protein Ras. By contrast, protein kinase C (PKC)-mediated activation of Raf-1 is thought to be Ras independent. Nevertheless, stimulation of PKC in COS cells led to activation of Ras and formation of Ras-Raf-1 complexes containing active Raf-1. Raf-1 mutations that prevent its association with Ras blocked activation of Raf-1 by PKC. However, the activation of Raf-1 by PKC was not blocked by dominant negative Ras, indicating that PKC activates Ras by a mechanism distinct from that initiated by activation of receptor tyrosine kinases.
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