Abstract
RGK proteins are small Ras-related GTP-binding proteins that function as potent inhibitors of voltage-dependent calcium channels, and two members of the family, Gem and Rad, modulate Rho-dependent remodeling of the cytoskeleton. Within the Ras superfamily, RGK proteins have distinct structural and regulatory characteristics. It is an open question as to whether RGK proteins catalyze GTP hydrolysis in vivo. Binding of calmodulin and the 14-3-3 protein to RGK proteins controls downstream pathways. Here, we discuss the structural and functional properties of RGK proteins and highlight recent work by Beguin and colleagues addressing the mechanism of Gem regulation by calmodulin and 14-3-3.
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