Members of the RAS subfamily of GTPases function in signal transduction as GTP/GDP-regulated switches that cycle between inactive GDP- and active GTP-bound states. Guanine nucleotide exchange factors (GEFs), such as RAPGEF2, serve as RAS activators by promoting acquisition of GTP to maintain the active GTP-bound state and are the key link between cell surface receptors and RAS activation.[2]
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↑ 2.02.12.2Rebhun JF, Castro AF, Quilliam LA (November 2000). "Identification of guanine nucleotide exchange factors (GEFs) for the Rap1 GTPase. Regulation of MR-GEF by M-Ras-GTP interaction". J Biol Chem. 275 (45): 34901–8. doi:10.1074/jbc.M005327200. PMID10934204.
↑Pham N, Cheglakov I, Koch CA, de Hoog CL, Moran MF, Rotin D (May 2000). "The guanine nucleotide exchange factor CNrasGEF activates ras in response to cAMP and cGMP". Curr. Biol. 10 (9): 555–8. doi:10.1016/S0960-9822(00)00473-5. PMID10801446.
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