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ras Oncogene Inhibitors

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Cancer Chemoprevention

Part of the book series: Cancer Drug Discovery and Development ((CDD&D))

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Abstract

The mammalian ras genes, N-, Ha- and Ki-ras, encode four highly homologous 21-Kd proteins— N-and Ha-Ras, and the splice variants Ki4A- and Ki4B-Ras that function as molecular switches in the regulation of cell proliferation, survival, and differentiation. Situated at the inner surface of the plasma membrane, these proteins transmit extracellular signals from membrane-localized receptor tyrosine kinases to the nucleus. Typical of guanosine 5’ triphosphate (GTP)-binding proteins, Ras cycles between the active, GTP-bound and inactive, guanosine 5’ diphosphate (GDP)-bound states through the action of its intrinsic GTPase activity, together with the action of guanine nucleotide exchange factors and GTPase-activating proteins (GAPs). Constitutively activated forms of Ras with compromised GTPase activity that are capable of deregulated cell growth are encoded by ras genes with point mutations in codons 12, 13, or 61 (1). Activation of Ras by mutation is a frequent finding in human tumors, with an overall incidence of 30%.

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Kohl, N.E. (2004). ras Oncogene Inhibitors. In: Kelloff, G.J., Hawk, E.T., Sigman, C.C. (eds) Cancer Chemoprevention. Cancer Drug Discovery and Development. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-767-3_20

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