RAF (rapidly accelerated fibrosarcoma) Ser/Thr kinases (ARAF, BRAF, and CRAF) link the RAS (rat sarcoma) protein family with the MAPK (mitogen-activated protein kinase) pathway and control cell growth, differentiation, development, aging, and tumorigenesis. Their activity is specifically modulated by protein–protein interactions, post-translational modifications, and conformational changes in specific spatiotemporal patterns via various upstream regulators, including the kinases, phosphatase, GTPases, and scaffold and modulator proteins. Dephosphorylation of Ser-259 (CRAF numbering) and dissociation of 14-3-3 release the RAF regulatory domains RAS-binding domain and cysteine-rich domain for interaction with RAS-GTP and membrane lipids. This, in turn, results in RAF phosphorylation at Ser-621 and 14-3-3 reassociation, followed by its dimerization and ultimately substrate binding and phosphorylation. This review focuses on structural understanding of how distinct binding partners trigger a cascade of molecular events that induces RAF kinase activation.
Structural snapshots of RAF kinase interactions
Soheila Rezaei Adariani, Marcel Buchholzer, Mohammad Akbarzadeh, Saeideh Nakhaei-Rad, Radovan Dvorsky, Mohammad Reza Ahmadian; Structural snapshots of RAF kinase interactions. Biochem Soc Trans 17 December 2018; 46 (6): 1393–1406. doi: https://doi.org/10.1042/BST20170528
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