Reactome | PP2A dephosphorylates inactive RAFs

PP2A dephosphorylates inactive RAFs

Stable Identifier

R-HSA-5672961

Type

Reaction [transition]

Species

Homo sapiens

Compartment

cytosol

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Upon growth factor stimulation, RAF1 S259 (or S365 and S214 in BRAF and ARAF respectively) is dephosphorylated by PP2A and/or PP1, abrogating one of the YWHAB/14-3-3 binding sites (Terai et al, 2005; Ory et al, 2003; Kubicek et al, 2002; Jaumot et al, 2001; Rommel et al, 1996; reviewed in Roskoski, 2010; Matallanas et al, 2011). Release of 14-3-3 binding from the N-terminal site promotes a conformational change that exposes the membrane and RAS interacting RBD and CRD and facilitates recruitment of RAF to the plasma membrane where it binds RAS:GTP (Kubicek et al, 2002; Goetz et al, 2003; Ory et al, 2003). Dephosphorylation of S259/S365/S214 may also promote dimerization of RAF monomers by replacing the intramolecular 14-3-3 binding interaction with an intermolecular one (Rushworth et al, 2006; Weber et al, 2001; Ritt et al, 2010; reviewed in Matallanas et al, 2011). Although the PP2A-mediated dephosphorylation is shown as occurring before both YWHAB displacement and recruitment of RAF to the plasma membrane, the order of and relationship between these events is not completely clear. In addition, the displacement of 14-3-3 and recruitment of RAF1 to the membrane is also promoted by a direct interaction with cell cycle protein Prohibitin (PHB; Rajalingam et al, 2005; reviewed in Rajalingam and Rudel, 2005; Chowdhury et al, 2014).

Literature References

PubMed ID	Title	Journal	Year
11494123	Protein phosphatases 1 and 2A promote Raf-1 activation by regulating 14-3-3 interactions Jaumot, M, Hancock, JF	Oncogene	2001
21779496	Raf family kinases: old dogs have learned new tricks Romano, D, Matallanas, D, Rauch, J, Zebisch, A, Birtwistle, M, Kolch, W, von Kriegsheim, A	Genes Cancer	2011
12932319	Protein phosphatase 2A positively regulates Ras signaling by dephosphorylating KSR1 and Raf-1 on critical 14-3-3 binding sites Veenstra, TD, Ory, S, Zhou, M, Morrison, DK, Conrads, TP	Curr Biol	2003
14530258	Membrane localization, oligomerization, and phosphorylation are required for optimal raf activation O'Neil, JJ, Farrar, MA, Goetz, CA	J. Biol. Chem.	2003
8637718	Activated Ras displaces 14-3-3 protein from the amino terminus of c-Raf-1 Rommel, C, Moelling, K, Noeldeke, J, Heinicke, T, Jones, D, Radziwill, G, Aitken, A, Lovri?, J	Oncogene	1996
11756411	Dephosphorylation of Ser-259 regulates Raf-1 membrane association Kubicek, M, Baccarini, M, Abraham, D, Pacher, M, Eulitz, M, Podar, K	J Biol Chem	2002
16041367	Prohibitin is required for Ras-induced Raf-MEK-ERK activation and epithelial cell migration Brinkmann, V, Hekman, M, Wunder, C, Sievers, C, Rudel, T, Rajalingam, K, Churin, Y, Rapp, UR	Nat. Cell Biol.	2005
16294014	Ras-Raf signaling needs prohibitin Rudel, T, Rajalingam, K	Cell Cycle	2005
15711535	Ras binding opens c-Raf to expose the docking site for mitogen-activated protein kinase kinase Matsuda, M, Terai, K	EMBO Rep.	2005
19933846	Impact of feedback phosphorylation and Raf heterodimerization on normal and mutant B-Raf signaling Specht, SI, Monson, DM, Morrison, DK, Ritt, DA	Mol. Cell. Biol.	2010
11325826	Active Ras induces heterodimerization of cRaf and BRaf Kalmes, HA, Rapp, UR, Weber, CK, Slupsky, JR	Cancer Res.	2001
24347342	Prohibitins role in cellular survival through Ras-Raf-MEK-ERK pathway Thomas, K, Chowdhury, I, Thompson, WE	J. Cell. Physiol.	2014
20674547	RAF protein-serine/threonine kinases: structure and regulation Roskoski, R Jr	Biochem. Biophys. Res. Commun.	2010
16508002	Regulation and role of Raf-1/B-Raf heterodimerization O'Neill, E, Rushworth, LK, Hindley, AD, Kolch, W	Mol. Cell. Biol.	2006