The tyrosine-protein phosphatase SHP2 is a positive effector of EGFR signalling. SHP2 inhibits the tyrosine-dependent translocation of RasGAP (catalyses Ras inactivation) to the plasma membrane, thereby keeping it away from Ras-GTP (its substrate). This inhibition is achieved by the dephosphorylation of a RasGAP binding site on the EGF receptor.
Agazie, YM, Hayman, MJ
non-membrane spanning protein tyrosine phosphatase activity of EGF-like ligands:p-6Y-EGFR:GRB2:p-5Y-GAB1:SHP2 [plasma membrane]
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