14-3-3:Shc Scaffolds integrate phosphoserine and phosphotyrosine Signaling to regulate phosphatidylinositol 3-kinase activation and cell survival

Integrated cascades of protein tyrosine and serine/threonine phosphorylation play essential roles in transducing signals in response to growth factors and cytokines. How adaptor or scaffold proteins assemble signaling complexes through both phosphotyrosine and phosphoserine/threonine residues to regulate specific signaling pathways and biological responses is unclear. We show in multiple cell types that endogenous 14-3-3ζ is phosphorylated on Tyr179 in response to granulocyte macrophage colony-stimulating factor. Importantly, 14-3-3ζ can function as an intermolecular bridge that couples to phosphoserine residues and also directly binds the SH2 domain of Shc via Tyr179. The assembly of these 14-3-3:Shc scaffolds is specifically required for the recruitment of a phosphatidylinositol 3-kinase signaling complex and the regulation of CTL-EN cell survival in response to cytokine. The biological significance of these findings was further demonstrated using primary bone marrow-derived mast cells from 14-3-3ζ-/- mice. We show that cytokine was able to promote Akt phosphorylation and viability of primary mast cells derived from 14-3-3ζ-/- mice when reconstituted with wild type 14-3-3ζ, but the Akt phosphorylation and survival response was reduced in cells reconstituted with the Y179F mutant. Together, these results show that 14-3-3:Shc scaffolds can act as multivalent signaling nodes for the integration of both phosphoserine/threonine and phosphotyrosine pathways to regulate specific cellular responses.