Phosphatidylinositol 3-kinase (PIK3) is a signaling protein that phosphorylates the inositol ring of phosphatidylinositol at the 3-prime position. Signaling is initiated when upstream tyrosine kinase receptors or G protein coupled receptors are bound by their ligands. It binds to activated (phosphorylated) protein-Tyr kinases, through its SH2 domain, and acts as an adapter, mediating the association of the p110 catalytic unit to the plasma membrane. Phosphatidylinositol 3-kinase plays an important role in the metabolic actions of insulin, and a mutation in this gene has been associated with insulin resistance. During insulin stimulation, it also binds to IRS-1. Mutations in the gene can result in Agammaglobulinemia 7, SHORT syndrome, or Immunodeficiency 36.
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Protein Aliases: p55-GAMMA; phosphatidylinositol 3-kinase 55 kDa regulatory subunit gamma; Phosphatidylinositol 3-kinase 85 kDa regulatory subunit alpha; Phosphatidylinositol 3-kinase regulatory subunit alpha; phosphatidylinositol 3-kinase regulatory subunit gamma; phosphatidylinositol 3-kinase, regulatory subunit, polypeptide 1 (p85 alpha); phosphatidylinositol 3-kinase-associated p-85 alpha; Phosphoinositide 3-kinase p85 (other splicing variants: p55 and p50); Phosphoinositide 3-kinase, regulatory subunit, polypeptide 1 (p85 alpha); phosphoinositide-3-kinase regulatory subunit; phosphoinositide-3-kinase regulatory subunit alpha; phosphoinositide-3-kinase, regulatory subunit 1 (alpha); PI3-kinase p85 subunit alpha; PI3-kinase p85-subunit alpha; PI3-kinase regulatory subunit alpha; PI3-kinase subunit p85-alpha; PI3K regulatory subunit alpha; PI3K regulatory subunit gamma; polypeptide 1 p85 alpha; ptdIns-3-kinase p85-alpha; ptdIns-3-kinase regulatory subunit alpha; PtdIns-3-kinase regulatory subunit p85-al; ptdIns-3-kinase regulatory subunit p85-alpha; RP4-533D7.2
Gene Aliases: AGM7; GRB1; IMD36; p50alpha; p55alpha; p85; p85-ALPHA; p85alpha; PI3K; PI3KA; PIK3R1
Molecular Function: kinase modulator