Synonyms: GRB1,p85 alpha,p85,P85A,Phosphatidylinositol 3 kinase associated p 85 alpha,Phosphatidylinositol 3 kinase regulatory 1,Phosphatidylinositol 3 kinase,regulatory subunit,polypeptide 1 (p85 alpha),Phosphatidylinositol 3-kinase 85 kDa regulatory subunit alpha,Phosphatidylinositol 3-kinase regulatory subunit alpha,Phosphoinositide 3 kinase,regulatory subunit 1 (alpha),PI3 kinase p85 subunit alpha,PI3-kinase regulatory subunit alpha,PI3-kinase subunit p85-alpha,PI3K,PI3K regulatory subunit alpha,Pik3r1,PtdIns 3 kinase p85 alpha,PtdIns-3-kinase regulatory subunit alpha,PtdIns-3-kinase regulatory subunit p85-alpha
Background: Phosphatidylinositol 3-kinase phosphorylates the inositol ring of phosphatidylinositol at the 3-prime position. The enzyme comprises a 110 kD catalytic subunit and a regulatory subunit of either 85, 55, or 50 kD. This gene encodes the 85 kD regulatory subunit. 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. Alternative splicing of this gene results in four transcript variants encoding different isoforms.