Description
Product Characteristics:
The enzyme phosphatidylinositol 3 kinase (PI3 kinase) is a lipid kinase that generates phosphatidylinositol 3, 4, 5-triphosphate in response to receptor activation in many signal transduction pathways. Class IA PI3Ks exist as a heterodimer of a catalytic 110 kDa (p110) and a regulatory p85 subunit (e.g. p85 alpha). p85 alpha is an adaptor molecule that regulates the activity of the catalytic p110 subunit by binding to phosphorylated receptor tyrosine kinases (RTKs) through its SH2 domain and mediating the interaction between p110 and the plasma membrane. p85 alpha is necessary for insulin-stimulated increase in glucose uptake and glycogen synthesis in insulin-sensitive tissues.
Subcellular location: Cytoplasm, Cell membrane
Synonyms: PIK3R1phospho Y467, GRB1, p50 alpha, p55 alpha, p85 alpha, p85, Phosphatidylinositol 3 kinase associated p85 alpha, Phosphatidylinositol 3 kinase regulatory 1, Phosphatidylinositol 3 kinase regulatory alpha subunit, Phosphoinositide 3 kinase regulatory subunit polypeptide 1 p85 alpha, PI3 kinase p85 alpha subunit, PI3 kinase p85 subunit alpha, PI3K, PIK3R1, PtdIns 3 kinase p85 alpha.
Target Information: 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. [provided by RefSeq, Jun 2011]