Phosphatidylinositol-4,5-Bisphosphate 3-Kinase Catalytic Subunit Alpha Isoform (PIK3CA) ELISA Kit for Human

Phosphatidylinositol 3-kinase is composed of an 85 kDa regulatory subunit and a 110 kDa catalytic subunit. The protein encoded by this gene represents the catalytic subunit, which uses ATP to phosphorylate PtdIns, PtdIns4P and PtdIns(4,5)P2. This gene has been found to be oncogenic and has been implicated in cervical cancers. A pseudogene of this gene has been defined on chromosome 22. [provided by RefSeq, Apr 2016]

PIK3CA: Phosphoinositide-3-kinase (PI3K) that phosphorylates PtdIns (Phosphatidylinositol), PtdIns4P (Phosphatidylinositol 4- phosphate) and PtdIns(4,5)P2 (Phosphatidylinositol 4,5- bisphosphate) to generate phosphatidylinositol 3,4,5-trisphosphate (PIP3). PIP3 plays a key role by recruiting PH domain-containing proteins to the membrane, including AKT1 and PDPK1, activating signaling cascades involved in cell growth, survival, proliferation, motility and morphology. Participates in cellular signaling in response to various growth factors. Involved in the activation of AKT1 upon stimulation by receptor tyrosine kinases ligands such as EGF, insulin, IGF1, VEGFA and PDGF. Involved in signaling via insulin-receptor substrate (IRS) proteins. Essential in endothelial cell migration during vascular development through VEGFA signaling, possibly by regulating RhoA activity. Required for lymphatic vasculature development, possibly by binding to RAS and by activation by EGF and FGF2, but not by PDGF. Regulates invadopodia formation in breast cancer cells through the PDPK1- AKT1 pathway. Participates in cardiomyogenesis in embryonic stem cells through a AKT1 pathway. Participates in vasculogenesis in embryonic stem cells through PDK1 and protein kinase C pathway. Has also serine-protein kinase activity: phosphorylates PIK3R1 (p85alpha regulatory subunit), EIF4EBP1 and HRAS. Heterodimer of a catalytic subunit PIK3CA and a p85 regulatory subunit (PIK3R1, PIK3R2 or PIK3R3). Interacts with IRS1 in nuclear extracts. Interacts with RUFY3. Interacts with RASD2. Interacts with APPL1. Interacts with HRAS1 and KRAS. Interaction with HRAS1/KRAS is required for PI3K pathway signaling and cell proliferation stimulated by EGF and FGF2. Belongs to the PI3/PI4-kinase family.

Protein type: Carbohydrate Metabolism - inositol phosphate; EC 2.7.1.153; EC 2.7.11.1; Kinase, lipid; Motility/polarity/chemotaxis; Oncoprotein

Chromosomal Location of Human Ortholog: 3q26.32

Cellular Component: cytoplasm; cytosol; lamellipodium; phosphatidylinositol 3-kinase complex, class IA; phosphoinositide 3-kinase complex; plasma membrane

Molecular Function: 1-phosphatidylinositol-3-kinase activity; ATP binding; insulin receptor substrate binding; kinase activity; phosphatidylinositol-4,5-bisphosphate 3-kinase activity; phosphatidylinositol-4-phosphate 3-kinase activity; phosphoinositide 3-kinase activity; protein binding; protein kinase activator activity; protein serine/threonine kinase activity

Biological Process: activation of protein kinase activity; adaptive immune response; angiogenesis; anoikis; axon guidance; cardiac muscle contraction; cellular response to glucose stimulus; endothelial cell migration; epidermal growth factor receptor signaling pathway; ERBB2 signaling pathway; Fc-epsilon receptor signaling pathway; Fc-gamma receptor signaling pathway involved in phagocytosis; G-protein coupled receptor signaling pathway; glucose metabolic process; inflammatory response; innate immune response; insulin receptor signaling pathway via phosphatidylinositol 3-kinase; interleukin-7-mediated signaling pathway; leukocyte migration; liver development; negative regulation of anoikis; negative regulation of fibroblast apoptotic process; negative regulation of macroautophagy; negative regulation of neuron apoptosis; phosphatidylinositol biosynthetic process; phosphatidylinositol phosphorylation; phosphoinositide 3-kinase cascade; phosphoinositide-mediated signaling; phosphorylation; platelet activation; positive regulation of peptidyl-serine phosphorylation; positive regulation of protein kinase B signaling; positive regulation of TOR signaling pathway; protein amino acid phosphorylation; protein kinase B signaling; regulation of cellular respiration; regulation of gene expression; regulation of genetic imprinting; regulation of multicellular organism growth; T cell costimulation; T cell receptor signaling pathway; vascular endothelial growth factor receptor signaling pathway; vasculature development

Disease: Breast Cancer; Colorectal Cancer; Congenital Lipomatous Overgrowth, Vascular Malformations, And Epidermal Nevi; Cowden Syndrome 5; Gastric Cancer; Hepatocellular Carcinoma; Keratosis, Seborrheic; Lung Cancer; Megalencephaly-capillary Malformation-polymicrogyria Syndrome; Nevus, Epidermal; Ovarian Cancer