PI3Kbeta Antibody – Rabbit Polyclonal

This gene encodes an isoform of the catalytic subunit of phosphoinositide 3-kinase (PI3K). These kinases are important in signaling pathways involving receptors on the outer membrane of eukaryotic cells and are named for their catalytic subunit. The encoded protein is the catalytic subunit for PI3Kbeta (PI3KB). PI3KB has been shown to be part of the activation pathway in neutrophils which have bound immune complexes at sites of injury or infection. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2011]

PIK3CB: catalytic subunit of phosphoinositide-3-kinase beta. Catalyzes the production of phosphatidylinositol-3,4,5-triphosphate by phosphorylating phosphatidylinositol (PI), phosphatidylinositol-4-phosphate (PIP) and phosphatidylinositol-4,5-bisphosphate (PIP2). Growth factors and hormones trigger this phosphorylation event, which in turn coordinates cell growth, cell cycle entry, cell migration and cell survival. PTEN reverses this process, and the PI3K signaling pathway is constitutively activated in human cancers that have loss of function of PTEN. Expressed ubiquitously.

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

Chromosomal Location of Human Ortholog: 3q22.3

Cellular Component: plasma membrane; phosphoinositide 3-kinase complex; cytosol; nucleus

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

Biological Process: phosphoinositide 3-kinase cascade; nerve growth factor receptor signaling pathway; activation of MAPK activity; regulation of cell-matrix adhesion; chemotaxis; signal transduction; T cell receptor signaling pathway; embryonic cleavage; phosphoinositide phosphorylation; phospholipid metabolic process; positive regulation of autophagy; epidermal growth factor receptor signaling pathway; platelet activation; cell migration; phosphoinositide-mediated signaling; fibroblast growth factor receptor signaling pathway; cellular calcium ion homeostasis; G-protein coupled receptor protein signaling pathway; phosphatidylinositol biosynthetic process; insulin receptor signaling pathway; autophagy; innate immune response; vascular endothelial growth factor receptor signaling pathway; homophilic cell adhesion; blood coagulation; leukocyte migration; transmembrane receptor protein tyrosine kinase signaling pathway