Phosphoinositide 3-Kinase Regulatory Subunit 6 (PIK3R6) ELISA Kit for Human

Phosphoinositide 3-kinase gamma is a lipid kinase that produces the lipid second messenger phosphatidylinositol 3,4,5-trisphosphate. The kinase is composed of a catalytic subunit and one of several regulatory subunits, and is chiefly activated by G protein-coupled receptors. This gene encodes a regulatory subunit, and is distantly related to the phosphoinositide-3-kinase, regulatory subunit 5 gene which is located adjacent to this gene on chromosome 7. The orthologous protein in the mouse binds to both the catalytic subunit and to G(beta/gamma), and mediates activation of the kinase subunit downstream of G protein-coupled receptors. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2014]

PIK3R6: Regulatory subunit of the PI3K gamma complex. Acts as an adapter to drive activation of PIK3CG by beta-gamma G protein dimers. The PIK3CG:PIK3R6 heterodimer is much less sensitive to beta-gamma G protein dimers than PIK3CG:PIK3R5 and its membrane recruitment and beta-gamma G protein dimer-dependent activation requires HRAS1 bound to PIK3CG. Recruits of the PI3K gamma complex to a PDE3B:RAPGEF3 signaling complex involved in angiogenesis; signaling seems to involve RRAS.

Chromosomal Location of Human Ortholog: 17p13.1

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

Molecular Function: 1-phosphatidylinositol-3-kinase regulator activity; phosphatidylinositol-4,5-bisphosphate 3-kinase activity; protein binding

Biological Process: angiogenesis; G-protein coupled receptor signaling pathway; phosphatidylinositol biosynthetic process; phosphatidylinositol phosphorylation; phosphoinositide 3-kinase cascade; platelet activation; positive regulation of angiogenesis; positive regulation of MAP kinase activity; positive regulation of T cell differentiation; regulation of natural killer cell mediated cytotoxicity; regulation of phosphoinositide 3-kinase activity