Aliases for PIK3R5 Gene
External Ids for PIK3R5 Gene
Phosphatidylinositol 3-kinases (PI3Ks) phosphorylate the inositol ring of phosphatidylinositol at the 3-prime position, and play important roles in cell growth, proliferation, differentiation, motility, survival and intracellular trafficking. The PI3Ks are divided into three classes: I, II and III, and only the class I PI3Ks are involved in oncogenesis. This gene encodes the 101 kD regulatory subunit of the class I PI3K gamma complex, which is a dimeric enzyme, consisting of a 110 kD catalytic subunit gamma and a regulatory subunit of either 55, 87 or 101 kD. This protein recruits the catalytic subunit from the cytosol to the plasma membrane through high-affinity interaction with G-beta-gamma proteins. Multiple alternatively spliced transcript variants encoding two distinct isoforms have been found. [provided by RefSeq, Oct 2011]
GeneCards Summary for PIK3R5 Gene
PIK3R5 (Phosphoinositide-3-Kinase, Regulatory Subunit 5) is a Protein Coding gene. Diseases associated with PIK3R5 include ataxia-oculomotor apraxia 3 and ataxia-ocular apraxia-2. Among its related pathways are PI3K-Akt signaling pathway and Glioma. GO annotations related to this gene include G-protein beta/gamma-subunit complex binding and 1-phosphatidylinositol-3-kinase regulator activity.
UniProtKB/Swiss-Prot for PIK3R5 Gene
Regulatory subunit of the PI3K gamma complex. Required for recruitment of the catalytic subunit to the plasma membrane via interaction with beta-gamma G protein dimers. Required for G protein-mediated activation of PIK3CG (By similarity).
PI 3-Kinases (phosphoinositide 3-kinases, PI3Ks) are family of lipid kinases capable of phosphorylating the 3OH of the inositol ring of phosphoinositides. They are responsible for coordinating a diverse range of cell functions including proliferation, cell survival, degranulation, vesicular trafficking and cell migration. The PI 3-kinases are grouped into three distinct classes. Class I PI 3-kinases are heteromeric consisting of a regulatory subunit and a 110 kDA catalytic subunits (3 forms in class 1A : alpha-, beta- and delta- and one in class 1B : gamma-). PI 3-kinases p110 alpha- and beta- are ubiquitously expressed whilst p110 delta- expression is associated with leukocytes. Activating mutations in the p110alpha- subunit have recently been discovered in certain types of cancer cell. Class II PI 3-kinases are large homomeric enzymes (C2alpha-, beta- and gamma-) that are sensitive to wortmannin (although less sensitive than Class 1 PI 3-kinases) but are resistant to LY 292002. Class III contains just one member, hVps34p, which is thought to play an important role in both protein sorting and nutrient sensing in concert with the mTOR pathway.