PIP4K2C (E7P3S) Rabbit mAb #61407

Phosphatidylinositol-5-phosphate 4-kinases (PIP4Ks) synthesize phosphatidylinositol-4,5-bisphosphate (PtdIns(4,5)P₂), a key precursor in phosphoinositide signaling that directly modulates the activity of signaling proteins and cellular processes. There are two subfamilies of PIP kinases, type I and II, that generate PtdIns(4,5)P₂ from distinct substrate pools. PIP4 type I kinases use PtdIns5P as a substrate, whereas PIP5 type II kinases use PtdIns4P (1,2). In mammalian cells, three isoforms of each PIP4K and PIP5K subfamily, encoded by distinct genes, have been characterized (3-7). All PIP kinases are stimulated by phosphatidic acid, extensively regulated by ARF and Rho GTPases, and inhibited by protein kinase A and PI-stimulated autophosphorylation (8).

PIP4K2C, also known as phosphatidylinositol-5-phosphate 4-kinase type-2 gamma (PI5P4Kγ), is a member of the type II PIP kinase family, and is broadly expressed with the highest levels in kidney and brain tissue (9). PIP4K2C can form a homodimer or heterodimer with its two other known family members, PIP4K2A and PIP4K2B (10). PIP4K2C is a regulator of mammalian target of rapamycin complex 1 (mTORC1) signaling, and Pip4k2c KO mice demonstrate enhanced immune responses and develop autoimmunity (11,12).