PI3 Kinase Class II α (D3Q5B) Rabbit mAb #12402

Class II phosphatidylinositol 3-kinases (PI3K) contain a C-terminal C2 domain that is unique to the class II isoforms of the PI3K family. This C2 domain mediates protein and phospholipid binding acitivities (1,2). PI3K Class II α generates phosphatidylinositol 3-phosphate (PIP3) and phosphatidylinositol 3,4-bisphosphate (PI(3, 4)P2) from phosphatidylinositol and phosphatidylinositol 4-phosphate (3). PI3K Class II α is located in various intracellular locations such as the trans-Golgi network, endocytic compartments, clathrin-coated vesicles, and nuclear speckles (1,4,5). Research studies have indicated that PI3K Class II α regulates the assembly and distribution of clathrin, resulting in the modulation of clathrin-dependent trafficking and sorting within the trans Golgi network (5,6). PI3K Class II α also mediates translocation of the glucose transporter GLUT4 to the plasma membrane in response to insulin (7). PI3K Class II α has also been shown to regulate neurosecretory granule exocytosis (8) and vascular smooth muscle contraction (9). Unlike other PI3K family members, PI3K Class II α is less sensitive to the PI3K inhibitors wortmannin and LY294002 (3).