PIK3C3 is a symbol for the gene, Phosphatidylinositol 3-kinase catalytic subunit type 3, in humans. Other names include: PI3-kinase type 3; PI3K type 3; PtdIns-3-kinase type 3; Phosphatidylinositol 3-kinase p100 subunit; Phosphoinositide-3-kinase class 3; hVps34; VPS34; phosphatidylinositol 3-kinase, catalytic subunit type 3. The encoded protein is an enzyme with an amino acid length of 887 and a mass of 101.5 kDa. PIK3C3 is a member of the PI3/PI4-kinase family. This gene shares homology with other species, including: Fly, Yeast, Arabidopsis.