Generates phosphatidylinositol 3-phosphate (PtdIns3P) and phosphatidylinositol 3,4-bisphosphate (PtdIns(3,4)P2) that act as second messengers. May play a role in SDF1A-stimulated chemotaxis. Belongs to the PI3/PI4-kinase family. Highly expressed in liver, prostate and testis. Lower levels in small intestine, kidney and pancreas. Note: This description may include information from UniProtKB.