In enzymology, a 1-phosphatidylinositol-3-phosphate 5-kinase is an enzyme that catalyzes the chemical reaction ATP + 1-phosphatidyl-1D-myo-inositol 3-phosphate ⇌ ADP + 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphateThus, the two substrates of this enzyme are ATP and 1-phosphatidyl-1D-myo-inositol 3-phosphate, whereas its two products are ADP and 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate. Wikipedia