inositol hexakisphosphate 1-kinase activity inositol hexakisphosphate 3-kinase activity obsolete inositol hexakisphosphate 1-kinase or 3-kinase activity true molecular_function GO:0070190 OBSOLETE. Catalysis of the reaction: ATP + 1D-myo-inositol hexakisphosphate = ADP + 1-diphospho-1D-myo-inositol (2,3,4,5,6)pentakisphosphate, and ATP + 1D-myo-inositol hexakisphosphate = ADP + 3-diphospho-1D-myo-inositol (1,2,4,5,6)pentakisphosphate. This term was made obsolete because it represents two reactions, and should be two separate terms. inositol hexakisphosphate 1-kinase or 3-kinase activity