. "Activated by osmotic shock." . "Can also phosphorylate InsP(6), but more slowly." . "Ins(1,3,4,5,6)P(5), POP-InsP(4) and (POP)2-InsP(3) are not substrates." . . . "Diphosphoinositol-pentakisphosphate kinase" . "Diphosphoinositol pentakisphosphate kinase" . "PP-IP(5) kinase" . . "ATP + 1D-myo-inositol 5-diphosphate pentakisphosphate = ADP + 1D-myo-inositol bisdiphosphate tetrakisphosphate (isomeric configuration unknown)." .