Reaction catalyzed by inositol-polyphosphate multikinase (2.7.1.151)

2	ATP	+			=	2	ADP	+
	2 ATP	+		1D-myo-inositol 1,4,5-trisphosphate	=		2 ADP	+		1D-myo-inositol 1,3,4,5,6-pentakisphosphate