Term Name:	5-diphosphoinositol pentakisphosphate 4-kinase activity
Synonyms:	diphosphoinositol-pentakisphosphate 4-kinase activity, inositol heptakisphosphate 4-kinase activity, IP7 4-kinase activity
Definition:	Catalysis of the reaction: ATP + 5-diphospho-1D-myo-inositol (1,2,3,4,6)pentakisphosphate = ADP + 4,5-bis(diphospho)-1D-myo-inositol (1,2,3,6)tetrakisphosphate.
Ontology:	GO: Molecular Function [GO:0000833]    QuickGO    AmiGO