inositol hexakisphosphate 4-kinase activity
Catalysis of the reaction: ATP + 1D-myo-inositol hexakisphosphate = ADP + 4-diphospho-1D-myo-inositol (1,2,3,5,6)pentakisphosphate.
GO:0000828
inositol hexakisphosphate kinase activity
is_a