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