ID   2.7.4.21
DE   inositol-hexakisphosphate 5-kinase.
AN   inositol-hexakisphosphate kinase.
AN   IP6K.
CA   (1) 1D-myo-inositol hexakisphosphate + ATP = 5-diphospho-1D-myo-inositol
CA   1,2,3,4,6-pentakisphosphate + ADP.
CA   (2) 1-diphospho-1D-myo-inositol 2,3,4,5,6-pentakisphosphate + ATP + H(+)
CA   = 1,5-bis(diphospho)-1D-myo-inositol 2,3,4,6-tetrakisphosphate + ADP.
CC   -!- Three mammalian isoforms are known to exist.
CC   -!- Formerly EC 2.7.1.152.
DR   Q92551, IP6K1_HUMAN;  Q6PD10, IP6K1_MOUSE;  Q9ESM0, IP6K1_RAT  ;
DR   Q96PC2, IP6K3_HUMAN;  Q8BWD2, IP6K3_MOUSE;  Q84Y01, ITPK1_MAIZE;
DR   A7X657, ITPK1_SOYBN;  A7X665, ITPK2_SOYBN;  Q12494, KCS1_YEAST ;
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