Inositol-tetrakisphosphate 1-kinase (ITPK1) phosphorylates inositol 1,3,4-trisphosphate (I(1,3,4)P3) to inositol 1,3,4,6-tetrakisphosphate (I(1,3,4,6)P4) (Wilson & Majerus 1996, Yang & Shears 2000).
Majerus, PW, Wilson, MP
Yang, X, Shears, SB
inositol-1,3,4-trisphosphate 6-kinase activity of ITPK1:Mg2+ [cytosol]
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