I(1,3,4,6)P4 is phosphorylated to I(1,3,4,5,6)P5 by IPMK in the nucleus

In the nucleus, inositol polyphosphate multikinase (IPMK) phosphorylates inositol 1,3,4,6-tetrakisphosphate (I(1,3,4,6)P4) to inositol 1,3,4,5,6-pentakisphosphate (I(1,3,4,5,6)P5) (Chang et al. 2002, Chang & Majerus 2006).

在细胞核中，肌醇多磷酸多激酶（Inositol polyphosphate multikinase，IPMK）将肌醇1,3,4,6-四磷酸（Inositol 1,3,4,6-tetrakisphosphate，I(1,3,4,6)P4）磷酸化为肌醇1,3,4,5,6-五磷酸（Inositol 1,3,4,5,6-pentakisphosphate，I(1,3,4,5,6)P5)（Chang 等人，2002年，Chang 与 Majerus，2006年）。