Inositol monophosphatase 1 (IMPA1) and 2 (IMPA2) homodimers dephosphorylate inositol 4-phosphate (I4P) to inositol (Ins). In vitro, IMPA1 and 2 differ in their pH optima and IMPA1 has a significantly greater activity on IP4 than does IMPA2 (Ohnishi et al. 2007).
Seo, KC, Sato, Y, Ohba, H, Ohnishi, T, Chung, SK, Furuichi, T, Im, J, Yoshikawa, T, Iwayama, Y
inositol monophosphate 4-phosphatase activity of IMPA1/2 [cytosol]
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