Accepted name: inositol-polyphosphate 5-phosphatase
Reaction: (1) D-myo-inositol 1,4,5-trisphosphate + H2O = myo-inositol 1,4-bisphosphate + phosphate
(2) 1D-myo-inositol 1,3,4,5-tetrakisphosphate + H2O = 1D-myo-inositol 1,3,4-trisphosphate + phosphate
Other name(s): type I inositol-polyphosphate phosphatase; inositol trisphosphate phosphomonoesterase; InsP3/Ins(1,3,4,5)P4 5-phosphatase; inosine triphosphatase; D-myo-inositol 1,4,5-triphosphate 5-phosphatase; D-myo-inositol 1,4,5-trisphosphate 5-phosphatase; L-myo-inositol 1,4,5-trisphosphate-monoesterase; inositol phosphate 5-phosphomonoesterase; inositol-1,4,5-trisphosphate/1,3,4,5-tetrakisphosphate 5-phosphatase; Ins(1,4,5)P3 5-phosphatase; D-myo-inositol(1,4,5)/(1,3,4,5)-polyphosphate 5-phosphatase; inositol 1,4,5-trisphosphate phosphatase; inositol polyphosphate-5-phosphatase; myo-inositol-1,4,5-trisphosphate 5-phosphatase; inositol-1,4,5-trisphosphate 5-phosphatase
Systematic name: 1D-myo-inositol-1,4,5-trisphosphate 5-phosphohydrolase
Comments: One mammalian isoform is known. This enzyme is distinguished from the family of enzymes classified under EC, phosphoinositide 5-phosphatase, by its inability to dephosphorylate inositol lipids.
1.  Downes, C.P., Mussat, M.C. and Michell, R.H. The inositol trisphosphate phosphomonoesterase of the human erythrocyte membrane. Biochem. J. 203 (1982) 169–177. [PMID: 6285891]
2.  Erneux, C., Lemos, M., Verjans, B., Vanderhaeghen, P., Delvaux, A. and Dumont, J.E. Soluble and particulate Ins(1,4,5)P3/Ins(1,3,4,5)P4 5-phosphatase in bovine brain. Eur. J. Biochem. 181 (1989) 317–322. [PMID: 2540972]
3.  Woscholski, R. and Parker, P.J. Inositol phosphatases: constructive destruction of phosphoinositides and inositol phosphates. In: Cockcroft, S. (Ed.), Biology of Phosphoinositides, Biology of Phosphoinositides, Oxford, 2000, pp. 320–338.
4.  Verjans, B., De Smedt, F., Lecocq, R., Vanweyenberg, V., Moreau, C. and Erneux, C. Cloning and expression in Escherichia coli of a dog thyroid cDNA encoding a novel inositol 1,4,5-trisphosphate 5-phosphatase. Biochem. J. 300 (1994) 85–90. [PMID: 8198557]
[EC created 1989, modified 2002]

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