IUBMB Enzyme Nomenclature


Accepted name: phosphatidylinositol-4,5-bisphosphate 4-phosphatase

Reaction: 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate + H2O = 1-phosphatidyl-1D-myo-inositol 5-phosphate + phosphate

Other name(s): phosphatidylinositol-4,5-bisphosphate 4-phosphatase I; phosphatidylinositol-4,5-bisphosphate 4-phosphatase II; type I PtdIns-4,5-P2 4-Ptase; type II PtdIns-4,5-P2 4-Ptase; IpgD; PtdIns-4,5-P2 4-phosphatase type I; PtdIns-4,5-P2 4-phosphatase type II; type I phosphatidylinositol-4,5-bisphosphate 4-phosphatase; type 1 4-phosphatase

Systematic name: 1-phosphatidyl-1D-myo-inositol-4,5-bisphosphate 4-phosphohydrolase

Comments: Two pathways exist in mammalian cells to degrade 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate [PtdIns(4,5)P2] [2]. One is catalysed by this enzyme and the other by EC, phosphoinositide 5-phosphatase, where the product is PtdIns4P. The enzyme from human is specific for PtdIns(4,5)P2 as substrate, as it cannot use PtdIns(3,4,5)P3, PtdIns(3,4)P2, PtdIns(3,5)P2, PtdIns5P, PtdIns4P or PtdIns3P [2]. In humans, the enzyme is localized to late endosomal/lysosomal membranes [2]. It can control nuclear levels of PtdIns5P and thereby control p53-dependent apoptosis [3].

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Niebuhr, K., Giuriato, S., Pedron, T., Philpott, D.J., Gaits, F., Sable, J., Sheetz, M.P., Parsot, C., Sansonetti, P.J. and Payrastre, B. Conversion of PtdIns(4,5)P2 into PtdIns(5)P by the S. flexneri effector IpgD reorganizes host cell morphology. EMBO J. 21 (2002) 5069-5078. [PMID: 12356723]

2. Ungewickell, A., Hugge, C., Kisseleva, M., Chang, S.C., Zou, J., Feng, Y., Galyov, E.E., Wilson, M. and Majerus, P.W. The identification and characterization of two phosphatidylinositol-4,5-bisphosphate 4-phosphatases. Proc. Natl. Acad. Sci. USA 102 (2005) 18854-18859. [PMID: 16365287]

3. Zou, J., Marjanovic, J., Kisseleva, M.V., Wilson, M. and Majerus, P.W. Type I phosphatidylinositol-4,5-bisphosphate 4-phosphatase regulates stress-induced apoptosis. Proc. Natl. Acad. Sci. USA 104 (2007) 16834-16839. [PMID: 17940011]

4. Mason, D., Mallo, G.V., Terebiznik, M.R., Payrastre, B., Finlay, B.B., Brumell, J.H., Rameh, L. and Grinstein, S. Alteration of epithelial structure and function associated with PtdIns(4,5)P2 degradation by a bacterial phosphatase. J. Gen. Physiol. 129 (2007) 267-283. [PMID: 17389247]

[EC created 2008]

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