Reaction: ATP + 1-phosphatidyl-1D-myo-inositol 4-phosphate = ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate
For diagram click here.
Other name(s): diphosphoinositide kinase; PIP kinase; phosphatidylinositol 4-phosphate kinase; phosphatidylinositol-4-phosphate 5-kinase; type I PIP kinase
Systematic name: ATP:1-phosphatidyl-1D-myo-inositol-4-phosphate 5-phosphotransferase
Comments: This enzyme can also phosphorylate PtdIns3P in the 4-position, and PtdIns, PtdIns3P and PtdIns(3,4)P2 in the 5-position in vitro, but to a lesser extent. The last of these reactions occurs in vivo and is physiologically relevant. Three different isoforms are known.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 104645-76-3
1. Kai, M., Salway, J.G. and Hawthorne, J.N. The diphosphoinositide kinase of rat brain. Biochem. J. 106 (1968) 791-801. [PMID: 4295336]
2. Kai, M., Salway, J.G., Michell, R.H. and Hawthorne, J.N. The biosynthesis of triphosphoinositide by rat brain in vitro. Biochem. Biophys. Res. Commun. 22 (1966) 370-375.
3. Rameh, L.E., Tolias, K.F., Duckworth, B.C. and Cantley, L.C. A new pathway for synthesis of phosphatidylinositol-4,5-bisphosphate. Nature 390 (1997) 192-196. [PMID: 9367159]