The Enzyme Database

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EC 2.7.1.68     
Accepted name: 1-phosphatidylinositol-4-phosphate 5-kinase
Reaction: ATP + 1-phosphatidyl-1D-myo-inositol 4-phosphate = ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate
For diagram of 1-phosphatidyl-myo-inositol metabolism (part 2), click here
Glossary: 1-phosphatidyl-1D-myo-inositol = PtdIns
1-phosphatidyl-1D-myo-inositol 3-phosphate = PtdIns3P
1-phosphatidyl-1D-myo-inositol 4-phosphate = PtdIns4P
1-phosphatidyl-1D-myo-inositol 3,4-bisphosphate = PtdIns(3,4)P2
1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate = PtdIns(4,5)P2
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
References:
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]
[EC 2.7.1.68 created 1972, modified 1980, modified 1982, modified 2002]
 
 


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