ExplorEnz: EC 2.7.1.68

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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]