IUBMB Enzyme Nomenclature


Accepted name: phosphatidylinositol-4,5-bisphosphate 3-kinase

Reaction: ATP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate = ADP + 1-phosphatidyl-1D-myo-inositol 3,4,5-trisphosphate

For diagram click here.

Other name(s): type I phosphoinositide 3-kinase

Systematic name: ATP:1-phosphatidyl-1D-myo-inositol-4,5-bisphosphate 3-phosphotransferase

Comments: This enzyme also catalyses the phosphorylation of PtdIns4P to PtdIns(3,4)P2, and of PtdIns to PtdIns3P. Four mammalian isoforms are known to exist.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 103843-30-7


1. Vanhaesebroeck, B., Leevers, S.J., Ahmadi, K., Timms, J., Katso, R., Driscoll, P.C., Woscholski, R., Parker, P.J. and Waterfield, M.D. Synthesis and function of 3-phosphorylated inositol lipids. Annu. Rev. Biochem. 70 (2001) 535-602. [PMID: 11395417]

[EC created 2002]

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