Reaction: 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate + H2O = 1D-myo-inositol 1,4,5-trisphosphate + diacylglycerol
For diagram click here.
Other name(s): triphosphoinositide phosphodiesterase; phosphoinositidase C; 1-phosphatidylinositol-4,5-bisphosphate phosphodiesterase; monophosphatidylinositol phosphodiesterase; phosphatidylinositol phospholipase C; PI-PLC; 1-phosphatidyl-D-myo-inositol-4,5-bisphosphate inositoltrisphosphohydrolase
Systematic name: 1-phosphatidyl-1D-myo-inositol-4,5-bisphosphate inositoltrisphosphohydrolase
Comments: These enzymes form some of the cyclic phosphate Ins(cyclic1,2)P(4,5)P2 as well as Ins(1,4,5)P3. They show activity towards phosphatidylinositol, i.e., the activity of EC 4.6.1.13, phosphatidylinositol diacylglycerol-lyase, in vitro at high [Ca2+]. Four β-isoforms regulated by G-proteins, two γ-forms regulated by tyrosine kinases, four δ-forms regulated at least in part by calcium and an ε-form, probably regulated by the oncogene ras, have been found.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 63551-76-8
References:
1. Downes, C.P. and Michell, R.H. The polyphosphoinositide phosphodiesterase of erythrocyte membranes. Biochem. J. 198 (1981) 133-140. [PMID: 6275838]
2. Thompson, W. and Dawson, R.M.C. The triphosphoinositide phosphodiesterase of brain tissue. Biochem. J. 91 (1964) 237-243.
3. Rhee, S.G. and Bae, Y.S. Regulation of phosphoinositide-specific phospholipase C isozymes. J. Biol. Chem. 272 (1997) 15045-15048. [PMID: 9182519]