The Enzyme Database

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EC 1.14.99.3     
Accepted name: heme oxygenase (biliverdin-producing)
Reaction: protoheme + 3 AH2 + 3 O2 = biliverdin + Fe2+ + CO + 3 A + 3 H2O
For diagram of the reaction mechanism, click here
Other name(s): ORP33 proteins; haem oxygenase (ambiguous); heme oxygenase (decyclizing) (ambiguous); heme oxidase (ambiguous); haem oxidase (ambiguous); heme oxygenase (ambiguous); heme,hydrogen-donor:oxygen oxidoreductase (α-methene-oxidizing, hydroxylating)
Systematic name: protoheme,hydrogen-donor:oxygen oxidoreductase (α-methene-oxidizing, hydroxylating)
Comments: Requires NAD(P)H and EC 1.6.2.4, NADPH—hemoprotein reductase. The terminal oxygen atoms that are incorporated into the carbonyl groups of pyrrole rings A and B of biliverdin are derived from two separate oxygen molecules [4]. The third oxygen molecule provides the oxygen atom that converts the α-carbon to CO. The central iron is kept in the reduced state by NAD(P)H.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9059-22-7
References:
1.  Maines, M.D., Ibrahim, N.G. and Kappas, K. Solubilization and partial purification of heme oxygenase from rat liver. J. Biol. Chem. 252 (1977) 5900–5903. [PMID: 18477]
2.  Sunderman, F.W., Jr., Downs, J.R., Reid, M.C. and Bibeau, L.M. Gas-chromatographic assay for heme oxygenase activity. Clin. Chem. 28 (1982) 2026–2032. [PMID: 6897023]
3.  Yoshida, T., Takahashi, S. and Kikuchi, J. Partial purification and reconstitution of the heme oxygenase system from pig spleen microsomes. J. Biochem. (Tokyo) 75 (1974) 1187–1191. [PMID: 4370250]
4.  Noguchi, M., Yoshida, T. and Kikuchi, G. Specific requirement of NADPH-cytochrome c reductase for the microsomal heme oxygenase reaction yielding biliverdin IX α. FEBS Lett. 98 (1979) 281–284. [PMID: 105935]
5.  Lad, L., Schuller, D.J., Shimizu, H., Friedman, J., Li, H., Ortiz de Montellano, P.R. and Poulos, T.L. Comparison of the heme-free and -bound crystal structures of human heme oxygenase-1. J. Biol. Chem. 278 (2003) 7834–7843. [PMID: 12500973]
[EC 1.14.99.3 created 1972, modified 2006]
 
 


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