IUBMB Enzyme Nomenclature


Accepted name: monoamine oxidase

Reaction: RCH2NHR' + H2O + O2 = RCHO + R'NH2 + H2O2

Other name(s): adrenalin oxidase; adrenaline oxidase; amine oxidase (ambiguous); amine oxidase (flavin-containing); amine:oxygen oxidoreductase (deaminating) (flavin-containing); epinephrine oxidase; MAO; MAO A; MAO B; MAO-A; MAO-B; monoamine oxidase A; monoamine oxidase B; monoamine:O2 oxidoreductase (deaminating); polyamine oxidase (ambiguous); serotonin deaminase; spermidine oxidase (ambiguous); spermine oxidase (ambiguous); tyraminase; tyramine oxidase

Systematic name: amine:oxygen oxidoreductase (deaminating)

Comments: A mitochondrial outer-membrane flavoprotein (FAD) that catalyses the oxidative deamination of neurotransmitters and biogenic amines [3]. Acts on primary amines, and also on some secondary and tertiary amines. It differs from EC, primary-amine oxidase as it can oxidize secondary and tertiary amines but not methylamine. This enzyme is inhibited by acetylenic compounds such as chlorgyline, 1-deprenyl and pargyline but, unlike EC and EC (diamine oxidase), it is not inhibited by semicarbazide.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, UM-BBD , CAS registry number: 9001-66-5


1. Blaschko, H. Amine oxidase. In: Boyer, P.D., Lardy, H. and Myrbäck, K. (Eds), The Enzymes, 2nd edn, vol. 8, Academic Press, New York, 1963, pp. 337-351.

2. Dostert, P.L., Strolin Benedetti, M. and Tipton, K.F. Interactions of monoamine oxidase with substrates and inhibitors. Med. Res. Rev. 9 (1989) 45-89. [PMID: 2644497]

3. Edmondson, D.E., Mattevi, A., Binda, C., Li, M. and Hubálek, F. Structure and mechanism of monoamine oxidase. Curr. Med. Chem. 11 (2004) 1983-1993. [PMID: 15279562]

4. Shih, J.C. and Chen, K. Regulation of MAO-A and MAO-B gene expression. Curr. Med. Chem. 11 (2004) 1995-2005. [PMID: 15279563]

5. Tipton, K.F., Boyce, S., O'Sullivan, J., Davey, G.P. and Healy, J. Monoamine oxidases: certainties and uncertainties. Curr. Med. Chem. 11 (2004) 1965-1982. [PMID: 15279561]

6. De Colibus, L., Li, M., Binda, C., Lustig, A., Edmondson, D.E. and Mattevi, A. Three-dimensional structure of human monoamine oxidase A (MAO A): relation to the structures of rat MAO A and human MAO B. Proc. Natl. Acad. Sci. USA 102 (2005) 12684-12689. [PMID: 16129825]

7. Youdim, M.B., Edmondson, D. and Tipton, K.F. The therapeutic potential of monoamine oxidase inhibitors. Nat. Rev. Neurosci. 7 (2006) 295-309. [PMID: 16552415]

8. Youdim, M.B. and Bakhle, Y.S. Monoamine oxidase: isoforms and inhibitors in Parkinson's disease and depressive illness. Br. J. Pharmacol. 147 Suppl. 1 (2006) S287-S296. [PMID: 16402116]

[EC created 1961, modified 1983 (EC created 1972, incorporated 1984), modified 2008]

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