IUBMB Enzyme Nomenclature


Accepted name: 4-methylaminobutanoate oxidase (formaldehyde-forming)

Reaction: 4-methylaminobutanoate + O2 + H2O = 4-aminobutanoate + formaldehyde + H2O2

For diagram of reaction click here.

Other name(s): mabO (gene name)

Systematic name: 4-methylaminobutanoate:oxygen oxidoreductase (formaldehyde-forming)

Comments: A flavoprotein (FAD). In the enzyme from the soil bacterium Arthrobacter nicotinovorans the cofactor is covalently bound. Participates in the nicotine degradation pathway of this organism.

Links to other databases: BRENDA, EAWAG-BBD, EXPASY, KEGG, Metacyc, CAS registry number:


1. Chiribau, C.B., Sandu, C., Fraaije, M., Schiltz, E. and Brandsch, R. A novel γ-N-methylaminobutyrate demethylating oxidase involved in catabolism of the tobacco alkaloid nicotine by Arthrobacter nicotinovorans pAO1. Eur. J. Biochem. 271 (2004) 4677-4684. [PMID: 15606755]

[EC created 2012]

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