EC number 1.14.13.148 Human Mouse | Species Human Entrez 2328 | |
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Aliases FMO3, trimethylamine monooxygenase, flavin-containing monooxygenase 3, Dimethylaniline monooxygenase [N-oxide-forming] 3, FMOII, TMAU, dJ127D3.1, flavin containing monooxygenase 3 External IDs OMIM: 136132 MGI: 1100496 HomoloGene: 128199 GeneCards: FMO3 | ||
Flavin-containing monooxygenase 3 (FMO3), also known as dimethylaniline monooxygenase [N-oxide-forming] 3 and trimethylamine monooxygenase, is a flavoprotein enzyme (EC 1.14.13.148) that in humans is encoded by the FMO3 gene. This enzyme catalyzes the following chemical reaction:
FMO3 is the main flavin-containing monooxygenase isoenzyme that is expressed in the liver of adult humans. The human FMO3 enzyme catalyzes several types of reactions, including: the N-oxygenation of primary, secondary, and tertiary amines; the S-oxygenation of nucleophilic sulfur-containing compounds; and the 6-methylhydroxylation of DMXAA.
FMO3 is the primary enzyme in humans which catalyzes the N-oxidation of trimethylamine into trimethylamine N-oxide; FMO1 also N-oxygenates trimethylamine, but to a much lesser extent than FMO3. Genetic deficiencies of the FMO3 enzyme cause primary trimethylaminuria, also known as "fish odor syndrome". FMO3 is also involved in the metabolism of many xenobiotics (i.e., exogenous compounds which are not normally present in the body), such as the oxidative deamination of amphetamine.