<unk>  (TOR or<unk> , EC 1.7.2.3) is a microbial enzyme that can reduce<unk>  N-oxide (TMAO) into<unk>  (TMA), as part of the electron transport chain. The enzyme has been purified from E. coli and the photosynthetic bacteria Roseobacter denitrificans. Both the R. denitrificans and E. coli enzymes can accept electrons from cytochromes.<unk>  + 2 (ferricytochrome c)-subunit + H2O →<unk>  N-oxide + 2 (ferrocytochrome c)-subunit + 2 H+<unk><unk>  is found at high concentrations in the tissues of fish, and the bacterial reduction of this compound to foul-smelling<unk>  is a major process in the spoilage of fish.
Trimethylamine N-oxide reductase
Formiminotransferase cyclodeaminase
Ubiquinol oxidase
Saruplase
Cytochrome P450-oxidoreductase 
Pyruvate decarboxylase
Oxoglutarate dehydrogenase
Formate dehydrogenase