Binds 1 [4Fe-4S] cluster. Binds 1 molybdenum-bis(molybdopterin guanine dinucleotide) (Mo-bis-MGD) cofactor per subunit. Up-regulated in response to dopamine. Predicted to be exported by the Tat system. The position of the signal peptide cleavage has not been experimentally proven. E.lenta strain ATCC 25559 / DSM 2243 is not able to dehydroxylate dopamine, likely due to the presence of a serine residue in position 506 in this protein, instead of an arginine residue in dopamine metabolizing strains. Belongs to the prokaryotic molybdopterin-containing oxidoreductase family.