Dimethyl-sulfide monooxygenase (EC 1.14.13.131, dimethylsulfide monooxygenase) is an enzyme with systematic name dimethyl sulfide,NADH:oxygen oxidoreductase. This enzyme catalyses the following chemical reactiondimethyl sulfide + O2 + NADH + H+ methanethiol + formaldehyde + NAD+ + H2O