Summary: Methyl mercaptan (MM)-oxidase was purified to near homogeneity from TK-m grown on dimethyl sulphide. The enzyme was a monomer with an value of approximately 40000. It oxidized MM stoichiometrically to formaldehyde, S and HO. The enzyme had a of 31·3 μM for MM. It was also shown to oxidize ethyl mercaptan. MM-oxidase from was shown to have some different characteristics from MM-oxidase of EG, such as a higher , the absence of inhibition by S and the inability to catalyse the oxidation of S.


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