Acireductone Dioxygenase [Iron(II)-Requiring] Activity
1,2-Dihydroxy-5-(methylthio)pent-1-en-3-One:oxygen Oxidoreductase (Formate-Forming)
Catalysis of the reaction: 1,2-dihydroxy-5-(methylthio)pent-1-en-3-one + O(2) = 4-methylthio-2-oxobutanoate + formate + H(+).