Abstract
An acetone powder from M. phlei contains an enzyme which catalyzes the reaction: CH3.CHOH.COOH + O2 CHa.COOH + CO2 + H2O. The enzyme is specific for the oxidation of 1( + )[long dash]lactate. Anaerobically, lactate is oxidized to pyruvate. The enzyme has been obtained in soluble form. Its properties are consistent with those of an autoxidizable flavoprotein.