. "Catalysis of the reaction: (S)-malate + a quinone = oxaloacetate + a quinol." . . . "malate dehydrogenase (quinone) activity" . "(S)-malate:(quinone) oxidoreductase activity" . "(S)-malate:quinone oxidoreductase activity" . "FAD-dependent malate dehydrogenase activity" . "MQO activity" . . .