Oxidoreductases
To this group (EC 1) beIongs all enzymes catalyzing oxidation-reduction reactions. Common names include dehydrogenases, oxidazes, reductases and catalases. The substrate (AH2) that is oxidized is regarded as a hydrogen donor (AH2 + B = A + BH?). The recommended name is dehydrogenase but, as an alternative, the term reductase is used. The name ,oxidase is restricted to enzymes which exclusively use 02 as the hydrogen acceptor.