Glucose dehydrogenase catalyses the oxidation of D-glucose without priorphosphorylation to D-beta-gluconolactone using NAD or NADP as a coenzyme.The enzyme is a tetrameric protein, each of the 4 identical subunitscontaining 262 amino acid residues. This family is a subset of a more general family of short-chain dehydrogenases andreductases.A match to this extension indicates that the protein is notan alcohol dehydrogenase, but another type of dehydrogenaseor reductase.