GMC oxidoreductases. A newly defined family of homologous proteins with diverse catalytic activities

Sequence comparison of Drosophila melanogaster glucose dehydrogenase, Escherichia coli choline dehydrogenase, Aspergillus niger glucose oxidase and Hansenula polymorpha methanol oxidase indicates that these four diverse flavoproteins are homologous, defining a new family of proteins named the GMC Oxidoreductases. These enzymes contain a canonical ADP-binding βαβ-fold close to their amino termini as found in other flavoenzymes. This domain is encoded by a single exon of the D. melanogaster glucose dehydrogenase gene.