InterPro domain: IPR002372

Pyrrolo-quinoline quinone (PQQ) is a redox coenzyme, which serves as a cofactor for a number of enzymes (quinoproteins) and particularly for some bacterial dehydrogenases [ 1 , 2 , 3 ]. A number of bacterial quinoproteins belong to this family.

Enzymes in this group have repeats of a beta propeller.

1. Quinoproteins, enzymes with pyrrolo-quinoline quinone as cofactor. Annu. Rev. Biochem. 58, 403-26
2. PQQ, the elusive coenzyme. Trends Biochem. Sci. 14, 343-6
3. A tightly bound quinone functions in the ubiquinone reaction sites of quinoprotein alcohol dehydrogenase of an acetic acid bacterium, Gluconobacter suboxydans. Biosci. Biotechnol. Biochem. 72, 2723-31