title: The pyrroloquinoline quinone (PQQ) coenzymes: a case of mistaken identity.
abstract: Recent evidence has failed to support the claim for a pyrroloquinoline quinone (PQQ) cofactor in mammalian enzymes previously reported to have PQQ. The validity of the original analysis now has been questioned, and a second cofactor, topa quinone, has been identified in at least one enzyme.
authors.affiliation: Department of Biochemistry and Biophysics, Texas A & M University, College Station 77843-2128.
authors.forename: E D
authors.initials: ED
authors.lastname: Harris
mesh_terms: D000818:Animals; D003067:Coenzymes / Q000737:chemistry / Q000378:metabolism; D004295:Dihydroxyphenylalanine / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism; D015394:Molecular Structure; D045542:PQQ Cofactor; D015363:Quinolones / Q000737:chemistry / Q000378:metabolism
chemical_list: D003067:Coenzymes; D015363:Quinolones; D004295:Dihydroxyphenylalanine; C067626:6-hydroxydopa quinone; D045542:PQQ Cofactor