title: Escherichia coli PQQ-containing quinoprotein glucose dehydrogenase: its structure comparison with other quinoproteins.
abstract: Membrane-bound glucose dehydrogenase (mGDH) in Escherichia coli is one of the pivotal pyrroloquinoline quinone (PQQ)-containing quinoproteins coupled with the respiratory chain in the periplasmic oxidation of alcohols and sugars in Gram-negative bacteria. We compared mGDH with other PQQ-dependent quinoproteins in molecular structure and attempted to trace their evolutionary process. We also review the role of residues crucial for the catalytic reaction or for interacting with PQQ and discuss the functions of two distinct domains, radical formation in PQQ, and the presumed existence of bound quinone in mGDH.
authors.affiliation: Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan. yamada@agr.yamaguchi-u.ac.jp
authors.forename: Mamoru
authors.initials: M
authors.lastname: Yamada
authors.forename: M D
authors.initials: MD
authors.lastname: Elias
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Matsushita
authors.forename: Catharina T
authors.initials: CT
authors.lastname: Migita
authors.forename: Osao
authors.initials: O
authors.lastname: Adachi
mesh_terms: D001665:Binding Sites; D004926:Escherichia coli / Q000201:enzymology*; D029968:Escherichia coli Proteins / Q000737:chemistry*; D005948:Glucose Dehydrogenases / Q000737:chemistry*; D008958:Models, Molecular; D045542:PQQ Cofactor; D021122:Protein Subunits; D015363:Quinolones / Q000737:chemistry; D011809:Quinones / Q000737:chemistry
chemical_list: D029968:Escherichia coli Proteins; D021122:Protein Subunits; D015363:Quinolones; D011809:Quinones; D045542:PQQ Cofactor; D005948:Glucose Dehydrogenases; C033955:glucose dehydrogenase (pyrroloquinoline-quinone)