title: Mutations at Asp112 adjacent to the trinuclear Cu center in CueO as the proton donor in the four-electron reduction of dioxygen.
abstract: Asp112 adjacent to the trinuclear Cu center of a multicopper oxidase, CueO was mutated for Glu, Ala and Asn. Mutations on Asp112 affected not only spectroscopic and magnetic properties derived from the trinuclear Cu center but also enzyme activities. The uncoordinated Asp112 was found to play multiple roles to promote the binding of dioxygen at the trinuclear Cu center and to accelerate the conversion of dioxygen to water molecules by facilitating the supply of H+ to the reaction intermediates.
authors.affiliation: Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
authors.forename: Yusaku
authors.initials: Y
authors.lastname: Ueki
authors.forename: Megumi
authors.initials: M
authors.lastname: Inoue
authors.forename: Shinji
authors.initials: S
authors.lastname: Kurose
authors.forename: Kunishige
authors.initials: K
authors.lastname: Kataoka
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sakurai
mesh_terms: D001224:Aspartic Acid / Q000737:chemistry* / Q000235:genetics; D001665:Binding Sites / Q000235:genetics; D002942:Circular Dichroism; D003300:Copper / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D029968:Escherichia coli Proteins / Q000737:chemistry* / Q000235:genetics; D009154:Mutation; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000737:chemistry* / Q000235:genetics; D010100:Oxygen / Q000737:chemistry*
chemical_list: D029968:Escherichia coli Proteins; D001224:Aspartic Acid; D003300:Copper; D010088:Oxidoreductases; C499679:cueO protein, E coli; D010100:Oxygen