title: Crystallization and preliminary X-ray analysis of Aspergillus oryzae catechol oxidase.
abstract: Catechol oxidase is an enzyme that catalyzes the oxidation of o-diphenols to the corresponding o-quinones. It is a copper-containing enzyme with a binuclear copper active site. Here, the crystallization and multiple-wavelength anomalous dispersion data collection of catechol oxidase from the mould fungus Aspergillus oryzae are described. During the purification, three forms of the enzyme (39.3, 40.5 and 44.3 kDa) were obtained. A mixture of these three forms was initially crystallized and gave crystals that diffracted to 2.5 Å resolution and belonged to space group P3(2)21, with unit-cell parameters a = b = 118.9, c = 84.5 Å, α = β = 90, γ = 120°. A preparation containing only the shorter form (39.3 kDa) produced crystals that diffracted to 2.9 Å resolution and belonged to space group P2(1)2(1)2(1), with unit-cell parameters a = 51.8, b = 95.3, c = 139.5 Å, α = β = γ = 90°.
authors.affiliation: Department of Chemistry, University of Eastern Finland, Joensuu Campus, Joensuu, Finland.
authors.forename: Heidi
authors.initials: H
authors.lastname: Kaljunen
authors.forename: Chiara
authors.initials: C
authors.lastname: Gasparetti
authors.forename: Kristiina
authors.initials: K
authors.lastname: Kruus
authors.forename: Juha
authors.initials: J
authors.lastname: Rouvinen
authors.forename: Nina
authors.initials: N
authors.lastname: Hakulinen
mesh_terms: D001236:Aspergillus oryzae / Q000201:enzymology*; D004156:Catechol Oxidase / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray
chemical_list: D004156:Catechol Oxidase