Xanthine OxidaseXanthineXanthine DehydrogenaseXanthinesCrystallography, X-RayCrystallizationAllopurinolOxypurinolModels, MolecularMolybdenumHypoxanthineLiquid CrystalsHypoxanthinesProtein ConformationAldehyde OxidaseUric AcidCrystallographyBinding SitesPteridinesProtein Structure, TertiaryMolecular Sequence DataAmino Acid SequenceKetone OxidoreductasesProtein Structure, SecondaryMilkSuperoxidesFree RadicalsPurinesCatalytic DomainTungstenProtein BindingProtein Structure, QuaternaryHydrogen BondingOxidation-ReductionDimerizationKineticsSequence Homology, Amino AcidElectron Spin Resonance SpectroscopyHydroxidesCoenzymesTungsten CompoundsMolecular StructureFlavin-Adenine DinucleotideSuperoxide DismutaseMetalloproteinsSubstrate SpecificityCattleBacterial ProteinsCalcium OxalateCatalysisStructure-Activity RelationshipSequence AlignmentStructural Homology, ProteinUrate OxidaseHydroxyl RadicalTheobromineCalcium PyrophosphateMolecular ConformationOxygenEscherichia coliEnzyme InhibitorsModels, ChemicalHydrogen PeroxideNADReactive Oxygen SpeciesRecombinant ProteinsDithioniteQuartz Crystal Microbalance TechniquesCatalaseFree Radical ScavengersProtein MultimerizationLigandsStatic ElectricityNucleobase Transport ProteinsGuanine DeaminaseMutationMutagenesis, Site-DirectedPentosyltransferasesProtein FoldingFlavinsPterinsHydrogen-Ion ConcentrationOxidoreductasesAldehyde OxidoreductasesLiverSulfurPurine-Pyrimidine Metabolism, Inborn ErrorsAdenosineSpectrophotometryGoutElectronsCyclic N-OxidesOxidative StressTheophyllineIronInosineNitric OxideNADPH OxidaseEscherichia coli ProteinsChondrocalcinosis