Coordination ComplexesMetalsChemical EngineeringOrganometallic CompoundsPicolinic AcidsChelating AgentsZincCobaltCopperModels, MolecularMetalloproteinsBinding SitesCrystallography, X-RayCadmiumProtein ConformationElectron Spin Resonance SpectroscopyMagnetic Resonance SpectroscopyAmino Acid SequenceLigandsMolecular Sequence DataCatalysisCatalytic DomainCysteineKineticsProtein Structure, Tertiary