Catalytic DomainCatalysisBinding SitesModels, MolecularMolecular Sequence DataAmino Acid SequenceCrystallography, X-RayMutagenesis, Site-DirectedSpliceosomesKineticsProtein ConformationSubstrate SpecificityBiocatalysisEscherichia coliRibonucleoprotein, U5 Small NuclearBase SequenceSequence Homology, Amino AcidProtein Structure, TertiaryRibonucleoprotein, U4-U6 Small NuclearTriose-Phosphate IsomeraseSequence AlignmentManganeseMutationProtein BindingConserved SequenceRNA, Small NuclearNucleic Acid ConformationDeoxyribonucleases, Type II Site-SpecificStructure-Activity RelationshipOxidation-ReductionAmino Acid SubstitutionRNA SplicingHydrolysisMagnesiumRibonuclease HBacterial ProteinsOxidoreductasesSaccharomyces cerevisiaeRecombinant ProteinsGerminal CenterProtein Structure, SecondaryEndodeoxyribonucleasesCysteineModels, ChemicalAspartic AcidNucleotidesRNA PrecursorsRNA, CatalyticCrystallographyAffinity LabelsDimerizationChild Day Care CentersHydrogen-Ion ConcentrationHydrogenaseDNA-Directed RNA PolymerasesProtein SubunitsHydrogen BondingHistidineAmino Acid MotifsIntronsSaccharomyces cerevisiae ProteinsElectron Spin Resonance SpectroscopyElectron Transport Complex IVHemeCopperProtein Structure, QuaternaryMetalsPoint MutationIronDNALigandsSpectrophotometryAmino AcidsEnzyme StabilityMolecular StructureEscherichia coli ProteinsCommunity Health CentersTrauma CentersTertiary Care CentersCloning, MolecularIsoenzymesPlasmidsCircular DichroismMultienzyme ComplexesOxygenProtein FoldingMolecular WeightRNAEnzyme ActivationTemperatureLysineAdenosine TriphosphateElectrophoresis, Polyacrylamide GelDNA PrimersCattleCenters for Disease Control and Prevention (U.S.)EndopeptidasesDNA Mutational AnalysisWaterArabidopsis