Protein ConformationComplement ActivationComplement C3Complement System ProteinsModels, MolecularComplement C4Protein BindingBinding SitesProtein Structure, TertiaryComplement C5Complement C3bReceptors, ComplementMolecular Sequence DataCrystallography, X-RayProtein Structure, SecondaryComplement C1qAmino Acid SequenceKineticsSpectrometry, FluorescenceCircular DichroismComplement Pathway, AlternativeComplement C9Complement Pathway, ClassicalComplement Membrane Attack ComplexComplement Inactivator ProteinsMolecular ConformationComplement C2Complement Factor BComplement Factor HThermodynamicsComplement Inactivating AgentsComplement C3aComplement C5aComplement C6LigandsReceptors, Complement 3bComplement C1Complement C4bHydrogen-Ion ConcentrationComplement Activating EnzymesMutationEscherichia coliComplement C3dStructure-Activity RelationshipProtein FoldingNucleic Acid ConformationComplement C3-C5 ConvertasesMutagenesis, Site-DirectedComplement Fixation TestsMagnetic Resonance SpectroscopyProtein Structure, QuaternaryModels, ChemicalRecombinant ProteinsMolecular Dynamics SimulationComplement C7TemperatureComplement C8Protein DenaturationDimerizationComplement C3cNuclear Magnetic Resonance, BiomolecularTryptophanAllosteric RegulationAdenosine TriphosphateBacterial ProteinsReceptors, Complement 3dCatalytic DomainHydrogen BondingComplement Hemolytic Activity AssayFluorescence Resonance Energy TransferAmino Acid SubstitutionHydrolysisCatalysisCysteineSpectrophotometry, UltravioletBase SequencePeptide FragmentsComplement C3b Inactivator ProteinsComplement Factor DComplement C4aFluorescenceEscherichia coli ProteinsProtein MultimerizationMagnesiumComputer SimulationTrypsinAllosteric SiteSubstrate SpecificityComplement Factor IComplement C4b-Binding ProteinSolutionsComplement C1sMacromolecular SubstancesPeptidesSequence Homology, Amino AcidAnilino NaphthalenesulfonatesCryoelectron MicroscopyStatic ElectricityNaphthalenesulfonatesDNA