LigandsProtein ConformationModels, MolecularProtein BindingBinding SitesProtein Structure, TertiaryMolecular Sequence DataCrystallography, X-RayAmino Acid SequenceProtein Structure, SecondaryMolecular ConformationKineticsCircular DichroismThermodynamicsSpectrometry, FluorescenceCD40 LigandMagnetic Resonance SpectroscopyMolecular Dynamics SimulationProtein FoldingStructure-Activity RelationshipFas Ligand ProteinNuclear Magnetic Resonance, BiomolecularModels, ChemicalNucleic Acid ConformationHydrogen-Ion ConcentrationMutationRecombinant ProteinsProtein DenaturationMutagenesis, Site-DirectedTemperatureDimerizationEscherichia coliProtein Structure, QuaternaryPeptidesAllosteric RegulationComputer SimulationMolecular StructureHydrogen BondingCatalytic DomainAmino Acid SubstitutionSolutionsBase SequenceCatalysisTryptophanPeptide FragmentsProteinsFluorescence Resonance Energy TransferSpectrophotometry, UltravioletCell LineBacterial ProteinsProtein MultimerizationSignal TransductionCysteinePolymorphism, Single-Stranded ConformationalAdenosine TriphosphateSubstrate SpecificityStatic ElectricityAllosteric SiteRANK LigandSequence Homology, Amino AcidBinding, CompetitiveEpitopesDNASolventsHydrolysisMembrane GlycoproteinsAntibodies, MonoclonalCalorimetryModels, BiologicalFluorescenceMembrane ProteinsSpectroscopy, Fourier Transform InfraredHydrophobic and Hydrophilic InteractionsWaterEscherichia coli ProteinsProtein StabilityCell MembraneCattleDisulfidesMacromolecular SubstancesEntropyRecombinant Fusion ProteinsApoproteinsCarrier ProteinsCrystallographyGuanidineBiophysicsMagnesiumAnilino NaphthalenesulfonatesMotionDeuterium Exchange MeasurementSequence AlignmentFluorescent DyesCD30 LigandTNF-Related Apoptosis-Inducing LigandTrypsinAmino Acid MotifsSpectrophotometry, InfraredMutant ProteinsCryoelectron Microscopy