DimerizationLigandsProtein MultimerizationMolecular Sequence DataProtein Structure, TertiaryProtein BindingAmino Acid SequenceModels, MolecularBinding SitesProtein Structure, QuaternaryCD40 LigandProtein ConformationCrystallography, X-RayFas Ligand ProteinCell LineMutationRecombinant Fusion ProteinsBase SequenceProtein Structure, SecondaryMutagenesis, Site-DirectedSignal TransductionRecombinant ProteinsLeucine ZippersDNA-Binding ProteinsKineticsSequence Homology, Amino AcidStructure-Activity RelationshipAmino Acid SubstitutionTranscription FactorsCOS CellsTransfectionBiopolymersCross-Linking ReagentsAmino Acid MotifsMacromolecular SubstancesCysteineRANK LigandDNAPhosphorylationProtein Interaction Domains and MotifsDisulfidesMembrane GlycoproteinsSequence AlignmentCHO CellsMembrane ProteinsEscherichia coliProtein FoldingCircular DichroismFluorescence Resonance Energy TransferUltracentrifugationThermodynamicsCricetinaeCells, CulturedPeptidesBacterial ProteinsCell MembraneModels, BiologicalMutagenesisSequence DeletionBinding, CompetitiveCarrier ProteinsMolecular StructurePeptide FragmentsPoint MutationHEK293 CellsMutant ProteinsEnzyme ActivationCD30 LigandReceptors, Cell SurfaceTNF-Related Apoptosis-Inducing LigandNucleic Acid ConformationCloning, MolecularChromatography, GelDNA PrimersMagnetic Resonance SpectroscopyElectrophoresis, Polyacrylamide GelCatalysisConserved SequenceTranscriptional ActivationHelix-Loop-Helix MotifsRepressor ProteinsCercopithecus aethiopsCatalytic DomainMolecular ConformationTranscription, GeneticNuclear Magnetic Resonance, BiomolecularTwo-Hybrid System TechniquesTrans-ActivatorsModels, ChemicalPlasmidsOX40 LigandRNA, ViralSpectrometry, FluorescenceGlycophorinCell Line, TumorReceptor, Epidermal Growth FactorHydrophobic and Hydrophilic InteractionsCricetulusHIV-1HeLa Cells