Anilino NaphthalenesulfonatesBinding SitesHydrophobic and Hydrophilic InteractionsProtein BindingFicainModels, MolecularProtein ConformationMolecular Sequence DataSpectrometry, FluorescenceAmino Acid SequenceStructure-Activity RelationshipCrystallography, X-RayKineticsProtein Structure, TertiaryMolecular StructureProtein Structure, SecondaryLigandsFluorescent DyesCircular DichroismThermodynamicsCattleSubstrate SpecificityBase SequencePromoter Regions, GeneticBinding, CompetitiveTranscription FactorsDNA-Binding ProteinsMutagenesis, Site-DirectedTranscription, GeneticCell LineMutationDNARecombinant ProteinsEscherichia coliBinding Sites, AntibodyGene Expression RegulationEnhancer Elements, GeneticConsensus SequenceSequence Homology, Amino AcidSp1 Transcription FactorRegulatory Sequences, Nucleic AcidSequence AlignmentDNA FootprintingTransfectionRadioligand AssayRecombinant Fusion ProteinsNuclear ProteinsBacterial ProteinsCloning, MolecularRepressor ProteinsConserved Sequence