Repressor ProteinsAmino AcidsOperator Regions, GeneticSequence Homology, Amino AcidAmino Acid SequenceLac RepressorsBase SequenceMolecular Sequence DataEscherichia coliBacterial ProteinsCloning, MolecularTranscription FactorsDNA-Binding ProteinsBinding SitesTranscription, GeneticProtein BindingOperonMutationPromoter Regions, GeneticAmino Acid SubstitutionIsopropyl ThiogalactosidePlasmidsGene Expression Regulation, BacterialSequence AlignmentDNAViral Regulatory and Accessory ProteinsGenes, BacterialGenes, RegulatorRecombinant Fusion ProteinsDNA, BacterialMutagenesis, Site-DirectedEscherichia coli ProteinsAmino Acid MotifsAmino Acids, EssentialProtein ConformationProtein Structure, TertiaryRestriction MappingSequence Homology, Nucleic AcidAmino Acid Transport SystemsRecombinant ProteinsModels, MolecularKineticsRNA, MessengerCell LineDNA, ComplementaryStructure-Activity RelationshipGene Expression RegulationViral ProteinsCarrier ProteinsZinc FingersNuclear ProteinsProtein BiosynthesisBacteriophage lambdaLac OperonLysogenyTransfectionMolecular WeightSequence Analysis, DNASaccharomyces cerevisiaeDNA PrimersElectrophoresis, Polyacrylamide GelConsensus SequenceGenesPeptide FragmentsAmino Acids, AromaticLactoseTrans-ActivatorsProtein Structure, SecondaryTryptophanMutagenesisSequence DeletionProteinsLeucineAmino Acids, Branched-ChainDimerizationDNA FootprintingEnzyme RepressionAmino Acids, SulfurTwo-Hybrid System TechniquesRegulatory Sequences, Nucleic AcidHistone DeacetylasesGene ExpressionOpen Reading FramesMacromolecular SubstancesSubstrate SpecificityGenetic Complementation TestHeLa CellsPeptidesElectrophoretic Mobility Shift AssayTetracyclineSaccharomyces cerevisiae ProteinsConserved Sequencebeta-GalactosidaseGenes, ReporterGene Expression Regulation, FungalColiphagesFungal ProteinsDrosophila ProteinsBlotting, NorthernPhenotype