title: Characterization of MarR superrepressor mutants.
abstract: MarR negatively regulates expression of the multiple antibiotic resistance (mar) locus in Escherichia coli. Superrepressor mutants, generated in order to study regions of MarR required for function, exhibited altered inducer recognition properties in whole cells and increased DNA binding to marO in vitro. Mutations occurred in three areas of the relatively small MarR protein (144 amino acids). It is surmised that superrepression results from increased DNA binding activities of these mutant proteins.
mesh_terms: D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001483:Base Sequence; D018983:DNA Footprinting; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial / Q000235:genetics; D017930:Genes, Reporter; D008969:Molecular Sequence Data; D010641:Phenotype; D011485:Protein Binding; D012097:Repressor Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D012641:Selection, Genetic; D013489:Suppression, Genetic; D001616:beta-Galactosidase / Q000378:metabolism