title: Purification and ligand binding of EmrR, a regulator of a multidrug transporter.
abstract: EmrR, the repressor of the emrRAB operon of Escherichia coli, was purified to 95% homogeneity. EmrR was found to bind putative ligands of the EmrAB pump-2,4-dinitrophenol, carbonyl cyanide m-chlorophenylhydrazone, and carbonyl cyanide p-(trifluoro-methoxy)phenylhydrazone-with affinities in the micromolar range. Equilibrium dialysis experiments suggested one bound ligand per monomer of the dimeric EmrR.
authors.affiliation: Biotechnology Center, Tufts University, Medford, Massachusetts 02155, USA.
authors.forename: A
authors.initials: A
authors.lastname: Brooun
authors.forename: J J
authors.initials: JJ
authors.lastname: Tomashek
authors.forename: K
authors.initials: K
authors.lastname: Lewis
mesh_terms: D019297:2,4-Dinitrophenol / Q000378:metabolism / Q000494:pharmacology; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000302:isolation & purification* / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D001667:Binding, Competitive / Q000187:drug effects; D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone / Q000378:metabolism / Q000494:pharmacology; D002259:Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone / Q000378:metabolism / Q000494:pharmacology; D003956:Dialysis; D004926:Escherichia coli / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D008024:Ligands; D012097:Repressor Proteins / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D014157:Transcription Factors
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D008024:Ligands; D012097:Repressor Proteins; D014157:Transcription Factors; C093326:mprA protein, E coli; D002259:Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone; D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone; D019297:2,4-Dinitrophenol