title: The PurR binding site in the glyA promoter region of Escherichia coli.
abstract: Site-directed mutagenesis was used to change the PurR binding site in the control region of a glyA-lac gene fusion. Mutations that changed the PurR binding sequence away from the consensus sequence reduced PurR binding, which correlated with reduced purine-mediated repression. Mutations that changed the binding sequence toward the consensus sequence had no significant effect on either PurR binding or purine-mediated repression. Hypoxanthine and guanine, co-repressors for PurR-mediated regulation of the pur regulon, increased binding of PurR to glyA operator DNA.
authors: Department of Microbiology, University of Iowa, Iowa City 52242.
authors: J G
authors: JG
authors: Steiert
authors: C
authors: C
authors: Kubu
authors: G V
authors: GV
authors: Stauffer
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D004269:DNA, Bacterial / Q000235:genetics; D004268:DNA-Binding Proteins / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism*; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D011401:Promoter Regions, Genetic; D012097:Repressor Proteins / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C065825:PurR protein, Bacteria; C489317:PurR protein, E coli; D012097:Repressor Proteins