title: The oxyR gene from Erwinia carotovora: cloning, sequence analysis and expression in Escherichia coli.
abstract: Homologs of the Escherichia coli oxyR gene were identified in several Erwinia species, using a combination of PCR and Southern hybridization analysis. The oxyR gene from Erwinia carotovora was isolated on a cosmid clone and characterized. The gene and deduced gene product shared high level sequence identity with their E. coli counterparts (78 and 89% identity, respectively). In E. coli, the oxyR gene is a transcriptional activator that, under oxidizing conditions, induces expression of a set of oxidative defence genes. OxyR null mutants are, therefore, sensitive to hydrogen peroxide. Introduction of the E. carotovora oxyR gene into an E. coli oxyR mutant resulted in transformants that were hydrogen peroxide resistant, indicating that the Erwinia protein was functional in E. coli.
authors.affiliation: Cancer Research Center, University of Missouri, Columbia, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Calcutt
authors.forename: M S
authors.initials: MS
authors.lastname: Lewis
authors.forename: A
authors.initials: A
authors.lastname: Eisenstark
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D003360:Cosmids / Q000235:genetics; D004269:DNA, Bacterial / Q000032:analysis; D004268:DNA-Binding Proteins; D004352:Drug Resistance, Microbial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008969:Molecular Sequence Data; D016877:Oxidants / Q000494:pharmacology; D016973:Pectobacterium carotovorum / Q000235:genetics*; D010957:Plasmids / Q000235:genetics; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D016877:Oxidants; D012097:Repressor Proteins; D014157:Transcription Factors; C499299:oxyR protein, E coli; D006861:Hydrogen Peroxide