PMID:2511419

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Citation

Tao, K, Makino, K, Yonei, S, Nakata, A and Shinagawa, H (1989) Molecular cloning and nucleotide sequencing of oxyR, the positive regulatory gene of a regulon for an adaptive response to oxidative stress in Escherichia coli: homologies between OxyR protein and a family of bacterial activator proteins. Mol. Gen. Genet. 218:371-6

Abstract

Treatment of Escherichia coli and Salmonella typhimurium cells with a low dose of hydrogen peroxide induces expression of a large number of genes, and confers resistance to oxidative stresses. The oxyR gene encodes a positive regulatory protein for a subset of these genes involved in the defense against oxidative damage. We cloned a DNA fragment that contains the E. coli oxyR region on a plasmid vector, and analyzed the nucleotide sequence of the gene. The amino acid sequence of OxyR protein, deduced from the nucleotide sequence, shows a high degree of homology to the sequences of a number of bacterial activator proteins including LysR, CysB, IlvY, MetR and NodD. The product of the oxyR gene identified by the maxicell procedure was a 34 kDa protein, which agrees with the size predicted from the nucleotide sequence of the gene.

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Keywords

Amino Acid Sequence; Bacterial Proteins/genetics; Base Sequence; Cloning, Molecular; DNA-Binding Proteins; Electrophoresis, Polyacrylamide Gel; Escherichia coli/genetics; Escherichia coli Proteins; Genes, Regulator; Hydrogen Peroxide/pharmacology; Molecular Sequence Data; Oxygen/metabolism; Plasmids; Repressor Proteins; Restriction Mapping; Sequence Homology, Nucleic Acid; Transcription Factors; beta-Galactosidase

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