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J Bacteriol. 1992 March; 174(5): 1596-1603

research-article

Nucleotide sequence of the Staphylococcus aureus gyrB-gyrA locus encoding the DNA gyrase A and B proteins.

E E Margerrison, R Hopewell and L M Fisher

Department of Cellular and Molecular Sciences, St. George's Hospital Medical School, Cranmer Terrace, London, United Kingdom.

ABSTRACT

We have determined the nucleotide sequence of a 5.3-kb segment of the Staphylococcus aureus chromosome that includes the gyrA and gyrB genes coding for both subunits of DNA gyrase, the enzyme that catalyzes ATP-dependent DNA supercoiling. The gene order at this locus, dnaA-dnaN-recF-gyrB-gyrA, is similar to that found in the Bacillus subtilis replication origin region. S. aureus recF, gyrB, and gyrA genes are closely spaced, occupy the same reading frame, and may be coordinately expressed. The S. aureus gyrB and gyrA genes encode 640- and 889-residue proteins, respectively, that share strong homology with other bacterial gyrase subunits, notably those from B. subtilis. These results are discussed in regard to the mechanism of DNA gyrase and its role as a target for the 4-quinolones and other antistaphylococcal agents.

J Bacteriol. 1992 March; 174(5): 1596-1603




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