Transcription regulates oxolinic acid-induced DNA gyrase cleavage at specific sites on the E. coli chromosome.
Prominent DNA gyrase-mediated cleavage sites, induced by oxolinic acid, occur at specific, but infrequent, locations on the Escherichia coli chromosome. These sites, which we call toposites, may represent high affinity DNA gyrase binding sites or may mark chromosomal regions that accumulate superhelical stress. Toposites are usually grouped in 5 to 10 kb clusters that are mostly 50 to 100 kb apart. The total number of clusters on the chromosome is between 50 and 100. The location of sites depends on the local sequence. The extent of DNA gyrase cleavage at toposites can be strongly modulated by transcription occurring at as far as 35 kb away.
Condemine
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Laboratoire de Microbiologie, INSA Bat 406, Villeurbanne, France.
Smith
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CL
D001665:Binding Sites; D002876:Chromosomes, Bacterial / Q000378:metabolism; D003001:Cloning, Molecular; D004250:DNA Topoisomerases, Type II / Q000378:metabolism*; D004269:DNA, Bacterial / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development; D005144:F Factor; D010093:Oxolinic Acid / Q000494:pharmacology*; D015183:Restriction Mapping; D012293:Rifampin / Q000494:pharmacology; D059005:Topoisomerase II Inhibitors; D014158:Transcription, Genetic
D004269:DNA, Bacterial; D059005:Topoisomerase II Inhibitors; D004250:DNA Topoisomerases, Type II; D010093:Oxolinic Acid; D012293:Rifampin