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The B subunit of DNA gyrase (GyrB) consists of a 43 kDa N-terminal domain, containing the site of ATP binding and hydrolysis, and a 47 kDa C-terminal domain that is thought to play a role in interactions with GyrA and DNA. In cells containing a deletion of topA (the gene encoding DNA topoisomerase I) a compensatory mutation is found in gyrB. This mutation (gyrB-225) results in a two amino acid insertion...
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