DNA gyrase from Bacillus subtilis 168 was purified by affinity chromatography on novobiocin-Sepharose and shown to consist of two subunits, A and B, with molecular weights of 100,000 and 85,000, respectively. The B subunits, which contains novobiocin-sensitive. ATPase activity, could complement the gyrA protein of Escherichia coli. No complementation was detected between the A subunit and the E. coli gyrB protein.
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Orr et al. (1982) studied this question.
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