[No authors listed]
Spontaneous rifampicin-resistant (RFM(R)) mutants were isolated from Bacillus subtilis 168 cultivated in the presence or absence of oxygen. By DNA sequencing, the mutations were located within Cluster I of the rpoB gene encoding the β subunit of RNA polymerase. The spectrum of RFM(R) rpoB mutations isolated from B. subtilis cells grown anaerobically differed from aerobically grown cells, not only with respect to the location of mutations within Cluster I but also in the class of mutation observed (transition versus transversion). In the absence of RFM, RFM(R) mutants exhibited poorer growth under anaerobic conditions than did the wild-type strain, indicating their lower fitness in the absence of antibiotic selection.
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