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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 vs. 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.

Anaerobic growth ofBacillus subtilisalters the spectrum of spontaneous mutations in therpoBgene leading to rifampicin resistance