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Variable numbers of rRNA gene operons in Bacillus cereus strains
T Johansen1, C R Carlson, A B Kolstø
1Institute of Pharmacy and Biotechnology Centre of Oslo, University of Oslo, Norway.
FEMS Microbiology Letters
|March 1, 1996
Abstract:
Ribosomal RNA operon organisation was analysed in two Bacillus cereus strains of different chromosome size, ATCC 10987 (5.4 Mb) and F0837/76 (2.4 Mb). We estimated that there were twelve and nine copies of the rRNA operons in these two strains, respectively. In B. cereus ATCC 10987 six rRNA operons were less than 10 kb apart, while in B. cereus F0837/76 four rRNA operons were similarly clustered. The origin of replication was located in the vicinity of a rRNA operon in both strains.