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. 1992 Dec;174(24):8158–8162. doi: 10.1128/jb.174.24.8158-8162.1992

Analysis of operons encoding 23S rRNA of Clostridium botulinum type A.

A K East 1, D E Thompson 1, M D Collins 1
PMCID: PMC207558  PMID: 1339427

Abstract

Southern hybridization analysis of Clostridium botulinum type A chromosomal DNA indicated the presence of six copies of the 23S rRNA gene. Fragments of DNA encoding 23S rRNA were amplified by polymerase chain reaction and cloned in Escherichia coli. Three clones examined by restriction enzyme and sequence analysis were found to be derived from different operons. Sequence determination of the entire insert of two clones revealed nine nucleotide changes in the genes coding for 23S rRNA (99.7% sequence identity) between operons encoded on the same chromosome, showing microheterogeneity in the rRNA operons of this organism.

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Selected References

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