Journal
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
Volume 52, Issue -, Pages 1477-1484Publisher
SOC GENERAL MICROBIOLOGY
DOI: 10.1099/ijs.0.02159-0
Keywords
phylogeny; Gram-positive bacteria; DNA-dependent RNA polymerase; rpoB gene; rifampicin resistance
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In this study, we have sequenced the rpoB gene, encoding the beta subunit of DNA-dependent RNA polymerase, from a selection of Gram-positive and Gram-negative bacteria. The presence of insertions and deletions (indels) in the beta subunit separate the Gram-positive and Gram-negative bacteria from each other and support the division of the Gram-positive organisms into two clades based on DNA G+C content. Phylogenetic and amino acid content analyses further separate the clostridia from bacilli, leuconostocs, listeriae and relatives, forming an early branch after the common Gram-positive ancestor. The occurrence in the beta subunit of Asn-Ala at positions 471-472 in Porphyromonas cangingivalis and Asn at position 372 in Weissella paramesenteroides are postulated to be the cause of the natural rifampicin resistance of these species.
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