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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
Nucleotide sequences and comparison of two large conjugative plasmids from different Campylobacter species.
Microbiology 2004 October
Two large tetracycline resistance (TcR) plasmids have been completely sequenced, the pTet plasmid (45.2 kb) from Campylobacter jejuni strain 81-176 and a plasmid pCC31 (44.7 kb) from Campylobacter coli strain CC31 that was isolated from a human case of severe gastroenteritis in the UK. Both plasmids are mosaic in structure, having homologues of genes found in a variety of different commensal and pathogenic bacteria, but nevertheless, showed striking similarities in DNA sequence and overall gene organization. Several predicted proteins encoded by genes involved in conjugation showed highest homology to proteins found in Actinobacillus actinomycetemcomitans, a periodontal pathogen. In addition to replication- and conjugation-associated genes, both plasmids carried a tet(O) gene encoding tetracycline resistance, a 6 kb ORF encoding a putative methylase and a number of genes of unknown function. The pTet plasmid co-exists in C. jejuni strain 81-176 with a smaller, previously characterized, non-conjugative plasmid pVir that also encodes a type IV secretion system (T4SS) that may affect virulence. In contrast, the T4SS encoded by pTet and pCC31 are shown to mediate bacterial conjugation between Campylobacter. The possible origin and evolution of pCC31 and pTet is discussed.
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