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Characterization of a Cryptic and Intriguing Low Molecular Weight Plasmid

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Abstract

The complete nucleotide sequence of cryptic plasmid pVCM04 isolated from Salmonella enterica serovar Enteritidis was determined and analyzed. pVCM04 contains 3853 bp with 53.6 % GC content and has twelve ORFs with more than 50 amino acids. Five of these sequences showed homology with replication and mobilization proteins. ORF1 and ORF2 showed homology with replication proteins, while ORFs 3–5 showed homology with mobilization proteins. The pVCM04 possesses a region associated with the theta-type replication mechanism. BLASTn search analysis revealed unexpectedly no similarity with sequences deposited in GenBank. The nucleotide sequence of pVCM04 can be divided into two arms: the region between nucleotides 552–1774 (encoding RepA and RepB) and the region between nucleotides 1775–3853 (encoding MobA, MobB and MobC). Codon bias pattern is distinct between mobA and repA, so the program Modeltest was used to select the best evolutionary model to study these genes. The result of ModelTest (model GTR+G for mobA and model HKY+G for repA) suggests that these genes would be subject to different selective pressures. Considering the differences in the codon usage, the selection of two different evolutionary models, and the absence of plasmids with homology to pVCM04 in GenBank, we believe that pVCM04 is a chimeric molecule and represents a new plasmid lineage.

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Acknowledgments

We thank the National Council for the Improvement of Higher Education (CAPES) for the scholarship and financial support and National Council for Scientific and Technological Development (CNPq) for financial support 47.8545.

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Authors and Affiliations

  1. Department of Biochemistry and Molecular Biology, Federal University of Goiás, Campus Samambaia, Goiânia, GO, Brazil

    Lilian C. Carneiro, Paulo Vinicius C. Mendes, Silvana P. Silva, Guilherme R. L. Souza & Luiz Artur M. Bataus

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  1. Lilian C. Carneiro
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  2. Paulo Vinicius C. Mendes
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  3. Silvana P. Silva
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  4. Guilherme R. L. Souza
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  5. Luiz Artur M. Bataus
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Correspondence to Luiz Artur M. Bataus.

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Carneiro, L.C., Mendes, P.V.C., Silva, S.P. et al. Characterization of a Cryptic and Intriguing Low Molecular Weight Plasmid. Curr Microbiol 72, 351–356 (2016). https://doi.org/10.1007/s00284-015-0959-7

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  • DOI: https://doi.org/10.1007/s00284-015-0959-7

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