Fig. 5
Phylogenetic distribution of putative signalling-like genes related with the conjugation system. The luxR transcriptional regulator, abc transporter, XRE/pbsX transcriptional regulator and nusG transcriptional regulator-termination nucleotide sequences from the 7 plasmids of this study that harbor the type IV MPFT secretion system, were used independently (a, b, c and d) and concatenated (e) to carry out a phylogenetic analysis. In addition, the phylogeny of these plasmids was carried out using the core genes obtained for these plasmids in this study (27 genes) (f), using the repA sequences (g) and analyzing a concatenated dataset containing 27 core plasmid sequences (h). The neighbor-joining tree using the Jukes-Cantor model was generated by MEGA 5. Bootstrap values (1000 repetitions) are show on the branches. Blue box: copper resistance plasmids. Red box: non-copper resistance plasmids. Purple box: copper resistance and non-resistance plasmids