Fig. 5
Schematic view of the main operons involved in metal resistance in the AZUL genome. A Genes of the czc system for resistance to cadmium, cobalt and zinc (yellow boxes). B Copper resistance cop (blue boxes) and cus (purple boxes), cupredoxin genes (cdx1 and cdx-2, dark gray boxes), silP and tolC (green). C Chr chromate efflux genes chrA, chrB, chrC, srpC and chrp (pink boxes). D Mercury resistance genes merP, merF, merT and merR1 genes, located in the vicinity of tniQ, tniB and tnsB genes, which participate in transposition (all orange boxes). E The main regulatory units of the AZUL arsenic resistance system (blue boxes) contain arsC, acr3, arsH and regulatory arsR and hlyU genes. In all the operons, box arrowheads show the orientation of each coding region. Light gray boxes represent unrelated or hypothetical coding regions and green boxes represent genes for resistance to other stressors. The numbered black lines indicate the size of each operon in base pairs. The scale is maintained for each resistance system, but different systems have different scales, in bp. For details about the function of each gene, please refer to Table 4