FIG. 6.

Cadmium and zinc resistance of E. coli strains expressing a P-type ATPase from G. westfalica Kb1, GoCadA. Dose-response curves for cadmium (A) and zinc (B) are shown for E. coli strain RW3110 (ΔzntA) complemented in trans with the cadA gene of G. westfalica Kb1 cloned into plasmid pASK3 (▪). The negative control strain is RW3110(pASK3) (○), and the positive control is the wild-type strain W3110(pASK3) (•). The mean results of three (cadmium) or two (zinc) independent experiments are shown, with standard deviation bars.