BtuE mediates resistance to ROS elicitors in E. coli.

Growth inhibition zones for wild type, btuE-overexpressing (pBAD/btuE), btuE-deficient (ΔbtuE), and genetically complemented btuE mutant (ΔbtuE pBAD/btuE) cells were determined as described in Methods. Cells growing in the presence of 0.2% arabinose were exposed to K2TeO3 (10 µl, 1 mg ml−1), H2O2 (10 µl, 3% v/v), K2CrO4 (10 µl, 1 M) and CdCl2 (10 µl, 1 M). Parentheses indicate the amount and concentration of each toxin that was applied to the disks. Values are the mean of 4 to 6 independent experiments ± SD.