FIG 3.

YbeY is required for optimal resistance to biologically relevant stresses. Sensitivity assay results are shown. Brucella abortus 2308, the ybeY deletion strain, and ybeY-comp complemented strain were assessed in a disk diffusion assay for their comparative susceptibilities to various sources of stress, including deoxycholate (10%), H₂O₂ (30%), SDS (20%), polymyxin B (10 mg/ml), and paraquat (0.25 M). The results are plotted as the average diameter (±standard deviation) of the zone of inhibition around a disk, and the results are from a single experiment that was performed in triplicate. Asterisks denote a statistically significant difference (P < 0.05; Student's t test) between the ybeY deletion strain and parental strain 2308 for a given condition.