Fig. 6.

OsbR is required for fully ohrA expression and protection against oxidative stress. a Northern blot of ohrA using the indicated strains untreated (−) or treated (+) with 100 μM CHP for 10 min. The same film was exposed for 24 h (top) or 4 days (bottom). Ribosomal RNA loading is shown below. Full-length blot and RNA loading gel are presented in Additional file 3, Fig. S5. b, c Growth curves of different strains under oxidative stress. The indicated C. violaceum strains were grown in LB treated with either 120 μM TBHP (b) or 55 μM CHP (c)