Increased antibiotic killing caused by mazG deletion is associated with ROS and DSB. Stationary cultures of Msm strains were exposed to 200 mg/L Rif, 30.

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Increased antibiotic killing caused by mazG deletion is associated with ROS and DSB. Stationary cultures of Msm strains were exposed to 200 mg/L Rif, 30 mg/L Cfx, or 10 mg/L Str. Increased antibiotic killing caused by mazG deletion is associated with ROS and DSB. Stationary cultures of Msm strains were exposed to 200 mg/L Rif, 30 mg/L Cfx, or 10 mg/L Str. (A) Intracellular ROS levels measured by fluorescent dye dihydroethidium and flow cytometry at indicated times after exposure to antibiotics. (B) qRT-PCR analysis of gene expression after exposure to Cfx for 24 h, Str for 90 min, and 5 mM H2O2 for 30 min. (C) Survival of exponential-phase (E) and stationary-phase (S) cultures after exposure to 1 mM tert-butyl hydroperoxide (a stable oxidant). (D) DSB levels measured by TUNEL assay at indicated time points. com, the complemented mutant; wt, wild type. Data shown are mean ± SE in triplicate. Significant values are *P ≤ 0.05, **P ≤ 0.01, ***P ≤ 0.001. Xiao-Yong Fan et al. PNAS 2018;115:9:2210-2215 ©2018 by National Academy of Sciences