Abstract
Antibiotic resistance is considered a global threat to public health. Adaptive resistance mutations and the acquisition of resistance genes by horizontal gene transfer are known to be facilitated by the RecA-dependent SOS response during antibiotic treatment, making RecA inhibitors promising agents for the prevention of antibiotic resistance. However, the impact of RecA inactivation on antibiotic sensitivities remains unclear. Therefore, in this study, we performed high-throughput screening to determine the minimum inhibitory concentrations (MICs) of 217 chemicals, including both antibiotics and toxic chemicals of unknown drug action, in the wild-type MDS42 and the ΔrecA mutant strains of Escherichia coli. The ΔrecA mutant showed increased sensitivity to DNA-damaging agents, DNA replication inhibitors, and chromate stress, as well as to other chemicals, such as S-(2-aminoethyl)-L-cysteine, L-histidine, ruthenium red, D-penicillamine, carbonyl cyanide 3-chlorophenylhydrazone (CCCP), cerulenin, and L-cysteine. Microarray analysis showed further that the ΔrecA mutant had lower expressions of glnK, nac, and glnLG, which encode nitrogen assimilation regulators, as well as amtB, which encodes an ammonium transporter, compared with th...Continue Reading
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