期刊
ANTIBIOTICS-BASEL
卷 11, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/antibiotics11030325
关键词
DinB; homologous recombination; ImuBC; induced mutagenesis; PolB; SOS response; resistance
资金
- PRIN [commi 314-337 Legge 232/2016]
- Italian Ministry of Education, University and Research (MIUR, Italy)
- Regione Lazio (Gruppi di Ricerca) [POR A0375E0026]
In the pathogen Pseudomonas aeruginosa, SOS response is not necessary for antibiotic-induced mutagenesis, unlike in Escherichia coli. RecA plays a crucial role in homologous recombination and SOS response induction in P. aeruginosa. Antibiotic-induced mutagenesis only occurs in P. aeruginosa.
To cope with stressful conditions, including antibiotic exposure, bacteria activate the SOS response, a pathway that induces error-prone DNA repair and mutagenesis mechanisms. In most bacteria, the SOS response relies on the transcriptional repressor LexA and the co-protease RecA, the latter being also involved in homologous recombination. The role of the SOS response in stress- and antibiotic-induced mutagenesis has been characterized in detail in the model organism Escherichia coli. However, its effect on antibiotic resistance in the human pathogen Pseudomonas aeruginosa is less clear. Here, we analyzed a recA deletion mutant and confirmed, by conjugation and gene expression assays, that RecA is required for homologous recombination and SOS response induction in P. aeruginosa. MIC assays demonstrated that RecA affects P. aeruginosa resistance only towards fluoroquinolones and genotoxic agents. The comparison of antibiotic-resistant mutant frequency between treated and untreated cultures revealed that, among the antibiotics tested, only fluoroquinolones induced mutagenesis in P. aeruginosa. Notably, both RecA and error-prone DNA polymerases were found to be dispensable for this process. These data demonstrate that the SOS response is not required for antibiotic-induced mutagenesis in P. aeruginosa, suggesting that RecA inhibition is not a suitable strategy to target antibiotic-induced emergence of resistance in this pathogen.
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