6S RNA-Dependent Susceptibility to RNA Polymerase Inhibitors.
Antimicrob Agents Chemother
; 66(5): e0243521, 2022 05 17.
Article
em En
| MEDLINE
| ID: mdl-35389235
ABSTRACT
Bacterial small RNAs (sRNAs) contribute to a variety of regulatory mechanisms that modulate a wide range of pathways, including metabolism, virulence, and antibiotic resistance. We investigated the involvement of sRNAs in rifampicin resistance in the opportunistic pathogen Staphylococcus aureus. Using a competition assay with an sRNA mutant library, we identified 6S RNA as being required for protection against low concentrations of rifampicin, an RNA polymerase (RNAP) inhibitor. This effect applied to rifabutin and fidaxomicin, two other RNAP-targeting antibiotics. 6S RNA is highly conserved in bacteria, and its absence in two other major pathogens, Salmonella enterica and Clostridioides difficile, also impaired susceptibility to RNAP inhibitors. In S. aureus, 6S RNA is produced from an autonomous gene and accumulates in stationary phase. In contrast to what was reported for Escherichia coli, S. aureus 6S RNA does not appear to play a critical role in the transition from exponential to stationary phase but affects σB-regulated expression in prolonged stationary phase. Nevertheless, its protective effect against rifampicin is independent of alternative sigma factor σB activity. Our results suggest that 6S RNA helps maintain RNAP-σA integrity in S. aureus, which could in turn help bacteria withstand low concentrations of RNAP inhibitors.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Rifampina
/
Staphylococcus aureus
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Antimicrob Agents Chemother
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
França