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Global analysis of the Staphylococcus aureus response to mupirocin

Reiss, Swantje
Pané-Farré, Jan
Fuchs, Stephan
Liebeke, Manuel
Lindequist, Ulrike
Lalk, Michael
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Published in Antimicrobial agents and chemotherapy. 2012, vol. 56, no. 2, p. 787-804
Abstract In the present study, we analyzed the response of S. aureus to mupirocin, the drug of choice for nasal decolonization. Mupirocin selectively inhibits the bacterial isoleucyl-tRNA synthetase (IleRS), leading to the accumulation of uncharged isoleucyl-tRNA and eventually the synthesis of (p)ppGpp. The alarmone (p)ppGpp induces the stringent response, an important global transcriptional and translational control mechanism that allows bacteria to adapt to nutritional deprivation. To identify proteins with an altered synthesis pattern in response to mupirocin treatment, we used the highly sensitive 2-dimensional gel electrophoresis technique in combination with mass spectrometry. The results were complemented by DNA microarray, Northern blot, and metabolome analyses. Whereas expression of genes involved in nucleotide biosynthesis, DNA metabolism, energy metabolism, and translation was significantly downregulated, expression of isoleucyl-tRNA synthetase, the branched-chain amino acid pathway, and genes with functions in oxidative-stress resistance (ahpC and katA) and putative roles in stress protection (the yvyD homologue SACOL0815 and SACOL1759 and SACOL2131) and transport processes was increased. A comparison of the regulated genes to known regulons suggests the involvement of the global regulators CodY and SigB in shaping the response of S. aureus to mupirocin. Of particular interest was the induced transcription of genes encoding virulence-associated regulators (i.e., arlRS, saeRS, sarA, sarR, sarS, and sigB), as well as genes directly involved in the virulence of S. aureus (i.e., fnbA, epiE, epiG, and seb).
Keywords Anti-Bacterial Agents/pharmacologyBacterial Proteins/genetics/metabolismElectrophoresisGelTwo-DimensionalGene Expression ProfilingGene Expression RegulationBacterialHumansIsoleucine-tRNA Ligase/antagonists & inhibitors/genetics/metabolismMass SpectrometryMicrobial Sensitivity Tests/methodsMupirocin/pharmacologyOligonucleotide Array Sequence AnalysisStaphylococcal Infections/microbiologyStaphylococcus aureus/drug effects/genetics/growth & development/metabolismTranscriptomeVirulence/drug effects
PMID: 22106209
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Research group Analyse génomique et fonctionnelle du staphylocoque doré (604)
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REISS, Swantje et al. Global analysis of the Staphylococcus aureus response to mupirocin. In: Antimicrobial agents and chemotherapy, 2012, vol. 56, n° 2, p. 787-804. doi: 10.1128/AAC.05363-11 https://archive-ouverte.unige.ch/unige:26228

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Deposited on : 2013-02-06

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