Journal
EMBO REPORTS
Volume 10, Issue 8, Pages 929-933Publisher
WILEY
DOI: 10.1038/embor.2009.99
Keywords
antibiotic resistance; ciprofloxacin; qnrB; SOS response
Categories
Funding
- French Ministere de la Recherche
- Conseil Regional du Limousin
- Fondation pour la Recherche Medicale
- Institut National de la Sante et de la Recherche Medicale (Inserm).
- Ministerio de Ciencia e Innovacion (MICINN) [BFU2008-01078/BMC]
- Generalitat de Catalunya
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The qnr genes are plasmid-borne fluoroquinolone-resistance determinants widespread in Enterobacteriaceae. Three families of qnr determinants (qnrA, B and S) have been described, but little is known about their expression and regulation. Two new determinants, qnrC and qnrD, have been found recently. Here, we describe the characterization of the qnrB2 promoter and the identification of a LexA-binding site in the promoter region of all qnrB alleles. LexA is the central regulator of the SOS response to DNA damage. We show that qnrB2 expression is regulated through the SOS response in a LexA/RecA-dependent manner, and that it can be induced by the quinolone ciprofloxacin, a known inducer of the SOS system. This is the first description of direct SOS-dependent regulation of an antibiotic-resistance mechanism in response to the antibiotic itself.
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