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© Melanie Blokesch, EPFL
Flagellated Vibrio cholerae
Publication : Antimicrobial agents and chemotherapy

Fluoroquinolone efflux in Streptococcus suis is mediated by SatAB and not by SmrA

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Antimicrobial agents and chemotherapy - 19 Sep 2011

Escudero JA, San Millan A, Gutierrez B, Hidalgo L, La Ragione RM, AbuOun M, Galimand M, Ferrándiz MJ, Domínguez L, de la Campa AG, Gonzalez-Zorn B

Link to Pubmed [PMID] – 21930876

Antimicrob. Agents Chemother. 2011 Dec;55(12):5850-60

Streptococcus suis is an emerging zoonotic pathogen. With the lack of an effective vaccine, antibiotics remain the main tool to fight infections caused by this pathogen. We have previously observed a reserpine-sensitive fluoroquinolone (FQ) efflux phenotype in this species. Here, SatAB and SmrA, two pumps belonging to the ATP binding cassette (ABC) and the major facilitator superfamily (MFS), respectively, have been analyzed in the fluoroquinolone-resistant clinical isolate BB1013. Genes encoding these pumps were overexpressed either constitutively or in the presence of ciprofloxacin in this strain. These genes could not be cloned in plasmids in Escherichia coli despite strong expression repression. Finally, site-directed insertion of smrA and satAB in the amy locus of the Bacillus subtilis chromosome using ligated PCR amplicons allowed for the functional expression and study of both pumps. Results showed that SatAB is a narrow-spectrum fluoroquinolone exporter (norfloxacin and ciprofloxacin), susceptible to reserpine, whereas SmrA was not involved in fluoroquinolone resistance. Chromosomal integration in Bacillus is a novel method for studying efflux pumps from Gram-positive bacteria, which enabled us to demonstrate the possible role of SatAB, and not SmrA, in fluoroquinolone efflux in S. suis.

http://www.ncbi.nlm.nih.gov/pubmed/21930876