Lactococcus garvieae carries a chromosomally encoded pentapeptide repeat protein that confers reduced susceptibility to quinolones in Escherichia coli producing a cytotoxic effect
| Autor: | M. Teresa Cutuli, Paula Díaz de Alba, Alicia Gibello, Jesús Machuca, José-Manuel Rodríguez-Martínez, M. Mar Blanco |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Nalidixic acid
Gene Expression Microbial Sensitivity Tests Quinolones medicine.disease_cause Microbiology Pentapeptide repeat law.invention Nalidixic Acid Minimum inhibitory concentration Microscopy Electron Transmission Ciprofloxacin law Drug Resistance Bacterial Lactococcus Escherichia coli medicine Molecular Biology Gene biology Cell Membrane General Medicine biology.organism_classification Recombinant Proteins Anti-Bacterial Agents Lactococcus garvieae Recombinant DNA Bacteria medicine.drug |
| Zdroj: | Research in Microbiology. 165:590-599 |
| ISSN: | 0923-2508 |
| DOI: | 10.1016/j.resmic.2014.05.033 |
| Popis: | This study characterises a chromosomal gene of Lactococcus garvieae encoding a pentapeptide repeat protein designated as LgaQnr. This gene has been implicated in reduced susceptibility to quinolones in this bacterium, which is of relevance to both veterinary and human medicine. All of the L. garvieae isolates analysed were positive for the lgaqnr gene. The expression of lgaqnr in Escherichia coli reduced the susceptibility to quinolones, producing an adverse effect. The reduced susceptibility to ciprofloxacin was 16-fold in E. coli ATCC 25922 and 32-fold in E. coli DH10B, compared to the control strains. The minimum inhibitory concentration of nalidixic acid was also increased 4 or 5-fold. The effect of the expression of lgaqnr in E. coli was investigated by electron microscopy and was observed to affect the structure of the cell and the inner membrane of the recombinant cells. |
| Databáze: | OpenAIRE |
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