Cytotoxic Effect Associated with Overexpression of QNR Proteins in Escherichia coli.
Microb Drug Resist
; 23(7): 822-825, 2017 Oct.
Article
en En
| MEDLINE
| ID: mdl-28287903
ABSTRACT
OBJECTIVE:
The objective was to evaluate the cytotoxic effect associated with overexpression of multiple Qnr-like plasmid-mediated quinolone resistance (PMQR) mechanisms in Escherichia coli.METHODS:
Coding regions of different PMQR genes (qnrA1, qnrB1, qnrC, qnrD1, qnrS1, and qepA2) and efsqnr were cloned into pET29a(+) vector and overexpressed in E. coli BL21. E. coli BL21 with and without an empty pET29a(+) vector were used as controls. The cytotoxic effect associated with PMQR mechanism overexpression was determined by transmission electron microscopy and viability assays.RESULTS:
Overexpressed qnr genes produced loss of bacterial viability in the range of 77-97% compared with the controls, comparable with loss of viability associated with EfsQnr overexpression (97%). No loss of viability was observed in E. coli overexpressing QepA2. In transmission electron microscopy assays, signs of cytotoxicity were observed in E. coli cells overexpressing EfsQnr and Qnr proteins (30-45% of the bacterial population showed morphological changes). Morphological changes were observed in less than 5% of bacterial populations from the control strains and E. coli overexpressing QepA2.CONCLUSIONS:
Overexpression of qnr genes produces a cytotoxic cellular and structural effect in E. coli, the magnitude of which varies depending on the family of Qnr proteins.Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Proteínas de Escherichia coli
/
Farmacorresistencia Bacteriana
/
Escherichia coli
Tipo de estudio:
Risk_factors_studies
Idioma:
En
Revista:
Microb Drug Resist
Asunto de la revista:
MICROBIOLOGIA
/
TERAPIA POR MEDICAMENTOS
Año:
2017
Tipo del documento:
Article