the binding of triclosan to smet, the repressor of the multidrug efflux pump smedef, induces antibiotic resistance in stenotrophomonas maltophilia绑定的三氯生手中,耐多药外排泵smedef的抑制因子,导致抗生素耐药性stenotrophomonas maltophilia.pdf

The Binding of Triclosan to SmeT, the Repressor of the Multidrug Efflux Pump SmeDEF, Induces Antibiotic Resistance in Stenotrophomonas maltophilia ´ 1. 2. 2 ´ ´ 1 Alvaro Hernandez , Federico M. Ruiz , Antonio Romero , Jose L. Martınez * ´ ´ 1 Centro Nacional del Biotecnologıa, CSIC, Cantoblanco, Madrid, Spain, 2 Centro de Investigaciones Biologicas, CSIC, Madrid, Spain Abstract The wide utilization of biocides poses a concern on the impact of these compounds on natural bacterial populations. Furthermore, it has been demonstrated that biocides can select, at least in laboratory experiments, antibiotic resistant bacteria. This situation has raised concerns, not just on scientists and clinicians, but also on regulatory agencies, which are demanding studies on the impact that the utilization of biocides may have on the development on resistance and consequently on the treatment of infectious diseases and on human health. In the present article, we explored the possibility that the widely used biocide triclosan might induce antibiotic resistance using as a model the opportunistic pathogen Stenotrophomonas maltophilia. Biochemical, functional and structural studies were performed, focusing on SmeDEF, the most relevant antibiotic- and triclosan-removing multidrug efflux pump of S. maltophilia. Expression of smeDEF is regulated by the repressor SmeT. Triclosan released SmeT from its operator and induces the expression of smeDEF, thus reducing the susceptibility of S. maltophilia to antibiotics in the presence of