3P9T

SmeT-Triclosan complex

3P9T の概要

• エントリーDOI: 10.2210/pdb3p9t/pdb
• 分子名称: Repressor, SULFATE ION, TRICLOSAN, ... (4 entities in total)
• 機能のキーワード: transcription repressor, antibacterial, antifungal, transcription-antibiotic complex, transcription/antibiotic
• 由来する生物種: Stenotrophomonas maltophilia (Pseudomonas maltophilia)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 50063.94

構造登録者

Hernandez, A.,Ruiz, F.M.,Romero, A.,Martinez, J.L. (登録日: 2010-10-18, 公開日: 2011-08-10, 最終更新日: 2023-09-06)

主引用文献

Hernandez, A.,Ruiz, F.M.,Romero, A.,Martinez, J.L.
The Binding of Triclosan to SmeT, the Repressor of the Multidrug Efflux Pump SmeDEF, Induces Antibiotic Resistance in Stenotrophomonas maltophilia.
Plos Pathog., 7:e1002103-e1002103, 2011

PubMed 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 the biocide. The structure of SmeT bound to triclosan is described. Two molecules of triclosan were found to bind to one subunit of the SmeT homodimer. The binding of the biocide stabilizes the N terminal domain of both subunits in a conformation unable to bind DNA. To our knowledge this is the first crystal structure obtained for a transcriptional regulator bound to triclosan. This work provides the molecular basis for understanding the mechanisms allowing the induction of phenotypic resistance to antibiotics by triclosan.

PubMed: 21738470
DOI: 10.1371/journal.ppat.1002103

実験手法

X-RAY DIFFRACTION (2.02 Å)