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Gramicidin D enhances the antibacterial activity of fluoride.


ABSTRACT: Fluoride is a toxic anion found in many natural environments. One of the major bacterial defenses against fluoride is the cell envelope, which limits passage of the membrane-impermeant fluoride anion. Accordingly, compounds that enhance the permeability of bacterial membranes to fluoride should also enhance fluoride toxicity. In this study, we demonstrate that the pore-forming antibiotic gramicidin D increases fluoride uptake in Bacillus subtilis and that the antibacterial activity of this compound is potentiated by fluoride. Polymyxin B, another membrane-targeting antibiotic with a different mechanism of action, shows no such improvement. These results, along with previous findings, indicate that certain compounds that destabilize bacterial cell envelopes can enhance the toxicity of fluoride.

SUBMITTER: Nelson JW 

PROVIDER: S-EPMC4048840 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature

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Gramicidin D enhances the antibacterial activity of fluoride.

Nelson James W JW   Zhou Zhiyuan Z   Breaker Ronald R RR  

Bioorganic & medicinal chemistry letters 20140328 13


Fluoride is a toxic anion found in many natural environments. One of the major bacterial defenses against fluoride is the cell envelope, which limits passage of the membrane-impermeant fluoride anion. Accordingly, compounds that enhance the permeability of bacterial membranes to fluoride should also enhance fluoride toxicity. In this study, we demonstrate that the pore-forming antibiotic gramicidin D increases fluoride uptake in Bacillus subtilis and that the antibacterial activity of this compo  ...[more]

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