A redox-responsive macrocycle based on the crown ether C7Te for enhanced bacterial inhibition

Area of Science:

• Supramolecular Chemistry
• Antimicrobial Agents
• Bacterial Cell Membrane Interactions

Background:

• Increasing bacterial resistance to conventional disinfectants necessitates novel therapeutic strategies.
• Gram-negative bacteria like E. coli pose significant public health challenges due to resistance.
• Biofilm formation by bacteria complicates treatment and increases resistance.

Purpose of the Study:

• To design and synthesize novel crown ether compounds with antibacterial properties.
• To investigate the mechanism of action of these compounds against E. coli.
• To explore the potential of crown ethers in enhancing existing disinfectant efficacy.

Main Methods:

• Synthesis of novel crown ether compounds (C7Te and C7TeO).
• Antibacterial assays against Gram-negative E. coli (BL21).
• Assessment of biofilm inhibition and disruption capabilities.
• Computer modeling of crown ether interaction with bacterial cell membrane models (nanodiscs).

Main Results:

• C7Te and C7TeO demonstrated antibacterial effectiveness against E. coli.
• C7Te enhanced E. coli inhibition and biofilm prevention mediated by hydrogen peroxide (H2O2) via a redox response.
• C7Te effectively disrupted preformed E. coli biofilms by penetrating barriers.
• Computer modeling showed C7Te insertion into and disruption of bacterial cell membranes, leading to cell death.

Conclusions:

• Redox-responsive crown ethers represent a novel class of antibacterial agents.
• C7Te can augment the efficacy of H2O2-based disinfectants against E. coli.
• Crown ether interaction with bacterial membranes offers a new mechanism for antimicrobial therapy.