Biomimetic Electronic Devices for Measuring Bacterial Membrane Disruption.

Area of Science:

• Biophysics
• Materials Science
• Drug Discovery

Background:

• Antibiotic discovery faces significant challenges due to a slowdown in new candidate identification.
• Bacterial membrane disruption is a key mechanism for antibiotic action.
• Phospholipids, the main component of cell membranes, possess insulating properties suitable for electronic detection.

Purpose of the Study:

• To develop and validate a new screening platform for identifying membrane-disrupting antimicrobial compounds.
• To utilize the organic electrochemical transistor (OECT) as a sensitive transducer for monitoring lipid membrane permeability changes.
• To demonstrate the platform's capability in characterizing novel antibacterial agents.

Main Methods:

• An organic electrochemical transistor (OECT) was employed to monitor ion flux across a lipid monolayer at a liquid:liquid interface.
• The OECT served as a transducer to detect changes in membrane permeability induced by compounds.
• The platform was validated using Polymixin B and two novel amine-based oligothioetheramides.

Main Results:

• The OECT successfully detected and quantified changes in lipid monolayer permeability induced by antibacterial compounds.
• The study highlighted the platform's sensitivity in distinguishing molecular-scale differences in membrane disruption capabilities.
• The effectiveness of Polymixin B and two novel oligothioetheramides was demonstrated.

Conclusions:

• The OECT-based platform provides a sensitive and effective method for screening and characterizing antimicrobial compounds that disrupt bacterial membranes.
• This approach leverages the ion-to-electron conversion capabilities of OECTs for high-throughput antimicrobial drug discovery.
• The technology holds potential for advancing front-line antimicrobial compound design and characterization.