Analysis of Antimicrobial-Triggered Membrane Depolarization Using Voltage Sensitive Dyes.
J Derk Te Winkel1, Declan A Gray1, Kenneth H Seistrup1
1Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University Newcastle upon Tyne, UK.
Frontiers in Cell and Developmental Biology
|May 6, 2016
Summary
This study introduces a new method to measure bacterial membrane potential changes, crucial for understanding how antimicrobial compounds kill bacteria by disrupting cell membranes. This technique improves upon existing assays by detecting ion permeability changes.
Area of Science:
- Microbiology
- Biochemistry
- Pharmacology
Background:
- Bacterial cytoplasmic membrane disruption is a key antimicrobial mechanism.
- Current permeability assays miss crucial ion flux changes.
- Membrane depolarization is a significant bacterial killing mechanism.
Purpose of the Study:
- To provide experimental guidance for assessing bacterial membrane potential in vivo.
- To optimize protocols for kinetic measurements of membrane potential.
- To introduce single-cell analysis of membrane potential using voltage-sensitive dyes.
Main Methods:
- In vivo assessment of bacterial membrane potential.
- Optimized protocols for qualitative and quantitative kinetic measurements.
- Single-cell analysis using voltage-sensitive dyes and fluorescence microscopy.
Main Results:
- Accurate assessment of membrane potential changes induced by antimicrobials is achievable in vivo.
- Optimized protocols enable sensitive detection of membrane depolarization.
- Single-cell analysis provides detailed insights into antimicrobial action.
Conclusions:
- Accurate measurement of bacterial membrane potential is essential for mode of action studies.
- The presented methods enhance the analysis of membrane-targeting antimicrobials.
- Voltage-sensitive dyes offer a powerful tool for studying bacterial membrane dynamics.
