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Updated: Jun 10, 2026
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Fission Yeast as a Platform for Antibacterial Drug Screens Targeting Bacterial Cytoskeleton Proteins
Published on: April 26, 2024
Use of model micro-organism to study cytostatics-membrane interactions
P C Luxo1, A S Jurado, L M Almeida
1Laboratório de Microbiologia, Universidade de Coimbra, 3049 Coimbra Codex, Portugal.
Summary
Tamoxifen drug inhibits bacterial growth by altering cell membranes. Calcium ions and temperature affect this inhibition, showing complex drug-membrane interactions.
Area of Science:
- Microbiology
- Biochemistry
- Membrane Biophysics
Background:
- Tamoxifen is a drug with known effects on eukaryotic cells.
- Its interaction with bacterial cell membranes is not well understood.
- Bacillus stearothermophilus serves as a model organism for studying bacterial physiology.
Purpose of the Study:
- To investigate the effects of tamoxifen on the cell membrane of Bacillus stearothermophilus.
- To understand the concentration-dependent inhibition of bacterial growth by tamoxifen.
- To explore the influence of temperature and calcium ions on tamoxifen's efficacy.
Main Methods:
- Bacterial growth inhibition assays were performed at various temperatures.
- Liposome preparations were used to study direct membrane interactions.
- Changes in membrane structural order were measured using biophysical techniques.
Main Results:
- Tamoxifen inhibited Bacillus stearothermophilus growth in a dose-dependent manner.
- Growth inhibition was exacerbated at suboptimal and supraoptimal temperatures.
- Calcium ions (Ca2+) attenuated the inhibitory effect of tamoxifen.
- Tamoxifen increased membrane structural order in vivo but decreased it in vitro liposomes.
Conclusions:
- Tamoxifen exhibits antibacterial properties by disrupting bacterial cell membranes.
- Temperature and Ca2+ modulate tamoxifen's antibacterial activity.
- The observed opposing effects on membrane order suggest complex interactions influenced by the cellular environment.
