Alcohol-Induced Modifications in Bacterial Membrane Lipids
Summary
Bacterial cell membranes are dynamic structures whose integrity and function depend critically on the composition and physical state of their constituent lipids. Exposure to alcohols such as ethanol and butanol perturbs membrane architecture by inserting into the lipid bilayer, disrupting acyl chain packing and increasing fluidity. To counteract this stress, many bacteria remodel their lipidome through modulation of fatty acyl chain length, degree of unsaturation and introduction of cyclopropane rings. These adaptive changes serve to restore optimal membrane order, maintain permeability barriers and preserve the activity of integral proteins. In particular, shifts towards shorter or more saturated chains reduce bilayer fluidity, while cyclopropanation of unsaturated acyl chains confers resistance to alcohol‐induced disorder. Other modifications include altered ratios of phosphatidylethanolamine, phosphatidylglycerol and cardiolipin, as well as changes in minor lipid classes such as plasmalogens. Collectively, these adjustments underpin bacterial survival in the presence of sublethal or inhibitory alcohol concentrations, with implications for industrial fermentation processes, microbial pathogenesis and biotechnological applications that exploit solvent‐tolerant strains.
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Alcohol-Induced Modifications in Bacterial Membrane Lipids publication trend
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Technical terms
Phospholipid: Amphipathic lipid molecule forming the primary bilayer matrix, comprising a glycerol backbone, two fatty acyl chains and a polar headgroup.
Membrane fluidity: A measure of the lateral mobility of lipids within the bilayer, influenced by acyl chain saturation, length and temperature.
Cyclopropanation: The enzymatic conversion of an unsaturated fatty acyl chain into a cyclopropane ring, increasing bilayer order.
Plasmalogen: A vinyl ether–containing phospholipid found in some bacteria, contributing to tighter packing and reduced permeability.
Saturated fatty acid: A fatty acyl chain lacking double bonds, which promotes tighter lipid packing and decreases fluidity.
Unsaturated fatty acid: A fatty acyl chain containing one or more double bonds, which introduces kinks and increases membrane fluidity.
References
- Brain (Na+,K+)-ATPase. Opposite effects of ethanol and dimethyl sulfoxide on temperature dependence of enzyme conformation and univalent cation binding.. Journal of Biological Chemistry (1983).
- Transient Complexity of E. coli Lipidome Is Explained by Fatty Acyl Synthesis and Cyclopropanation. Metabolites (2022).
- Plasmalogens in bacteria, sixty years on. Frontiers in Molecular Biosciences (2022).
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