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Updated: May 6, 2026

Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy
Published on: December 12, 2025
Fluorescence techniques for probing water penetration into lipid bilayers
1Department of Pathology and Cell Biology, Thomas Jefferson University, 19107, Philadelphia, Pennsylvania.
Abstract:
Fluorescence spectroscopy can be used as a highly sensitive and localized probe for hydration in lipid bilayers. Water associates with the head-group region, where it participates in an interlipid network of hydrogen bonds. Deeper in the bilayer, water is contained within acyl-chain packing defects. Fluorescence methodology is available to probe both the interstitial and head-group hydration in lipid bilayers, and results are in good agreement with other techniques. Using fluorescence spectroscopic approaches, cholesterol is shown to dehydrate the acyl-chain region, while hydrating the head-group region. Membrane proteins appear to increase acyl-chain hydration at the protein-lipid interface. Overall fluorescence spectroscopic techniques may be most effective in studying the water content of lipid bilayers and especially of biological membranes.
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