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Trehalose maintains phase separation in an air-dried binary lipid mixture
Josette V Ricker1, Nelly M Tsvetkova, Willem F Wolkers
1Section of Molecular and Cellular Biology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA. jvricker@ucdavis.edu
Biophysical Journal
|April 30, 2003
Summary
Trehalose protects dry lipid membranes by fluidizing components and forming direct interactions. This sugar enhances membrane stability, particularly after heating, suggesting a protective effect against dehydration.
Area of Science:
- Biophysics
- Lipid Bilayer Dynamics
- Membrane Stabilization
Background:
- Phospholipids like DLPC and DSPCd-70 are key membrane components.
- Dehydration can alter lipid phase behavior and membrane integrity.
- Trehalose is a disaccharide known for its protective effects on biological systems.
Purpose of the Study:
- Investigate the effects of trehalose on lipid mixtures under hydration and dehydration.
- Characterize the thermal behavior and phase transitions of DLPC:DSPCd-70 mixtures.
- Elucidate the molecular interactions between trehalose and lipid headgroups.
Main Methods:
- Fourier transform infrared (FTIR) spectroscopy was used to analyze lipid mixtures.
- Hydrated and air-dried lipid mixtures (DLPC:DSPCd-70, 1:1) were studied.
- Samples were analyzed with and without trehalose, including heat annealing.
Main Results:
- Air-dried DLPC:DSPCd-70 mixtures showed multiple phase transitions.
- Trehalose induced distinct phase transitions in DLPC and DSPCd-70 components.
- Annealing with trehalose reduced transition temperatures and indicated stronger lipid-sugar interactions.
Conclusions:
- Trehalose exhibits a fluidizing effect on DLPC during drying, intensifying with heat.
- Direct interactions between trehalose and lipid headgroups are responsible for its strong effect.
- Trehalose offers a protective effect on dry lipid membranes through these interactions.