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Structural changes induced by Triton X-100 on sonicated phosphatidylcholine liposomes
M A Urbaneja1, F M Goñi, A Alonso
1Department of Biochemistry, Faculty of Science, University of the Basque County, Bilbao, Spain.
European Journal of Biochemistry
|May 2, 1988
Summary
Triton X-100 solubilizes small vesicles by forming mixed micelles and large liposomes. Further detergent addition solubilizes these liposomes, revealing a complex lipid-detergent interaction.
Area of Science:
- Biochemistry
- Physical Chemistry
- Materials Science
Background:
- Unilamellar vesicles are model systems for cell membranes.
- Triton X-100 is a non-ionic detergent commonly used in biochemistry.
- Understanding detergent-lipid interactions is crucial for membrane protein studies.
Purpose of the Study:
- To investigate the complex process of unilamellar vesicle solubilization by Triton X-100.
- To characterize the distribution of lipids and detergent at different concentrations.
- To elucidate the formation of mixed micelles and multilamellar liposomes.
Main Methods:
- Sonicated unilamellar vesicles were treated with Triton X-100.
- Lipid and detergent distribution was measured.
- The formation of mixed micelles and multilamellar liposomes was analyzed.
Main Results:
- Solubilization begins at low detergent concentrations, unlike with larger vesicles.
- Simultaneous formation of large multilamellar liposomes occurs.
- At a 1:1 lipid:detergent ratio, one-third of lipids form mixed micelles, while two-thirds form detergent-free liposomes.
- Higher detergent concentrations lead to complete liposome solubilization.
Conclusions:
- The solubilization of small vesicles by Triton X-100 is a multi-step process.
- Lipid and detergent distribution is concentration-dependent.
- The formation of both mixed micelles and multilamellar liposomes is a key feature of this interaction.