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Glycolipid transfer protein interaction with bilayer vesicles: modulation by changing lipid composition
Chetan S Rao1, Taeowan Chung, Helen M Pike
1University of Minnesota, Hormel Institute, Austin, Minnesota 55912, USA.
Biophysical Journal
|September 20, 2005
Summary
Glycolipid transfer protein (GLTP) interacts with cell membranes, with its partitioning influenced by ionic strength and lipid composition. Conditions reducing GLTP binding diminish transfer activity, impacting its use in modulating membrane GSLs.
Area of Science:
- Biochemistry
- Cell Biology
- Membrane Biophysics
Background:
- Glycosphingolipids (GSLs) are crucial for cell development and pathogen adhesion.
- Modulating GSLs in lipid rafts is a therapeutic strategy.
- Glycolipid transfer protein (GLTP) facilitates GSL transfer between membranes.
Purpose of the Study:
- To understand how cell membranes regulate GLTP activity.
- To analyze GLTP partitioning to membranes.
- To develop a model for GLTP-membrane interactions.
Main Methods:
- Fluorescence resonance energy transfer (FRET) to monitor GLTP partitioning.
- Lipid monolayer surface pressure measurements to assess interaction penetration.
- Anisotropy measurements of fluorescent probes to evaluate membrane fluidity and order.
Main Results:
- GLTP partitions to vesicles even without GSLs.
- GLTP interaction is nonpenetrating and nonperturbing to membrane structure.
- Ionic strength, vesicle packing, and lipid composition influence GLTP partitioning.
- Reduced GLTP binding diminishes GSL transfer activity.
Conclusions:
- GLTP interaction with membranes is regulated by environmental conditions.
- Conditions favoring GLTP binding do not necessarily enhance transfer.
- Understanding GLTP-membrane dynamics is key for its application in GSL modulation.