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Reconstitution of a Kv Channel into Lipid Membranes for Structural and Functional Studies
Published on: July 13, 2013
The structure of detergent-resistant membrane vesicles from rat brain cells
Xi Chen1, M Jayne Lawrence, David J Barlow
1Pharmaceutical Science Division, King's College London, 150 Stamford Street, London SE1 9NH, UK.
Biochimica Et Biophysica Acta
|January 3, 2009
Summary
Detergent-resistant membranes from rat brain neuronal membranes were analyzed for size and thickness. Conditions like temperature and cations influenced vesicle structure, suggesting 37°C with cations best reflects physiological lipid rafts.
Area of Science:
- Neuroscience
- Biophysics
- Membrane Biology
Background:
- Detergent-resistant membranes (DRMs) are model systems for studying lipid rafts.
- Neuronal plasma membranes contain lipid rafts crucial for cellular function.
- Understanding DRM structure is key to understanding raft composition and dynamics.
Purpose of the Study:
- To determine the size and bilayer thickness of DRMs isolated from rat brain neuronal membranes.
- To investigate the influence of buffer conditions (detergents, cations, temperature) on DRM structure.
- To assess which preparation conditions best mimic physiological lipid raft characteristics.
Main Methods:
- Isolation of DRMs from rat brain neuronal membranes using Triton X-100 or Brij 96.
- Analysis of vesicle size using dynamic light scattering (DLS).
- Determination of bilayer thickness and structural arrangement using small-angle neutron scattering (SANS).
Main Results:
- DLS showed isolated DRMs formed vesicles of approximately 100-200 nm diameter.
- SANS revealed an average bilayer thickness of 4.6-5.0 nm, similar to parental membranes.
- Cations (K+/Mg2+) promoted unilamellar vesicles, while their absence led to mixed structures.
- Membranes prepared at 37°C were slightly thicker than those at 4°C, indicating more ordered lipid phases.
Conclusions:
- DRM size and bilayer thickness are largely consistent across tested conditions.
- Cations and temperature significantly affect the structural organization of DRMs.
- Preparing DRMs at 37°C with cations may provide a more accurate representation of physiological lipid rafts.
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