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High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method
Published on: January 9, 2012
Lipid-ethanol interaction studied by NMR on bicelles
Bernd W Koenig1, Klaus Gawrisch
1Structural Biology Institute, IBI-2, Research Center Jülich, D-52425 Jülich, Germany. b.koenig@fz-juelich.de
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
Ethanol transiently binds to phosphatidylcholine membranes, with about 4% bound at physiological concentrations. This association, lasting nanoseconds, was studied using high-resolution NMR.
Area of Science:
- Biophysics
- Chemical Physics
- Membrane Biophysics
Background:
- Ethanol's interaction with cell membranes is crucial for understanding its biological effects.
- Phospholipids form the basis of biological membranes, and their interaction with small molecules like ethanol is of significant interest.
Purpose of the Study:
- To investigate the transient interaction of ethanol with phospholipid bicelles at physiologically relevant concentrations.
- To determine the orientation, motion, and binding fraction of ethanol within a membrane-like environment.
Main Methods:
- High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy was employed.
- Magnetically aligned bicelles were used to induce anisotropy in the system.
- Residual dipolar couplings and deuterium NMR quadrupole splittings were measured for isotope-labeled ethanol.
Main Results:
- Ethanol exhibits transient association with phosphatidylcholine bicelles, showing a small degree of anisotropy.
- Approximately 4% of ethanol was found to be bound to phosphatidylcholine at 14 wt % lipid concentration and 40°C.
- The lifetime of ethanol association with the membrane was determined to be in the nanosecond range.
Conclusions:
- High-resolution NMR is effective in characterizing the orientation and dynamics of small molecules interacting with membranes.
- Ethanol's interaction with phospholipid membranes is dynamic, involving rapid exchange between free and bound states.
- Understanding ethanol-membrane interactions at a molecular level provides insights into ethanol's pharmacological and toxicological effects.
