Cholesterol shows preference for the interior of polyunsaturated lipid membranes.

Abstract

Recent neutron scattering experiments showed a striking manifestation of the aversion between polyunsaturated fatty acid (PUFA)-containing lipids and cholesterol. Selectively deuterated cholesterol/ 1,2-diarachidonylphosphatidylcholine (DAPC) samples revealed that the hydroxyl of the sterol resides at the center of the bilayer. Here we use a recently parametrized coarse grain simulation model to shed light on these puzzling experimental observations. Using a simulation setup in close correspondence to the experimental conditions, we reproduce the experimental neutron scattering profiles to a large extent. The simulations allow us to analyze the behavior of cholesterol in detail; we show that the interaction of cholesterol with the PUFA chains of DAPC leads to a fast flip-flop rate for the sterol and an increased preference of the sterol for the unusual location embedded between the monolayer leaflets.

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@article{Marrink2008CholesterolSP, title={Cholesterol shows preference for the interior of polyunsaturated lipid membranes.}, author={Siewert J. Marrink and Alex H. de Vries and Thad A Harroun and John Katsaras and Stephen R. Wassall}, journal={Journal of the American Chemical Society}, year={2008}, volume={130 1}, pages={10-1} }