Motional Coherence in Fluid Phospholipid Membranes

Details Motional Coherence in Fluid Phospholipid Membranes Motional Coherence in Fluid Phospholipid Membranes

2008-09-18

arxiv.org/abs/0809.3040v1

Phys. Rev. Lett. 101, 248106 (2008) (4 pages)

Physics

Biological Physics

Scientific paper

10.1103/PhysRevLett.101.248106

We report a high energy-resolution neutron backscattering study, combined with in-situ diffraction, to investigate slow molecular motions on nanosecond time scales in the fluid phase of phospholipid bilayers of 1,2-dimyristoyl-sn-glycero-3-phoshatidylcholine (DMPC) and DMPC/40% cholesterol (wt/wt). A cooperative structural relaxation process was observed. From the in-plane scattering vector dependence of the relaxation rates in hydrogenated and deuterated samples, combined with results from a 0.1 microsecond long all atom molecular dynamics simulation, it is concluded that correlated dynamics in lipid membranes occurs over several lipid distances, spanning a time interval from pico- to nanoseconds.

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