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Biophysical Journal 67: 713-719 (1994)
© 1994 the Biophysical Society

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Langevin dynamics of the choline head group in a membrane environment.

P H Konstant, L L Pearce and S C Harvey

Department of Physiology and Biophysics, University of Alabama at Birmingham 35294.

ABSTRACT

Computer simulations of dipalmitoylphosphatidylcholine (DPPC) have been performed using Langevin dynamics and a Marcelja-type mean field. This work has focused on the dynamics of the choline head group to parameterize the empirical constraints against phosphorus-carbon dipolar couplings (Dp-c) as measured by nuclear magnetic resonance (13C-NMR). The results show good agreement with experimental values at constraints equivalent to the choline tilt observed in joint refinement of x-ray diffraction and neutron diffraction scatterings. Quadrupolar splittings for the alpha and beta positions are also calculated and compared with 2H-NMR experiments. The model predicts torsional transition rates around the alpha-beta bonds and for the two C-O-P-O torsions. It also predicts T1 relaxation times for the alpha and beta carbons.






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Copyright © 1994 by the Biophysical Society.