Abstract

The assumptions that underlie empirical force field models based on fixed molecular charge densities become questionable in the strongly heterogeneous electrostatic environment of bilayer membranes. Membranes contain regions that are polar (bulk water) highly charged (zwitterionic lipid head groups) and decidedly non-polar (hydrocarbon core). Using a recently developed polarizable Drude oscillator force field for lipids and water we present a study that illustrates the significant role played by electronic polarization effects in the electrostatic modeling of a phospholipid membrane. Specifically, we show that the inclusion of such many-body polarization effects can bring macroscopic electrostatic properties into quantitative precision with experimental observation.

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