期刊
BIOPHYSICAL JOURNAL
卷 85, 期 1, 页码 97-107出版社
CELL PRESS
DOI: 10.1016/S0006-3495(03)74458-0
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资金
- NIGMS NIH HHS [T32 GM008570, T32 GM08570] Funding Source: Medline
Slab geometric boundary conditions are applied in the molecular dynamics simulation of a simple membranechannel system. The results of the simulation were compared to those of an analogous system using normal three-dimensional periodic boundary conditions. Analysis of the dynamics and electrostatics of the system show that slab geometric periodicity eliminates the artificial bulk water orientational polarization that is present while using normal three-dimensional periodicity. Furthermore, even though the water occupancy and volume of our simple channel is the same when using either method, the electrostatic properties are considerably different when using slab geometry. In particular, the orientational polarization of water is seen to be different in the interior of the channel. This gives rise to a markedly different electric field within the channel. We discuss the implications of slab geometry for the future simulation of this type of system and for the study of channel transport properties.
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