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Molecular Dynamics Simulations of the Lipid Bilayer Edge
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Journal Article
Molecular Dynamics Simulations of the Lipid Bilayer Edge
2004
Overview
Phospholipid bilayers have been intensively studied by molecular dynamics (MD) simulation in recent years. The properties of bilayer edges are important in determining the structure and stability of pores formed in vesicles and biomembranes. In this work, we use molecular dynamics simulation to investigate the structure, dynamics, and line tension of the edges of bilayer ribbons composed of pure dimyristoylphosphatidylcholine (DMPC) or palmitoyl-oleoylphosphatidylethanolamine (POPE). As expected, we observe a significant reorganization of lipids at and near the edges. The treatment of electrostatic effects is shown to have a qualitative impact on the structure and stability of the edge, and significant differences are observed in the dynamics and structure of edges formed by DMPC and palmitoyl-oleoylphosphatidylethanolamine. From the pressure anisotropy in the simulation box, we calculate a line tension of ∼10–30 pN for the DMPC edge, in qualitative agreement with experimental estimates for similar lipids.
Publisher
Elsevier Inc,Biophysical Society
