Abstract
Molecular dynamics simulations of lipid bilayers in aqueous systems reveal how an applied electric field stabilizes the reorganization of the water–membrane interface into water-filled, membrane-spanning, conductive pores with a symmetric, toroidal geometry. The pore formation process and the resulting symmetric structures are consistent with other mathematical approaches such as continuum models formulated to describe the electroporation process. Some experimental data suggest, however, that the shape of lipid electropores in living cell membranes may be asymmetric. We describe here the axially asymmetric pores that form when mechanical constraints are applied to selected phospholipid atoms. Electropore formation proceeds even with severe constraints in place, but pore shape and pore formation time are affected. Since lateral and transverse movement of phospholipids may be restricted in cell membranes by covalent attachments to or non-covalent associations with other components of the membrane or to membrane-proximate intracellular or extracellular biomolecular assemblies, these lipid-constrained molecular models point the way to more realistic representations of cell membranes in electric fields.
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Acknowledgements
Computational resources were provided by the Centro de Cómputos de Alto Rendimiento (CeCAR) - Facultad de Ciencias Exactas y Naturales – UBA and ITBA. PTV was supported by the Frank Reidy Research Center for Bioelectrics and by the Air Force Office of Scientific Research (FA9550-14-1-0123 and MURI grant FA9550-15-1-0517 on “Nanoelectropulse-Induced Electromechanical Signaling and Control of Biological Systems,” administered through Old Dominion University). MLF and MR were supported in part by grants from Universidad de Buenos Aires (UBACyT GC 20620130100027BA), CONICET (PIP GI 11220110100379) and ITBA (ITBACyT 2015), and MR received additional support from IBM of Argentina. MLF and MR gratefully acknowledge the guidance of Professor G. Marshall.
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Fernández, M.L., Risk, M.R. & Vernier, P.T. Electropore Formation in Mechanically Constrained Phospholipid Bilayers. J Membrane Biol 251, 237–245 (2018). https://doi.org/10.1007/s00232-017-0002-y
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DOI: https://doi.org/10.1007/s00232-017-0002-y