Lipid Bilayer Membrane Perturbation by Embedded Nanopores: A Simulation Study.

Area of Science:

• Biophysics
• Computational Biology
• Materials Science

Background:

• Macromolecular nanopores embedded in lipid bilayers can disrupt the bilayer's organization.
• Understanding these perturbations is crucial for various biological and technological applications.

Purpose of the Study:

• To systematically investigate the structural and dynamic alterations in lipid bilayers induced by different types of nanopores.
• To elucidate how nanopore geometry and surface properties influence lipid behavior.

Main Methods:

• Employed molecular dynamics simulations to model lipid bilayer interactions with three classes of nanopores: carbon nanotubes, cyclic peptide nanotubes, and a beta-barrel protein model.
• Analyzed spatial distributions of lipid properties (density, thickness, vector orientation, diffusion) as a function of distance from the nanopore.

Main Results:

• Observed periodic spatial distributions of lipid properties around nanopores.
• Demonstrated undulatory behavior in lipid density, bilayer thickness, lipid vector projection, and lateral diffusion coefficients near carbon nanotube nanopores.
• Highlighted distinct lipid adaptations to different nanopore structures.

Conclusions:

• Lipid bilayer structure and dynamics exhibit local adaptation in response to embedded nanopore geometry and surface characteristics.
• The nature of the macromolecule forming the nanopore significantly influences the surrounding lipid environment.