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Single Molecule Methods for Monitoring Changes in Bilayer Elastic Properties
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Published on: November 3, 2008

Assessing smectic liquid-crystal continuum models for elastic bilayer deformations.

Kyu Ii Lee1, Richard W Pastor, Olaf S Andersen

  • 1Department of Molecular Biosciences and Center for Bioinformatics, The University of Kansas, Lawrence, KS 66047, USA.

Chemistry and Physics of Lipids
|January 26, 2013
PubMed
Summary

Continuum elastic models (CEMs) may not accurately capture protein-lipid interactions in bilayer deformations. Comparing CEMs with molecular dynamics simulations reveals discrepancies, especially near membrane proteins.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Materials Science

Background:

  • Continuum elastic models (CEMs) have been used for decades to study protein-induced lipid bilayer deformations.
  • CEMs assume protein-lipid interactions are captured by parameters from protein-free bilayers and boundary conditions.

Purpose of the Study:

  • To evaluate the accuracy of CEMs in representing protein-lipid interactions.
  • To investigate how boundary conditions and moduli profiles affect predicted lipid bilayer thickness around membrane proteins.

Main Methods:

  • Review of general CEM structure.
  • Analysis of bilayer thickness profiles around gramicidin A (gA) and VDAC using CEMs with varying parameters.
  • Comparison of CEM predictions with all-atom molecular dynamics simulations.

Main Results:

  • CEMs show qualitative differences in lipid bilayer thickness profiles within the first lipid shell compared to simulations.
  • CEMs do not fully capture local changes in lipid bilayer dynamics induced by proteins.

Conclusions:

  • CEMs may not accurately represent the consequences of protein-induced local changes in lipid bilayer dynamics.
  • Caution is advised when interpreting CEM-based analyses of lipid bilayer-membrane protein interactions.