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Polarizable atomic multipole-based force field for cholesterol.

Yan Li1, Ye Liu1, Boya Yang2

  • 1Laboratory of Molecular Modeling and Design, State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, Liaoning, China.

Journal of Biomolecular Structure & Dynamics
|August 11, 2023
PubMed
Summary
This summary is machine-generated.

We developed a new polarizable force field for simulating cholesterol in lipid bilayers. Molecular dynamics simulations using this force field accurately reproduce experimental structural properties of phospholipid bilayers with cholesterol.

Keywords:
CholesterolMD simulationpolarizable force field

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Area of Science:

  • Biophysics
  • Computational Chemistry
  • Materials Science

Background:

  • Cholesterol is a vital lipid component in cell membranes, influencing membrane structure and function.
  • Accurate molecular simulations require precise force fields that capture electronic properties.
  • Existing force fields may not fully represent the complex electronic interactions of cholesterol.

Purpose of the Study:

  • To develop and validate a polarizable atomic multipole force field (FF) for molecular dynamics (MD) simulations of cholesterol.
  • To apply the FF to simulate phospholipid bilayers containing cholesterol at various concentrations.
  • To assess the accuracy of the FF by comparing simulation results with experimental data.

Main Methods:

  • The force field was built using the atomic multipole optimized energetics for biomolecular applications (AMOEBA) framework.
  • Electronic parameters (monopole, dipole, quadrupole moments, polarizabilities) were derived from ab initio calculations.
  • Molecular dynamics simulations were performed on bilayers of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) with varying cholesterol concentrations.

Main Results:

  • The proposed polarizable FF was validated through statistical analysis of simulation results.
  • Calculated structural properties of the lipid bilayers showed agreement with experimental trends.
  • MD simulations demonstrated the feasibility of the new force field for cholesterol-containing membranes.

Conclusions:

  • The developed polarizable atomic multipole force field provides a reliable tool for simulating cholesterol in lipid bilayers.
  • The FF accurately captures the structural behavior of phospholipid bilayers with cholesterol.
  • This advancement enables more precise computational studies of membrane biophysics and cholesterol's role.