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Lipids as Anchors

In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Published on: July 22, 2015

United-atom acyl chains for CHARMM phospholipids.

Jérôme Hénin1, Wataru Shinoda, Michael L Klein

  • 1Center for Molecular Modeling, Department of Chemistry, University of Pennsylvania, 231 S. 34th Street, Philadelphia, PA 19104-6323, USA. jhenin@cmm.chem.upenn.edu

The Journal of Physical Chemistry. B
|May 17, 2008
PubMed
Summary

We developed an implicit-hydrogen model for lipid acyl chains, accelerating membrane simulations by 50% while maintaining accuracy. This hybrid approach enhances computational efficiency for complex lipid bilayer systems.

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Area of Science:

  • Computational chemistry
  • Biophysics
  • Molecular dynamics simulations

Background:

  • All-atom simulations of lipid membranes are computationally intensive due to numerous hydrogen degrees of freedom.
  • Explicit hydrogens in hydrocarbon chains offer limited physical insights but significantly increase simulation costs.

Purpose of the Study:

  • To develop an implicit-hydrogen model for saturated and monounsaturated acyl chains.
  • To complement existing all-atom CHARMM27 models for phospholipid headgroups.
  • To improve the efficiency of lipid bilayer simulations.

Main Methods:

  • Developed a united-atom model for acyl chains, fitting torsional potentials and nonbonded parameters.
  • Validated the model by comparing simulations with an all-hydrogen force field.
  • Performed comparative simulations of fluid-phase 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) bilayers.

Main Results:

  • The implicit-hydrogen model accelerated bilayer simulations by approximately 50%.
  • The model demonstrated minimal sacrifice in detail compared to fully atomistic descriptions.
  • The united-atom model showed energetic compatibility with all-atom CHARMM models.

Conclusions:

  • The proposed implicit-hydrogen model offers a computationally efficient alternative for simulating lipid membranes.
  • This hybrid approach is suitable for large-scale simulations of complex membrane systems.
  • The model balances computational speed with a high degree of accuracy for membrane biophysics research.