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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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CHARMM GUI Membrane Builder for oxidized phospholipid membrane modeling and simulation.

Turner P Brown1, Dane E Santa2, Brett A Berger2

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|April 10, 2024
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Oxidized phospholipids (oxPLs) alter cell membrane properties, influencing immune responses and disease progression. Understanding oxPL behavior aids in developing treatments for conditions like atherosclerosis and cancer.

Keywords:
MembraneMolecular dynamics simulationMolecular modelingOxidized phospholipid

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Area of Science:

  • Biochemistry
  • Biophysics
  • Computational Biology

Background:

  • Oxidative stress generates oxidized phospholipids (oxPLs).
  • oxPLs modify cell membrane biophysical properties.
  • oxPL-dependent mechanisms are implicated in chronic kidney disease, atherosclerosis, diabetes, and cancer metastasis.

Purpose of the Study:

  • To review experimental and computational studies on oxPL behavior in lipid bilayers.
  • To investigate how oxPL structure impacts membrane properties.
  • To explore methods for stabilizing oxidized membranes and maintaining membrane integrity.

Main Methods:

  • Review of recent experimental studies characterizing oxPL behavior.
  • Analysis of computational studies on oxPL interactions with lipid bilayers.
  • Extension of CHARMM-GUI Membrane Builder to support oxPLs for simulation.

Main Results:

  • oxPLs significantly alter the biophysical properties of phospholipid monolayers and bilayers.
  • Specific oxPL structural features (tail length, polar groups) dictate their membrane impact.
  • Methods for stabilizing oxidized membranes and preserving membrane integrity have been identified.
  • CHARMM-GUI Membrane Builder now supports oxPLs, facilitating simulation system construction.

Conclusions:

  • Understanding oxPL behavior is crucial for targeting diseases driven by oxidative stress.
  • Computational modeling, aided by tools like CHARMM-GUI, accelerates research into oxPL-related mechanisms.
  • Further research into oxPLs can lead to novel therapeutic strategies for various chronic diseases.