Peroxidised phospholipid bilayers: insight from coarse-grained molecular dynamics simulations

Area of Science:

• Biophysics
• Computational Chemistry
• Materials Science

Background:

• Peroxidised phospholipids are crucial in biological membranes, but their behavior is complex.
• Accurate molecular models are needed to understand their mechanical and structural properties.
• Existing models may not fully capture the nuances of peroxidised lipid bilayers.

Purpose of the Study:

• To develop an original coarse-grained model for peroxidised phospholipids.
• To validate the model using recent thermodynamic and structural data.
• To predict key mechanical properties and structural features of peroxidised lipid bilayers.

Main Methods:

• Utilized the MARTINI lipid force field as a basis.
• Integrated thermodynamic modeling with structural information on area per lipid.
• Performed simulations to obtain elastic coefficients (compressibility and bending moduli).

Main Results:

• Developed a stable coarse-grained model for peroxidised phospholipids.
• Obtained compressibility and bending moduli, comparing compressibility to experimental data.
• Predicted membrane thickness and the lateral distribution of hydroperoxide groups.

Conclusions:

• The developed coarse-grained model provides a robust framework for studying peroxidised phospholipids.
• The model accurately reproduces key mechanical properties of lipid bilayers.
• This work advances our understanding of membrane mechanics and the role of lipid peroxidation.