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Updated: Aug 12, 2026
10:15
Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
Published on: July 22, 2015
Molecular structure of the lecithin ripple phase
Alex H de Vries1, Serge Yefimov, Alan E Mark
1Molecular Dynamics Group, Department of Biophysical Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands. a.h.de.vries@rug.nl
Summary
Cooling lecithin lipid bilayers causes spontaneous ripple formation. These ripples feature distinct lipid domains and kink regions, offering an atomic-level model for bilayer behavior.
Area of Science:
- Biophysics
- Computational Chemistry
- Materials Science
Background:
- Lipid bilayers are fundamental to cell membranes.
- Understanding lipid phase transitions is crucial for biological and material applications.
- Previous studies lacked atomic-level detail on ripple formation.
Purpose of the Study:
- To investigate the molecular mechanisms behind ripple formation in lecithin lipid bilayers.
- To provide an atomic-level model of the rippled bilayer structure.
Main Methods:
- Molecular dynamics simulations were employed.
- Simulations tracked lecithin lipid bilayers in water.
- Cooling protocols mimicked phase transitions from liquid crystalline to gel phases.
Main Results:
- Spontaneous formation of rippled bilayers observed upon cooling.
- Ripples comprise two domains with differing lipid length and orientation.
- One domain exhibits splayed gel lipid organization; the other shows gel-like, interdigitated lipids.
- Disordered lipid arrangements identified in the concave kink regions.
Conclusions:
- The study provides an atomic-level model for ripple formation in lipid bilayers.
- Results align with existing experimental data.
- The model offers testable predictions for future experimental validation.
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