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Cracking donuts and sorting lipids: Geometry controls archaeal membrane stability and lipid organization
Felix Frey1, Miguel Amaral1, Anđela Šarić1
1Institute of Science and Technology Austria, Klosterneuburg, Austria.
The Journal of Chemical Physics
|April 8, 2026
Summary
Archaeal cell membranes, unlike others, use unique lipids to form monolayers. These rigid membranes resist shape changes, unlike softer bilayers, revealing how lipid structure impacts membrane remodeling.
Area of Science:
- Biophysics
- Cell Biology
- Biochemistry
Background:
- Cell membranes define life and vary across domains.
- Archaea uniquely utilize bilayer lipids and double-headed bolalipids.
- Bolalipids' conformations influence membrane structure (bilayer or monolayer).
Purpose of the Study:
- Explore physical principles of archaeal membranes.
- Investigate how membrane structure couples to external curvature.
- Understand membrane remodeling in archaea.
Main Methods:
- Coarse-grained molecular dynamics simulations.
- Simulated toroidal vesicles under varying curvatures.
- Analyzed shape stability and lipid organization.
Main Results:
- Soft bilayer membranes accommodate all induced curvatures.
- Rigid bolalipid monolayer membranes either change shape or rupture.
- U-shaped bolalipids and bilayer lipids accumulate at high mean curvature regions.
Conclusions:
- Curvature-composition coupling is a key feature of archaeal membrane remodeling.
- Archaeal membrane rigidity influences response to physical stress.
- Lipid structure dictates membrane adaptability and stability.
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