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Spontaneous Formation and Rearrangement of Artificial Lipid Nanotube Networks as a Bottom-Up Model for Endoplasmic Reticulum
Published on: January 22, 2019
Domain shapes, coarsening, and random patterns in ternary membranes
Mikkel Herholdt Jensen1, Eliza J Morris, Adam Cohen Simonsen
1Department of Physics, Boston University, Boston, MA 02215, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 26, 2007
Summary
Interactions with support surfaces create irregular domains in ternary membranes. Doubly supported membranes eliminate these issues, forming stable, round domains suitable for raft modeling and thermodynamic studies.
Area of Science:
- Membrane biophysics
- Soft matter physics
- Materials science
Background:
- Ternary membranes are used as raft models for fluid phase separation.
- Membrane-support interactions can significantly alter domain morphology.
- Understanding domain formation is crucial for biomembrane and materials applications.
Purpose of the Study:
- Investigate domain formation in singly and doubly supported ternary membranes.
- Characterize the influence of membrane-support interactions on domain shape and stability.
- Quantify domain coarsening kinetics and spatial patterns.
Main Methods:
- Atomic Force Microscopy (AFM) and fluorescence microscopy.
- Utilized singly and doubly supported ternary membrane systems.
- Analysis of domain morphology, size, and spatial distribution (Voronoi polygons).
Main Results:
- Singly supported membranes showed small, irregular, and incompletely formed large domains due to support interactions.
- Doubly supported membranes at physiological salt concentrations yielded large, round domains.
- Domain coarsening exponent alpha = 0.31 was determined, closely matching the theoretical 1/3.
- Spatial domain patterns resembled equilibrated cellular structures.
Conclusions:
- Decoupling membranes from support surfaces is essential for controlled domain formation.
- Doubly supported membranes provide a robust platform for studying membrane raft dynamics.
- The observed domain patterns and kinetics align with theoretical predictions for phase-separated lipid systems.
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