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Related Concept Videos

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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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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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Raft-like lipid mixtures in the highly coarse-grained Cooke membrane model.

Malavika Varma1, Farid Khuri-Makdisi1, Markus Deserno1

  • 1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.

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|September 16, 2024
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Summary

This study enhances a lipid model to simulate lipid rafts, crucial for cell membrane function. The improved model captures raft thermodynamics and mechanics, aiding research into cellular signaling and trafficking.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Membrane Biophysics

Background:

  • Lipid rafts are essential membrane microdomains involved in cellular processes.
  • Current models struggle to capture the complex physical properties of plasma membranes, including asymmetry and mechanical stresses.
  • Ternary lipid mixtures are used as proxies but lack comprehensive representation of raft dynamics.

Purpose of the Study:

  • To extend the Cooke lipid model to incorporate raft-like liquid-ordered/liquid-disordered (lo/ld) mixing thermodynamics.
  • To investigate the influence of cholesterol on lipid raft formation, phase behavior, and membrane mechanics.
  • To provide a model capable of simulating biologically relevant membrane phenomena over extended length and time scales.

Main Methods:

  • Extension of the highly coarse-grained Cooke model for lipids.
  • Incorporation of lo/ld phase coexistence thermodynamics, including critical point behavior.
  • Analysis of membrane elasticity and lipid diffusion in both phase-separated and homogeneous systems.

Main Results:

  • The enhanced Cooke model accurately captures the shape and tie lines of the lo/ld coexistence region, which narrows with cholesterol addition.
  • Cholesterol addition leads to a critical point and alters the properties of coexisting phases, reflecting differences in lipid order and packing.
  • Changes in membrane elasticity and lipid diffusion upon cholesterol addition were quantified for different lipid compositions.

Conclusions:

  • The extended Cooke model provides a powerful tool for studying lipid raft formation and phase separation in complex, asymmetric membranes.
  • This model enables deeper insights into the physical basis of raft-dependent cellular processes, particularly for plasma membranes with distinct leaflet properties.
  • The findings facilitate understanding of how membrane mechanics and lipid composition interplay in cellular signaling and trafficking.