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Related Concept Videos

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Fluid Mosaic Model

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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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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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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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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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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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Bottom-up Coarse-Grained Models of Asymmetric Membranes.

Ayan Majumder1, Patrick G Sahrmann1, Gregory A Voth1

  • 1Department of Chemistry, Chicago Center for Theoretical Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago, Chicago, Illinois 60637, United States.

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|September 27, 2025
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Summary

This study introduces a novel bottom-up coarse-grained model for simulating complex biological membranes. The model accurately captures cholesterol

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Area of Science:

  • Membrane Biophysics
  • Computational Biology
  • Statistical Mechanics

Background:

  • Biological membranes exhibit inherent asymmetry with heterogeneous lipid and protein distribution.
  • Simulating realistic membranes is challenging due to computational demands in all-atom modeling and inaccuracies in top-down coarse-grained models.
  • Understanding spatial heterogeneity in membrane bilayers is crucial for membrane biophysics.

Purpose of the Study:

  • To develop a systematic, bottom-up coarse-grained (CG) model for simulating realistic asymmetric biological membranes.
  • To accurately model lipid-lipid and lipid-protein interactions using statistical mechanics.
  • To investigate cholesterol behavior and lipid interactions within asymmetric bilayers, mimicking the HIV-1 virion membrane.

Main Methods:

  • Constructed a "bottom-up" coarse-grained (CG) model using a systematic statistical mechanical approach.
  • Validated the model's transferability for various membrane compositions, including capturing the cholesterol condensation effect.
  • Calculated the free energy landscape for interleaflet cholesterol movement in different membrane compositions.

Main Results:

  • The bottom-up CG model accurately simulates asymmetric bilayers and captures the cholesterol condensation effect.
  • Demonstrated rapid cholesterol movement from compressed to expanded leaflets in asymmetric bilayers to alleviate membrane stress.
  • Showed that cholesterol stability in asymmetric bilayers is dependent on leaflet lipid composition, unlike in symmetric bilayers.

Conclusions:

  • This study presents a new paradigm for systematic, bottom-up CG modeling of realistic membranes.
  • The developed model offers insights into lipid interactions and cholesterol dynamics in asymmetric bilayers.
  • The model is transferable and captures key membrane phenomena, advancing membrane biophysics simulations.