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Membrane Domains

Membrane Domains

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.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...

Mechanisms of Membrane Domain Formation

Mechanisms of Membrane Domain Formation

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.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...

Protein Diffusion in the Membrane

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...

Diffusion

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...

Diffusion

Diffusion

Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...

Membrane Fluidity

Membrane Fluidity

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
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...

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Related Experiment Video

Updated: May 22, 2026

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells

Published on: November 12, 2020

Membrane microdomains emergence through non-homogeneous diffusion.

Hédi A Soula¹, Antoine Coulon, Guillaume Beslon

¹Université de Lyon Inserm UMR1060, F-69621, Villeurbanne Cédex, France. hedi.soula@insa-lyon.fr.

|May 2, 2012

Summary

This summary is machine-generated.

Cell membrane proteins concentrate in low-viscosity areas due to diffusion variations, not just random motion. This explains protein-lipid raft colocalization and impacts particle clustering.

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Last Updated: May 22, 2026

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells

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Published on: November 12, 2020

From Fast Fluorescence Imaging to Molecular Diffusion Law on Live Cell Membranes in a Commercial Microscope

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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

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Published on: July 19, 2022

Area of Science:

Cell Biology
Biophysics
Membrane Dynamics

Background:

Classical models assume uniform cell membrane protein diffusion.
Reality shows protein-lipid raft microdomains with specific lipid compositions.
Existing models don't fully explain protein colocalization within these rafts.

Purpose of the Study:

To propose a simple mechanism explaining protein and lipid raft colocalization.
To investigate how membrane viscosity variations affect protein distribution.
To explore the impact of diffusion heterogeneity on particle interactions and clustering.

Main Methods:

Utilized simple mathematical models.
Performed particle simulations.
Analyzed diffusion coefficients and particle interactions.

Main Results:

Membrane viscosity variations directly alter local concentrations of diffusive particles.
Proteins concentrate in membrane areas with lower diffusion coefficients (higher viscosity).
Inhomogeneous diffusion impacts particle clusterization, increasing cluster formation in low-diffusion zones.

Conclusions:

Stable membrane viscosity heterogeneity offers a simple mechanism for particle concentration heterogeneity.
This heterogeneity influences particle density and clustering, especially with added interactions.
Findings suggest implications for membrane chemical reactions and protein oligomerization.