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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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...
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Membrane Domains01:18

Membrane 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.
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...
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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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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.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Membrane Fluidity01:26

Membrane Fluidity

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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
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...
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Membrane Fluidity01:23

Membrane Fluidity

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Related Experiment Video

Updated: Mar 29, 2026

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

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Superdiffusive motion of membrane-targeting C2 domains.

Grace Campagnola1, Kanti Nepal2, Bryce W Schroder2

  • 1Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523, USA.

Scientific Reports
|December 8, 2015
PubMed
Summary

Proteins briefly leave the cell membrane to explore bulk solution, a "membrane hop" phenomenon. This hopping enhances protein diffusion and reaction efficiency on membranes.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Protein Dynamics

Background:

  • Peripheral proteins transiently interact with the plasma membrane.
  • Membrane-targeting domains are crucial for recruiting signaling molecules.
  • Protein dissociation and rebinding influence membrane-associated reactions.

Purpose of the Study:

  • Investigate the diffusion of membrane-targeting C2 domains.
  • Analyze the impact of transient membrane interactions on protein behavior.
  • Understand the mechanisms behind enhanced protein exploration of membrane surfaces.

Main Methods:

  • Single-molecule tracking in supported lipid bilayers.
  • Analysis of ensemble-averaged and time-averaged mean square displacement (MSD).
  • Comparison with analytical models and numerical simulations of diffusion.

Main Results:

  • Observed superdiffusive behavior in ensemble-averaged MSD.
  • Time-averaged MSD analysis of individual trajectories showed linear behavior, masking superdiffusion.
  • Experimental data consistent with bulk-mediated diffusion models involving heavy-tailed jump distributions.

Conclusions:

  • Transient protein excursions into bulk solution (membrane hops) enhance diffusion efficiency.
  • Hopping events allow proteins to rapidly explore large membrane areas.
  • This mechanism is critical for optimizing reactions occurring on cell membranes.