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Facilitated Diffusion

Facilitated Diffusion

The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...

Facilitated Transport

Facilitated Transport

The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a membrane via...

Facilitated Transport

Facilitated Transport

The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a membrane via...

Restriction Enzymes

Restriction Enzymes

Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...

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...

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Related Experiment Video

Updated: May 23, 2026

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

Published on: October 1, 2017

Facilitated diffusion on confined DNA.

G Foffano¹, D Marenduzzo, E Orlandini

¹School of Physics and Astronomy, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|April 3, 2012

Summary

This summary is machine-generated.

Proteins use facilitated diffusion, combining 3D movement and 1D DNA sliding, to quickly reach targets within cells. This robust mechanism efficiently speeds up reactions in confined environments like yeast chromatin.

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Last Updated: May 23, 2026

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

A Simple, Robust, and High Throughput Single Molecule Flow Stretching Assay Implementation for Studying Transport of Molecules Along DNA

Published on: October 1, 2017

Visualizing Protein-DNA Interactions in Live Bacterial Cells Using Photoactivated Single-molecule Tracking

Visualizing Protein-DNA Interactions in Live Bacterial Cells Using Photoactivated Single-molecule Tracking

Published on: March 10, 2014

Area of Science:

Biophysics
Cell Biology
Molecular Dynamics

Background:

Proteins in living cells utilize a combination of three-dimensional (3D) bulk diffusion and one-dimensional (1D) sliding along DNA to locate target sites efficiently.
This process, termed facilitated diffusion, is crucial for the speed of intracellular biochemical reactions.

Purpose of the Study:

To investigate the dynamics of facilitated diffusion in the context of confined DNA, considering physiological conditions.
To determine the influence of confining geometry and DNA elasticity on the efficiency of facilitated diffusion.

Main Methods:

Computational modeling and simulation of protein dynamics on DNA within confined geometries.
Analysis of the interplay between bulk diffusion, 1D sliding, DNA elasticity, and confinement effects.

Main Results:

Facilitated diffusion is most efficient in isotropic confinement and on flexible DNA polymers.
The speedup achieved through DNA sliding becomes robust and less sensitive to parameter variations at typical intracellular protein concentrations.
The studied parameter range is applicable to both in vitro experiments and facilitated diffusion on yeast chromatin.

Conclusions:

Facilitated diffusion is a robust and efficient mechanism for accelerating intracellular diffusion-limited reactions.
Cellular confinement and DNA flexibility play critical roles in optimizing protein search dynamics.
The findings provide insights into protein-DNA interactions relevant to cellular processes and experimental systems.