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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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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...
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Facilitated Transport01:19

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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...
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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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.
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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
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Modeling Facilitated Diffusion of Proteins in Crowded Environment.

Shrawan Kumar Choudhary1, Sangeeta1, Pinki Dey2

  • 1School of Computational and Integrative Sciences, Jawaharlal Nehru University, New Delhi, India.

Sub-Cellular Biochemistry
|September 26, 2025
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Summary

Cellular crowding affects how DNA-binding proteins (DBPs) find their targets. This review explores how non-specific interactions and crowding agent properties influence DBP facilitated diffusion along DNA.

Keywords:
Coarse-grained simulationDepletion layerFacilitated diffusionMacromolecular crowdingProtein-DNA interactions

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Computational Biology

Background:

  • Protein-DNA interactions are essential for cellular functions, involving specific recognition of DNA bases by DNA-binding proteins (DBPs).
  • The cell nucleus is a crowded environment with high biomolecule concentrations, potentially hindering macromolecular diffusion and association.
  • Understanding how DBPs navigate this crowded nucleus to find target DNA sites is crucial for comprehending gene regulation and enzymatic processes.

Purpose of the Study:

  • To review in silico approaches for investigating DNA-binding protein facilitated diffusion in crowded cellular environments.
  • To elucidate the mechanisms by which cellular crowding influences the search dynamics of DBPs on DNA.
  • To differentiate the effects of crowding on protein-DNA interactions from those on protein-protein associations.

Main Methods:

  • Literature review of computational (in silico) studies on facilitated diffusion of DBPs.
  • Analysis of simulation data examining the impact of macromolecular crowding on DBP-DNA interactions.
  • Investigation into the role of physicochemical properties of crowding agents on DBP search efficiency.

Main Results:

  • Crowding effects on DBP facilitated diffusion differ from those in protein-protein associations.
  • Volume exclusion alone does not fully explain the influence of crowding on DBP search dynamics.
  • Physicochemical characteristics of crowding agents significantly modulate DBP diffusion and binding efficiency.

Conclusions:

  • Cellular crowding presents unique challenges for DNA-binding proteins seeking specific DNA targets.
  • Facilitated diffusion models must account for non-specific interactions and crowding agent properties for accurate predictions.
  • This research provides insights into the nuclear environment's influence on essential protein-DNA recognition processes.