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Related Concept Videos

Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Protein-Protein Interfaces02:04

Protein-Protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

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Related Experiment Video

Updated: May 25, 2026

In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces
07:42

In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces

Published on: March 19, 2010

Visualization of Protein Interactions in Living Cells.

Tomasz Zal1

  • 1Department of Immunology, University of Texas, MD Anderson Cancer Center, Houston TX, USA.

Self/Nonself
|February 3, 2012
PubMed
Summary
This summary is machine-generated.

Studying cell receptor signaling in living cells is challenging. Fluorescence imaging techniques like Förster resonance energy transfer (FRET) offer versatile methods to analyze protein interactions and receptor signaling pathways.

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Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

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Last Updated: May 25, 2026

In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces
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In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces

Published on: March 19, 2010

Visualizing Protein-DNA Interactions in Live Bacterial Cells Using Photoactivated Single-molecule Tracking
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Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
06:48

Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Published on: January 5, 2024

Area of Science:

  • Cell biology
  • Biophysics
  • Molecular signaling

Background:

  • Cell membrane receptors initiate intracellular signaling cascades upon ligand binding.
  • Signal transduction involves complex protein interactions, conformational changes, and kinetic events.
  • In vitro studies face challenges due to the dynamic nature of cellular environments.

Purpose of the Study:

  • To discuss fluorescence imaging techniques for studying protein interactions and receptor signaling in living cells.
  • To highlight the utility of Förster resonance energy transfer (FRET) for proximity and orientation analysis.
  • To explore complementary methods like Fluorescence Correlation Microscopy (FCM) and Bimolecular Fluorescence Complementation (BiFC).

Main Methods:

  • Utilizing Förster resonance energy transfer (FRET) for nanometer-scale proximity and orientation measurements.
  • Employing Fluorescence Correlation Microscopy (FCM) to determine stoichiometry and diffusion kinetics of protein complexes.
  • Applying Bimolecular Fluorescence Complementation (BiFC) and other complementation assays to detect transient protein interactions.

Main Results:

  • FRET provides sensitive detection of molecular interactions within living cells.
  • FCM offers insights into the size and dynamics of molecular assemblies.
  • BiFC and complementation techniques enable visualization of transient protein-protein interactions.

Conclusions:

  • Fluorescence imaging techniques are powerful tools for studying receptor signaling in vivo.
  • Quantitative analysis of imaging data remains crucial for validating signal transduction models.
  • These methods advance our understanding of complex cellular communication pathways.