Related Experiment Video
Updated: Jul 5, 2026
Imaging Protein-protein Interactions in vivo
Published on: October 10, 2010
Imaging protein-protein interactions by Fluorescence Resonance Energy Transfer (FRET) microscopy
Fred S Wouters1, Philippe I H Bastiaens
1Imperial Cancer Research Fund, London, United Kingdom.
Insights
Fluorescence Resonance Energy Transfer (FRET) microscopy offers a sensitive method to detect protein-protein interactions. This technique analyzes proximity between labeled molecules, overcoming limitations of traditional biochemical assays.
Area of Science:
- Biophysics
- Molecular Biology
- Cell Biology
Background:
- Traditional methods like immunoprecipitation and immunoblotting have limitations in detecting specific protein-protein interactions.
- General immunofluorescence methods are sensitive but challenging for inferring direct protein interactions.
Purpose of the Study:
- To detail Fluorescence Resonance Energy Transfer (FRET) microscopy as a sensitive technique for detecting protein-protein interactions.
- To describe FRET microscopy protocols involving acceptor photobleaching and reagent microinjection.
Main Methods:
- Utilizing Fluorescence Resonance Energy Transfer (FRET) microscopy.
- Employing acceptor photobleaching to detect changes in donor fluorescence.
- Performing microinjection of labeled antibodies into cellular compartments (nucleus or cytosol).
Main Results:
- FRET microscopy can detect molecular proximity within single protein molecule distances.
- The method allows for sensitive detection of protein-protein interactions.
- Successful application of FRET microscopy with antibody labeling and microinjection.
Conclusions:
- FRET microscopy provides a powerful tool for studying protein-protein interactions at high sensitivity.
- The described protocols enable the investigation of molecular interactions in living cells.
- This technique overcomes limitations of bulk assays and general immunofluorescence.
Abstract:
Detection of specific protein-protein interactions has long been restricted to bulk biochemical methods such as immunoprecipitation and immunoblotting. Even more sensitive methods using general immunofluorescence are limited, and it is difficult to infer protein-protein interactions from the results of these tests. Fluorescence Resonance Energy Transfer (FRET) is a photophysical process that can be exploited to obtain highly sensitive information about such interactions. It can sense the presence of acceptor fluorophores in the vicinity of a donor fluorophore within a separation distance that is the size of a single protein molecule. This unit details FRET microscopy based on release of quenched donor fluorescence after acceptor photobleaching, microinjection of reagents into the nucleus or cytosol, and labeling of antibodies for these procedures.
Related Concept Videos
01:19Protein Dynamics in Living Cells
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...
01:05Total Internal Reflection Fluorescence Microscopy