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Updated: Aug 8, 2026
Imaging Protein-protein Interactions in vivo
Published on: October 11, 2010
Using live FRET imaging to reveal early protein-protein interactions during T cell activation
Tomasz Zal1, Nicholas R J Gascoigne
1Department of Immunology, The Scripps Research Institute, La Jolla, California 92037, USA. tzal@scripps.edu
Insights
Understanding protein interactions in living cells is crucial for lymphocyte biology. Fluorescence Resonance Energy Transfer (FRET) imaging offers dynamic insights into molecular proximity, advancing T cell receptor studies.
Area of Science:
- Proteomics
- Lymphocyte Biology
- Cellular Dynamics
Background:
- Understanding dynamic protein-protein interactions within living cells is a key challenge in proteomics and lymphocyte biology.
- The molecular dynamics of the T cell receptor-CD3 complex and other immunoreceptors in immune synapses are of particular interest.
Purpose of the Study:
- To highlight Fluorescence (or Förster) Resonance Energy Transfer (FRET) as a technique for studying dynamic molecular proximity.
- To discuss advancements in real-time FRET imaging and its extension to in vivo applications.
Main Methods:
- Utilizing spectral changes in fluorescence intensity for FRET analysis.
- Employing modulation of donor lifetime as a FRET indicator.
- Applying two-photon excitation for in vivo FRET imaging.
Main Results:
- FRET provides dynamic information on nanometer-range molecular proximity, surpassing traditional co-localization methods.
- Real-time FRET imaging approaches are rapidly developing.
- FRET is now extendable to in vivo imaging through two-photon excitation.
Conclusions:
- FRET is a powerful technique for investigating dynamic molecular interactions in cellular contexts.
- Advancements in FRET imaging enable real-time and in vivo studies of crucial biological processes.
- This technique is vital for advancing our understanding of lymphocyte function and immunoreceptor dynamics.
Abstract:
The emerging challenge for proteomics in general and lymphocyte biology in particular is to understand protein-protein interactions in the dynamic context of the living cell. Particularly interesting are the molecular dynamics of the T cell receptor-CD3 complex and other immunoreceptors in immune synapses. Fluorescence (or Förster) resonance energy transfer (FRET) is one of the few techniques that are capable of giving dynamic information about the nanometer-range proximity between molecules, as opposed to simply the subcellular co-localization that is provided by fluorescence microscopy. Spectral changes in fluorescence intensity and down modulation of donor lifetime are the basis for rapidly developing approaches to real-time FRET imaging. With two-photon excitation, FRET can now be extended to in vivo imaging.
