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Caging and Photoactivation in Single-Molecule Förster Resonance Energy Transfer Experiments
Atieh Aminian Jazi1,2, Evelyn Ploetz1, Muhamad Arizki1
1Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Biochemistry
|April 1, 2017
Summary
We introduce "caged FRET," a novel method using caged cyanine and rhodamine dyes for single-molecule Förster resonance energy transfer (smFRET) studies. This technique enables temporal control over fluorescence signals, allowing analysis of complex biomolecular interactions.
Area of Science:
- Biophysics
- Chemical Biology
- Molecular Imaging
Background:
- Caged organic fluorophores are vital for super-resolution imaging, enabling controlled fluorescence activation.
- Existing methods involve chemical reduction or UV light for signal ON switching.
Purpose of the Study:
- To establish a "caged FRET" methodology for single-molecule Förster resonance energy transfer (smFRET) with freely diffusing molecules.
- To enable temporal separation and sorting of multiple intramolecular donor-acceptor pairs in solution-based smFRET.
- To apply this technique to study complex biochemical species like multisubunit proteins and nucleic acids.
Main Methods:
- Development of caged cyanine fluorophores and caged rhodamine dyes.
- Utilizing chemical caging and UV reactivation for temporal control of fluorescence signals.
- Application in solution-based smFRET experiments with freely diffusing molecules.
Main Results:
- Demonstrated proof-of-principle experiments for caged FRET.
- Characterized the uncaging process within the confocal volume.
- Showcased temporal uncoupling of convoluted fluorescence signals from spectrally similar labels on nucleic acids.
- Successfully removed overlabeled species in experiments with the BetP transporter using caging without UV reactivation.
Conclusions:
- Caged FRET provides a powerful tool for analyzing complex biomolecular systems with multiple fluorescent labels.
- The methodology allows temporal decoupling of fluorescence signals, overcoming limitations of conventional smFRET.
- Potential applications include studying weak biochemical interactions at low biomolecule concentrations.