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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
Published on: August 20, 2012
Development of FRET-based assays in the far-red using CdTe quantum dots
E Z Chong1, D R Matthews, H D Summers
1School of Physics and Astronomy, Cardiff University, Cardiff, Wales CF24 3AA, UK.
Journal of Biomedicine & Biotechnology
|February 15, 2008
Summary
This study explores Förster resonance energy transfer (FRET) using biofunctionalized quantum dots (QDs) in the far-red spectrum. Researchers observed FRET between Qdot705-STV and DY731-Bio, noting changes in fluorescence dynamics.
Area of Science:
- Biophotonics
- Quantum Dot Technology
- Spectroscopy
Background:
- Biofunctionalized colloidal quantum dots (QDs) enable Förster resonance energy transfer (FRET) with fluorophores.
- Far-red spectrum (approx. 700 nm) offers advantages for biological imaging by reducing tissue absorption and cell autofluorescence.
Purpose of the Study:
- Investigate FRET between streptavidin-conjugated QDs (Qdot705-STV) and biotinylated DY731-Bio.
- Analyze changes in DY731-Bio absorptivity during streptavidin-biotin binding.
- Compare QD relaxation pathways' influence on FRET dynamics.
Main Methods:
- Utilized a donor-acceptor FRET assay with Qdot705-STV and DY731-Bio.
- Monitored changes in DY731-Bio absorptivity.
- Analyzed fluorescence decay dynamics of QDs with different alloy compositions.
Main Results:
- Observed FRET between Qdot705-STV and DY731-Bio.
- Documented alterations in DY731-Bio absorptivity linked to structural changes upon binding.
- Identified biexponential fluorescence decay in QDs beyond 700 nm, featuring a long-lifetime component (>100 ns).
Conclusions:
- Demonstrated FRET in the far-red region using biofunctionalized QDs.
- Highlighted the impact of QD composition on fluorescence decay and FRET dynamics.
- Provided insights into QD-fluorophore interactions for advanced bioimaging applications.
