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Updated: May 18, 2026

Fluorescent End-Labeling and Encapsulation of Long RNAs for Single-Molecule FRET-TIRF Microscopy
Published on: October 18, 2024
Labeling DNA (or RNA) for single-molecule FRET
This study details a simplified protocol for labeling nucleic acids for single-molecule Förster resonance energy transfer (smFRET) using total internal reflection microscopy. This method enables precise distance measurements in biological studies.
Area of Science:
- Biophysics
- Molecular Biology
- Microscopy
Background:
- Single-molecule fluorescence detection offers insights into biological events without averaging.
- Förster (fluorescence) resonance energy transfer (FRET) measures distances (30-80 Å) via energy transfer between donor and acceptor molecules.
- Total internal reflection (TIR) microscopy is a variant of smFRET.
Purpose of the Study:
- To describe a protocol for labeling nucleic acids (DNA or RNA) for smFRET with TIR microscopy.
- To provide a simplified and optimized method for researchers.
Main Methods:
- Labeling of nucleic acids (DNA/RNA) with amine-modified thymine.
- Utilizing Förster (fluorescence) resonance energy transfer (FRET) in conjunction with total internal reflection (TIR) microscopy.
- Optimization for 5 nanomoles of DNA.
Main Results:
- A detailed protocol for preparing nucleic acid samples for smFRET analysis.
- Demonstration of a simplified labeling procedure.
Conclusions:
- The described protocol facilitates nucleic acid labeling for smFRET with TIR microscopy.
- This method provides a valuable tool for precise molecular distance measurements in biological research.
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