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This study eliminates the spurious zero-FRET population in single-molecule Förster resonance energy transfer (smFRET) experiments. A novel strategy using Trolox and dual-labeled DNA strands improves the accuracy of smFRET measurements for low-FRET systems.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Spectroscopy

Background:

  • Single-molecule Förster resonance energy transfer (smFRET) is crucial for studying biomolecular dynamics.
  • Spurious zero-FRET populations can lead to inaccurate interpretations, especially in low-FRET systems.
  • Confocal microscopy is a common platform for smFRET measurements.

Purpose of the Study:

  • To identify and address the causes of spurious zero-FRET populations in smFRET.
  • To develop a strategy for accurate smFRET measurements in low-FRET systems.
  • To enhance the reliability of smFRET data obtained via confocal microscopy.

Main Methods:

  • Utilized a model system of duplex DNA for smFRET experiments.
  • Investigated the contributions of acceptor dye triplet states and donor-only strands to zero-FRET.
  • Employed Trolox as a triplet-state quencher.
  • Developed a dual-labeling strategy on the same DNA strand.

Main Results:

  • Identified acceptor dye dark triplet states and incomplete hybridization as key contributors to zero-FRET.
  • Demonstrated that Trolox effectively quenches the acceptor dye triplet state.
  • Showed that dual-labeling eliminates donor-only strands.
  • Successfully eliminated the zero-FRET population in low-FRET DNA constructs.

Conclusions:

  • The combined strategy effectively removes zero-FRET populations, enhancing smFRET accuracy.
  • This approach enables reliable smFRET measurements even for intrinsically low-FRET systems.
  • Facilitates high-accuracy smFRET studies using standard confocal microscopy setups.