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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
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Quantitative single molecule FRET efficiencies using TIRF microscopy.

Lasse L Hildebrandt1, Søren Preus, Victoria Birkedal

  • 1Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, Denmark. vicb@inano.au.dk.

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|September 30, 2015
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Summary
This summary is machine-generated.

This study presents a method for accurate Förster resonance energy transfer (FRET) measurements on single DNA molecules. The technique provides reliable distance information crucial for understanding molecular dynamics without external calibration.

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Area of Science:

  • Biophysics
  • Single-molecule imaging
  • Fluorescence microscopy

Background:

  • Förster resonance energy transfer (FRET) microscopy at the single molecule level offers insights into molecular distances (2-10 nm) and conformational changes.
  • Accurate distance determination requires quantitative, instrument-independent FRET efficiency values.

Purpose of the Study:

  • To apply and evaluate a procedure for determining quantitative FRET efficiencies from single-molecule fluorescence time traces of surface-immobilized DNA.
  • To assess the robustness of this method across a range of FRET efficiencies.

Main Methods:

  • Utilized doubly labeled double-stranded DNA samples with systematically varied acceptor positions.
  • Determined quantitative FRET efficiencies directly from individual fluorescence time traces.
  • Employed tools within the iSMS software for FRET determination and uncertainty assessment.

Main Results:

  • Successfully determined quantitative FRET efficiencies without external calibrants.
  • Demonstrated that direct acceptor excitation contributions are intrinsically accounted for.
  • Identified key experimental parameters influencing quantitative FRET determination.

Conclusions:

  • The developed procedure enables accurate, instrument-independent FRET efficiency determination for single DNA molecules.
  • This method is essential for obtaining precise structural information from biomolecules undergoing conformational changes.
  • Guidelines and software tools are provided for practical implementation and uncertainty assessment.