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Related Concept Videos

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Related Experiment Video

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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
11:24

High Precision FRET at Single-molecule Level for Biomolecule Structure Determination

Published on: May 13, 2017

Single-molecule FRET with diffusion and conformational dynamics.

Irina V Gopich1, Attila Szabo

  • 1Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

The Journal of Physical Chemistry. B
|October 13, 2007
PubMed
Summary

This study presents a method to analyze conformational dynamics using Förster resonance energy transfer (FRET) on diffusing molecules without complex diffusion modeling. It simplifies data analysis by decomposing FRET efficiency distributions, enabling accurate rate extraction for molecular conformational changes.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Single-Molecule Biophysics

Background:

  • Förster resonance energy transfer (FRET) is a powerful tool for studying molecular dynamics.
  • Analyzing FRET data from diffusing molecules often requires complex modeling of diffusion processes.
  • Extracting conformational dynamics requires robust methods that account for molecular motion.

Purpose of the Study:

  • To develop a simplified method for extracting conformational dynamics from FRET experiments on diffusing molecules.
  • To enable analysis without the need for explicit diffusion modeling.
  • To provide a framework for analyzing FRET data from systems with conformational changes.

Main Methods:

  • Developed a theoretical framework based on rigorous diffusion treatment.
  • Investigated the conditions for decomposing single-molecule FRET efficiency distributions.
  • Introduced an alternative procedure using photon arrival times for rigorous rate extraction.
  • Applied methods to a two-state system for analytical solutions.

Main Results:

  • Showed that FRET efficiency distributions can be approximated by decomposing them into photon counts and immobilized molecule distributions under specific conditions.
  • Demonstrated that conformational changes during diffusion introduce approximations but allow for simplified analysis.
  • Provided analytical solutions for FRET efficiency distributions in a two-state system.
  • Developed a rigorous method using photon trajectory analysis for extracting conformational change rates.

Conclusions:

  • The proposed methods simplify the analysis of FRET experiments on diffusing molecules.
  • Accurate extraction of conformational dynamics is achievable even with molecular diffusion.
  • The photon trajectory analysis offers a rigorous approach for determining conformational change rates when specific conditions are met.