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Updated: Feb 7, 2026

An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics
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Testing Kinetic Identities Involving Transition-Path Properties Using Single-Molecule Folding Trajectories.

Krishna Neupane1, Noel Q Hoffer1, Michael T Woodside1

  • 1Department of Physics , University of Alberta , Edmonton , AB T6G 2E1 , Canada.

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|July 14, 2018
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Summary

Researchers directly observed DNA hairpin folding using single-molecule assays. Folding and unfolding rates correlate with transition path times, validating theoretical kinetic models for molecular dynamics.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Molecular Biology

Background:

  • Single-molecule assays enable direct observation of molecular folding pathways.
  • Understanding the kinetics of molecular folding is crucial for various biological processes.

Purpose of the Study:

  • To test theoretical relationships between transition path properties and folding kinetics.
  • To validate kinetic identities using experimental data from DNA hairpins.

Main Methods:

  • Utilized high-resolution optical tweezers to measure transition paths of DNA hairpins with varying sequences.
  • Analyzed folding and unfolding rates, transition-path times, and transition-path occupancies.
  • Calculated average velocity profiles along transition paths.

Main Results:

  • Observed a direct correlation between folding/unfolding rates and average transition-path times for all studied hairpins.
  • Found agreement between transition-path occupancy distributions and average velocity profiles.
  • Demonstrated that committor probabilities derived from velocity profiles match empirical measurements.

Conclusions:

  • The study experimentally validates theoretical kinetic identities governing molecular folding.
  • Direct observation of transition paths provides a powerful method for understanding molecular kinetics.
  • Results confirm the predictive power of theoretical models for molecular dynamics.