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Probing single-stranded DNA conformational flexibility using fluorescence spectroscopy.

M C Murphy1, Ivan Rasnik, Wei Cheng

  • 1Physics Department, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Biophysical Journal
|March 26, 2004
PubMed
Summary
This summary is machine-generated.

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This study quantifies single-stranded DNA (ssDNA) flexibility using FRET, providing crucial data for statistical models. Findings reveal ssDNA persistence length varies with salt concentration, impacting its conformational dynamics.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • Single-stranded DNA (ssDNA) is vital for DNA metabolism and protein interactions.
  • Describing ssDNA flexibility in solution relies on statistical models, but quantitative data is scarce, especially for short nucleic acid chains.
  • Existing mechanical studies average out ssDNA conformations, limiting detailed analysis.

Purpose of the Study:

  • To quantitatively assess theoretical models of ssDNA flexibility.
  • To provide systematic experimental constraints for validating statistical models of ssDNA conformation.
  • To investigate the influence of salt concentration and chain length on ssDNA flexibility.

Main Methods:

  • Utilized Förster Resonance Energy Transfer (FRET) studies on oligodeoxythymidylates ((dT)N) with varying chain lengths (10-70 nucleotides).

Related Experiment Videos

  • Performed experiments across a broad range of salt concentrations (25 mM to 2 M NaCl).
  • Analyzed fluorescence lifetimes as an internal clock to capture ssDNA conformational dynamics.

    • Main Results:

    • Experimental data showed good agreement with the worm-like chain model under specific conditions.
    • The model's validity depended on limited ssDNA conformational relaxation within the donor's fluorescence lifetime.
    • Estimated persistence length of ssDNA ranged from 1.5 nm (2 M NaCl) to 3 nm (25 mM NaCl).

    Conclusions:

    • The study provides quantitative data for ssDNA flexibility, crucial for refining statistical models.
    • Fluorescence lifetime measurements offer insights into ssDNA dynamics not captured by mechanical methods.
    • Salt concentration significantly influences ssDNA persistence length and conformational behavior.