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Flexibility of DNA.

P J Hagerman1

  • 1Department of Biochemistry, Biophysics, and Genetics, University of Colorado Health Sciences Center, Denver 80262.

Annual Review of Biophysics and Biophysical Chemistry
|January 1, 1988
PubMed
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Microscopic and macroscopic DNA flexibility models must agree. Studies using precisely defined DNA fragments confirm DNA

Area of Science:

  • Molecular Biology
  • Biophysics
  • Biochemistry

Background:

  • Macroscopic elastic models of DNA flexibility are well-supported by experimental data.
  • Microscopic models require validation against established macroscopic properties.
  • Understanding DNA flexibility is crucial for studying sequence, damage, and interactions.

Purpose of the Study:

  • To evaluate microscopic DNA flexibility models against macroscopic quantities.
  • To identify sensitive methods for analyzing short DNA fragments (<500-1000 bp).
  • To assess the impact of DNA sequence, damage, and interactions on flexibility.

Main Methods:

  • Utilizing three sensitive methods for short DNA molecules to maximize signal and control sequence.
  • Concurrent application of methods for cross-validation of DNA flexibility measurements.

Related Experiment Videos

  • Analysis of topoisomer distributions in circular DNA for torsional elastic constant determination.

    • Main Results:

    • The persistence length of DNA in moderate salt buffers is determined to be 450-500 Å.
    • The torsional elastic constant of DNA is established at approximately 3.0 x 10⁻¹⁹ erg-cm.
    • Synthetic DNA and restriction fragments eliminate length polydispersity issues in physical studies.

    Conclusions:

    • Precisely defined DNA molecules are essential for accurate physical property studies.
    • Microscopic models must accurately predict macroscopic DNA elastic properties.
    • Established DNA flexibility parameters provide a benchmark for future research.