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The role of structural parameters in DNA cyclization.

Ludmil B Alexandrov1,2, Alan R Bishop3, Kim Ø Rasmussen4

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, USA. lba@lanl.gov.

BMC Bioinformatics
|February 6, 2016
PubMed
Summary

DNA flexibility is crucial for cellular functions. This study reveals that while DNA structural parameters accurately predict cyclization rates for longer DNA fragments, they perform poorly for shorter ones, with nucleosome-based parameters showing the best agreement with experimental data.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Computational Biology

Background:

  • DNA bendability is essential for cellular mechanisms.
  • DNA fragment flexibility is quantified by the Jacobson-Stockmayer J factor.
  • Understanding DNA cyclization requires evaluating structural parameters.

Purpose of the Study:

  • To assess the role of various DNA structural parameters in calculating DNA cyclization rates.
  • To compare computational predictions with experimental measurements for DNA cyclization.

Main Methods:

  • Utilized a coarse-grained three-dimensional DNA model.
  • Employed seven distinct sets of DNA conformational parameters.
  • Calculated cyclization rates for 86 measured and 20,000 simulated DNA sequences.

Main Results:

  • All parameter sets accurately predicted cyclization rates for DNA fragments longer than 100 bp.
  • Parameter sets showed significant discrepancies with experimental data for DNA fragments shorter than 100 bp.
  • Conformational parameters derived from nucleosome packaging data yielded results closest to experimental measurements.

Conclusions:

  • Structural parameters are reliable for long DNA fragments but not short ones.
  • Nucleosome-based parameters offer improved accuracy for DNA cyclization rate calculations.
  • This study provides a large-scale evaluation of structural parameters' impact on DNA cyclization.