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Related Experiment Videos

Sequence-dependent anisotropic flexibility of B-DNA. A conformational study.

N B Ulyanov1, V B Zhurkin

  • 1Institute of Molecular Biology, Academy of Science of the USSR, Moscow.

Journal of Biomolecular Structure & Dynamics
|October 1, 1984
PubMed
Summary

DNA bending flexibility is sequence-dependent, with specific dinucleotides preferring major or minor groove bending. This anisotropy influences DNA structure in solution and nucleosome wrapping.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Molecular Biology

Background:

  • The bending flexibility of DNA is crucial for its biological functions, including packaging within nucleosomes and higher-order structures.
  • Understanding DNA's mechanical properties, such as stiffness and anisotropy, is essential for deciphering its role in cellular processes.

Purpose of the Study:

  • To investigate the bending flexibility and sequence-dependent anisotropy of six tetrameric DNA duplexes.
  • To determine how base stacking interactions and sugar-phosphate backbone structure influence DNA bending into major and minor grooves.
  • To correlate calculated DNA bending parameters with experimental data and existing models of DNA structure.

Main Methods:

  • Computational analysis of DNA bending flexibility for various tetrameric duplexes (e.g., d(AAAA):d(TTTT), d(AATT)2, d(GGCC)2).

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  • Extension of tetramers with regular double helices to simulate longer DNA segments.
  • Calculation of DNA stiffness, anisotropy, and bending fluctuations along the dyad axis.

    • Main Results:

    • The B-DNA double helix exhibits significant bending anisotropy, being less stiff when bent into the grooves compared to the perpendicular direction.
    • Sequence-dependent anisotropy was observed, with purine-pyrimidine (RY) dimers favoring minor groove bending and YR dinucleotides preferring major groove bending (6-12 degrees).
    • Calculated bending fluctuations (5-7 degrees) align with experimental DNA persistence length values, and DNA remains in the B-family form even at significant bends.

    Conclusions:

    • DNA bending anisotropy is primarily a property of the sugar-phosphate backbone, modulated by base stacking interactions.
    • The sequence-dependent bending preferences, particularly the YR dinucleotide-induced bends, likely dictate the three-dimensional structure of DNA in solution.
    • These findings support models of DNA wrapping in nucleosomes involving 'mini-kinks' and highlight the importance of sequence in DNA structural organization.