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Related Experiment Videos

Sequence-dependent B<-->A transition in DNA evaluated with dimeric and trimeric scales.

M Y Tolstorukov1, V I Ivanov, G G Malenkov

  • 1Laboratory of Computational and Experimental Biology, National Cancer Institute, NIH, Bethesda, Maryland 20892, USA.

Biophysical Journal
|November 27, 2001
PubMed
Summary

New scales reveal DNA

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • DNA exists in different conformations, notably the B and A forms.
  • The transition between these forms is influenced by DNA sequence.
  • Understanding these conformational changes is crucial for DNA-protein interactions.

Purpose of the Study:

  • To develop accurate scales predicting the B-DNA to A-DNA conformational transition.
  • To investigate sequence-dependent propensities for DNA conformations.
  • To identify sequence motifs that favor specific DNA forms.

Main Methods:

  • Experimental characterization of 24 oligo- and polymeric DNA duplexes.
  • Determination of free energy differences between B and A forms in solution.

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  • Development and comparison of dimeric and trimeric sequence scales.

    • Main Results:

    • Developed optimal dimeric and trimeric scales for the DNA B<-->A transition.
    • Trimeric scales provide more accurate predictions of sequence-dependent conformational propensities.
    • Identified specific sequence motifs (e.g., AA:TT dimers, AAN:N'TT trimers) with strong B-form preference due to groove interactions.
    • The trimeric scale correlates with DNA trimer occurrences in A-form within protein-DNA complexes.

    Conclusions:

    • Trimeric scales offer improved prediction of DNA conformational states.
    • Hydration and groove interactions play key roles in sequence-dependent B<-->A transitions.
    • The developed scales can identify A-philic motifs in genomic sequences for protein-DNA recognition studies.