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Base-Pairing and Base-Stacking Contributions to Double-Stranded DNA Formation.

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  • 1Physics Department T38, Technical University of Munich, 85748 Garching, Germany.

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Base stacking contributes to DNA stability in single strands, while base pairing drives double-stranded DNA formation. This new model quantifies hydrogen bond contributions to DNA stability.

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Area of Science:

  • Molecular Biology
  • Biophysics

Background:

  • Double-stranded DNA (dsDNA) stability is crucial for biological processes.
  • Existing models suggest base stacking dominates dsDNA stability, with base pairing contributing minimally.

Purpose of the Study:

  • To re-evaluate the contributions of base pairing and stacking to dsDNA stability using a novel theoretical model.
  • To differentiate the roles of base stacking and base pairing in dsDNA formation.

Main Methods:

  • Development and application of a new theoretical model for dsDNA formation.
  • Reanalysis of existing experimental data on dsDNA stability.
  • Comparison with established nearest-neighbor models and stacking data.

Main Results:

  • Base stacking contributes to the stability of single-stranded DNA (ssDNA) prior to helix formation.
  • Base pairing is identified as the primary driver of dsDNA formation.
  • A quantitative prediction of stability contributions for GC, mixed, and AT base-pair steps (6:5:4 ratio) was made.
  • An effective free energy contribution per hydrogen bond was determined to be -0.72 kcal·mol⁻¹.

Conclusions:

  • The new model reconciles existing data and provides a refined understanding of dsDNA stability.
  • Base pairing plays a more significant role in dsDNA formation than previously suggested by some models.
  • The findings offer a precise energetic contribution of hydrogen bonds to DNA stability.