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Related Experiment Videos

Why do A.T base pairs inhibit Z-DNA formation?

L X Dang1, D A Pearlman, P A Kollman

  • 1Department of Pharmaceutical Chemistry, University of California, San Francisco 94143.

Proceedings of the National Academy of Sciences of the United States of America
|June 1, 1990
PubMed
Summary

DNA's Z-form is less stable for A.T sequences than G.C sequences. Free energy calculations reveal that both internal DNA interactions and solvation effects contribute to this "Z-phobicity," impacting DNA structure.

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Area of Science:

  • Computational chemistry
  • Molecular biophysics
  • Genomics and bioinformatics

Background:

  • DNA exists in various structural forms, including A, B, and Z-DNA.
  • The stability and conformational preferences of DNA are influenced by base sequence and environmental factors.
  • Understanding the energetic basis of DNA structural transitions is crucial for comprehending its biological functions.

Purpose of the Study:

  • To investigate the free energy changes associated with base pair mutations (G.C to A.T) in different DNA structural forms (A, B, Z).
  • To assess the contributions of intranucleotide interactions and solvation effects to DNA structural preferences, particularly Z-phobicity.
  • To compare computational findings with experimental data on DNA sequence-dependent structural propensities.

Main Methods:

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  • Free energy perturbation calculations were performed on DNA hexanucleotides.
  • Simulations were conducted in vacuo and in explicit aqueous solution.
  • Energy component analyses and model calculations with reduced electrostatic charges were utilized.

Main Results:

  • The free energy cost of mutating a G.C to an A.T base pair is significantly higher in the Z-DNA conformation compared to A and B-DNA forms, both in vacuo and in solution.
  • In solution, the Z-form is approximately 3 kcal/mol less stable for A.T sequences than for G.C sequences.
  • Calculations indicate that both intramolecular interactions and solvation play a role in the observed 'Z-phobicity' of A.T-rich sequences.

Conclusions:

  • A.T sequences exhibit a higher energetic penalty in the Z-DNA conformation, consistent with experimental observations of 'Z-phobicity'.
  • Both base stacking/hydrogen bonding within the DNA and interactions with surrounding water molecules contribute to sequence-dependent DNA structural preferences.
  • These findings provide a molecular-level understanding of the forces governing DNA structural polymorphism and sequence recognition.