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Structural polymorphism in d(T)12.d(A)12*d(T)12 triple helices

M R Kiran1, M Bansal

  • 1Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India.

Journal of Biomolecular Structure & Dynamics
|December 1, 1995
PubMed
Summary

DNA triple helices with parallel third strands are energetically favored, though antiparallel orientations are comparable. Molecular dynamics reveal structural heterogeneity in parallel triplexes at 300K.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Chemistry

Background:

  • DNA triple helices are nucleic acid structures with potential applications in medicine and biotechnology.
  • Understanding the stability and structural dynamics of these triplexes is crucial for their effective utilization.

Purpose of the Study:

  • To investigate the energetic favorability of different DNA triple helix orientations.
  • To analyze the structural heterogeneity of parallel DNA triple helices using molecular dynamics simulations.

Main Methods:

  • Computational modeling including energy minimization.
  • Molecular dynamics simulations (200ps at 300K).
  • Comparison with existing theoretical and NMR structural data.

Main Results:

  • The parallel orientation of the third thymine strand, forming Hoogsteen hydrogen bonds with the adenine base of the Watson-Crick duplex, is energetically most favorable.
  • An antiparallel orientation, where the third strand base hydrogen bonds to both bases in the duplex, is energetically comparable.
  • Molecular dynamics simulations indicate significant structural heterogeneity in the parallel triplex at 300K.

Conclusions:

  • The parallel orientation of DNA triple helices is generally preferred due to energetic stability.
  • Structural heterogeneity exists within parallel triplexes, suggesting dynamic conformational flexibility.
  • These findings contribute to a deeper understanding of DNA triple helix structures and their potential applications.

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