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Parallel and antiparallel triple helices with G, A-containing third strands.

H Porumb1, H Gousset, E Taillandier

  • 1Laboratoire de Spectroscopie Biomoléculaire, UPRESA CNRS 7031, Université Paris-Nord, Bobigny, France. porumb@infobiogen.fr

Electrophoresis
|April 27, 1999
PubMed
Summary

This study demonstrates a stable parallel triple helix formed by a specific oligonucleotide. This parallel structure exhibits a significantly lower dissociation constant than its antiparallel counterpart, indicating enhanced stability.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Triple helix formation is crucial for DNA recognition and regulation.
  • Polypurine tracts in viral genomes, like Friend leukemia virus, are targets for structural studies.
  • Understanding DNA triplex stability is key to developing novel therapeutic strategies.

Purpose of the Study:

  • To investigate the formation and stability of a parallel triple helix structure.
  • To compare the binding affinity of parallel versus antiparallel triplexes.
  • To explore temperature-dependent structural transitions in DNA triplexes.

Main Methods:

  • Electrophoretic titration was used to determine the dissociation constant.
  • Synthesis of a 13-nucleotide (nt) all-purine oligonucleotide with a six-guanine tract.

Related Experiment Videos

  • Studies were conducted in 0.1 M LiCl at varying temperatures (4°C and 25°C).

    • Main Results:

    • A stable parallel triple helix was formed by the all-purine oligonucleotide and a homopurine target strand.
    • The parallel triplex exhibited a dissociation constant of approximately 50 nM at 25°C, significantly lower than the antiparallel triplex.
    • At 4°C, a mixed parallel/antiparallel triplex formed, indicating temperature-dependent structural preferences.

    Conclusions:

    • Parallel triple helix formation is thermodynamically favored under specific conditions.
    • The parallel triplex demonstrates superior stability compared to the antiparallel conformation.
    • Temperature plays a critical role in dictating the orientation and stability of DNA triplexes.