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Theoretical studies of d(A:T)-based parallel-stranded DNA duplexes.

E Cubero1, F J Luque, M Orozco

  • 1Departament de Bioquímica i Biologia Molecular, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1, Barcelona 08028, Spain.

Journal of the American Chemical Society
|November 29, 2001
PubMed
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Parallel DNA duplexes using Hoogsteen or reverse Watson-Crick pairing are less stable than antiparallel DNA. Stability differences increase with duplex length, with reverse Watson-Crick being slightly more stable.

Area of Science:

  • * Molecular biology
  • * Biophysics
  • * Computational chemistry

Background:

  • * DNA typically exists as an antiparallel double helix stabilized by Watson-Crick base pairing.
  • * Alternative DNA structures, including parallel duplexes with non-canonical base pairing, are of interest for understanding DNA structure and function.
  • * Hoogsteen and reverse Watson-Crick pairings offer different hydrogen bonding arrangements compared to standard Watson-Crick pairing.

Purpose of the Study:

  • * To investigate the structural, flexibility, and reactivity of poly d(A:T) parallel-stranded DNA duplexes.
  • * To compare the stability of parallel duplexes (Hoogsteen and reverse Watson-Crick) with the canonical antiparallel Watson-Crick duplex.
  • * To elucidate the energetic contributions governing the stability of these different DNA helical structures.

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Main Methods:

  • * Extensive molecular dynamics (MD) simulations were employed to analyze DNA duplex behavior.
  • * Molecular mechanics coupled with Poisson-Boltzmann (MM-PB/SA) calculations were used for energetic assessments.
  • * Trajectory analysis provided insights into structural and flexibility characteristics.

Main Results:

  • * Both Hoogsteen and reverse Watson-Crick parallel DNA duplexes were found to be less stable than antiparallel Watson-Crick duplexes.
  • * The stability difference between parallel and antiparallel duplexes increased linearly with increasing duplex length.
  • * The reverse Watson-Crick parallel duplex exhibited slightly greater stability than the Hoogsteen parallel duplex, with this difference also increasing with length.

Conclusions:

  • * Parallel DNA duplexes, particularly those formed via Hoogsteen or reverse Watson-Crick pairing, are thermodynamically less favorable than antiparallel structures.
  • * The energetic preference for a specific helical structure is determined by a delicate interplay between intramolecular forces and solvation effects.
  • * Understanding these stability differences is crucial for predicting DNA structural preferences and potential functions in various contexts.