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Comparative studies on parallel and antiparallel duplex and triplex DNA

C Q Liu1, X F Shi, C L Bai

  • 1Laboratory of Cellular and Molecular Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, People's Republic of China.

Journal of Theoretical Biology
|February 7, 1997
PubMed
Summary
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Parallel DNA structures exhibit distinct conformational energies compared to standard B-DNA, influenced by base stacking and hydrogen bonding in both duplexes and triple helices.

Area of Science:

  • Molecular Biology
  • Biophysics
  • Computational Chemistry

Background:

  • DNA exists in various structural forms beyond the canonical B-DNA.
  • Understanding alternative DNA conformations like parallel duplexes and triple helices is crucial for molecular biology.
  • The stability and energy profiles of these structures are influenced by base pairing and stacking.

Purpose of the Study:

  • To build and analyze parallel DNA duplex and triple helix models.
  • To compare the conformational energies of parallel DNA structures with their B-DNA counterparts.
  • To investigate the impact of base stacking and hydrogen bonding on DNA stability.

Main Methods:

  • Molecular architecture and energy minimization techniques were employed.
  • Parallel strand DNA models for duplexes (e.g., d(A)10.d(T)10) and triple helices (e.g., d(T)14.d(A)14.d(T)14) were constructed.

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  • Conformational energies were calculated and compared.

    • Main Results:

    • Parallel AT duplex models showed slightly lower conformational energies than B-DNA.
    • Parallel GC duplex models exhibited approximately 8% higher conformational energies than B-DNA.
    • Energy differences were primarily attributed to base stacking interactions, particularly for GC pairs.
    • Parallel duplexes with single hydrogen-bonded G-C pairs were less stable than those with double hydrogen-bonded G-C pairs.

    Conclusions:

    • Base stacking and sequence significantly affect DNA conformations.
    • Parallel DNA structures have distinct energetic properties compared to B-DNA.
    • The number of hydrogen bonds in G-C pairs influences the stability of parallel duplexes.