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DNA-RNA hybrid secondary structures.

S Arnott, R Chandrasekaran, R P Millane

    Journal of Molecular Biology
    |April 20, 1986
    PubMed
    Summary
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    Synthetic DNA-RNA hybrids exhibit unique double-helical structures with distinct chain conformations. X-ray diffraction reveals differing sugar pucker states, suggesting novel biological information transfer mechanisms.

    Area of Science:

    • Molecular Biology
    • Biophysics
    • Structural Biology

    Background:

    • DNA-RNA and DNA-DNA duplexes display significant structural polymorphism.
    • DNA-RNA hybrids can adopt secondary structures similar to A-DNA or A-RNA.

    Purpose of the Study:

    • To investigate the double-helical structures of synthetic DNA-RNA hybrids.
    • To elucidate the conformational differences between DNA and RNA chains within these hybrids.

    Main Methods:

    • Extensive X-ray fiber diffraction analyses were performed.
    • The study focused on synthetic DNA-RNA hybrids poly(dA) X poly(rU) and poly(dI) X poly(rC).

    Main Results:

    • Poly(dA) X poly(rU) formed an 11-fold double helix, while poly(dI) X poly(rC) formed a 10-fold double helix.

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  • DNA chains exhibited C-2'-endo-puckered furanose rings.
  • Antiparallel RNA chains displayed C-3'-endo-puckered rings.

    • Conclusions:

    • DNA-RNA hybrids possess distinct and complex double-helical structures.
    • The observed conformational differences in sugar pucker are significant.
    • These bidirectional properties may play a crucial role in biological information transfer.