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Related Experiment Videos

Z-DNA forms without an alternating purine-pyrimidine sequence in solution.

J Feigon, A H Wang, G A van der Marel

    Science (New York, N.Y.)
    |October 4, 1985
    PubMed
    Summary

    This study reveals that a specific DNA decamer transitions from B-DNA to Z-DNA under high salt and methanol conditions. This structural change involves guanine and thymine bases adopting a syn conformation, crucial for understanding DNA dynamics.

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    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Structural Biology

    Background:

    • DNA exists in various conformations, including the common right-handed B-DNA and the left-handed Z-DNA.
    • Structural transitions in DNA are influenced by sequence, salt concentration, and solvent conditions.
    • Understanding these transitions is vital for comprehending DNA function and regulation.

    Purpose of the Study:

    • To investigate the structural behavior of the DNA decamer d(br5CGbr5CGATbr5CGbr5CG) under varying solvent conditions.
    • To determine if this specific DNA sequence undergoes a conformational transition.
    • To elucidate the base conformations adopted during any observed structural changes.

    Main Methods:

    • Nuclear magnetic resonance (NMR) spectroscopy, including proton and phosphorus-31 NMR.

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  • Ultraviolet (UV) absorption spectroscopy.
  • Two-dimensional nuclear Overhauser effect (2D NOE) measurements.

    • Main Results:

    • The DNA decamer d(br5CGbr5CGATbr5CGbr5CG) exhibited a structural transition from B-DNA to Z-DNA under high salt and methanol conditions.
    • Spectroscopic data indicated a change in DNA conformation.
    • 2D NOE measurements revealed that all guanine bases and the two equivalent thymine bases adopted the syn conformation.

    Conclusions:

    • The DNA decamer d(br5CGbr5CGATbr5CGbr5CG) is capable of transitioning to the Z-DNA form.
    • The syn conformation of guanine and thymine is a key feature of the observed Z-DNA structure.
    • Solvent conditions play a critical role in inducing DNA structural transitions, impacting DNA's functional states.