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Related Experiment Videos

Transitions between B-DNA and Z-DNA: a dilemma.

R C Hopkins

    Journal of Theoretical Biology
    |April 7, 1983
    PubMed
    Summary
    This summary is machine-generated.

    The transition between B-DNA and Z-DNA forms in (dG-dC) sequences may not involve distinct structural families. This challenges current models of DNA conformational change under high salt conditions.

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    Area of Science:

    • Molecular Biology
    • Biophysics
    • Structural Biology

    Background:

    • Double-stranded DNA (dG-dC) sequences undergo conformational changes in high salt solutions.
    • These changes are typically modeled as a transition between the B-DNA and Z-DNA forms.

    Purpose of the Study:

    • To address the physical-chemical improbability of interconversion between topologically different B-DNA and Z-DNA structures.
    • To explore alternative explanations for observed DNA conformational changes.

    Main Methods:

    • Theoretical analysis of DNA structural transitions.
    • Discussion of physical-chemical constraints on molecular interconversions.

    Main Results:

    • The assumed transition between B-DNA and Z-DNA structures presents a topological dilemma.

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  • Interconversion mechanisms between these distinct helical families are physically improbable under experimental conditions.

    • Conclusions:

    • The current model of B-DNA to Z-DNA transition may be flawed.
    • Alternative relationships between right-handed (B-DNA) and left-handed (Z-DNA) DNA forms require consideration.