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Related Experiment Videos

Zinc Z-DNA.

G V Fazakerley

    Nucleic Acids Research
    |April 25, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Zinc complexes induce a left-handed helix in poly(dG-dC) DNA. The efficiency of this B-DNA to Z-DNA transition depends on the zinc complex's ligand structure, with a tetradentate amine being most effective.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Poly(dG-dC) is a DNA sequence known to adopt different helical structures.
    • The transition between B-DNA and Z-DNA is a significant conformational change in DNA structure.
    • Metal ions, including zinc complexes, are known to influence DNA conformation.

    Purpose of the Study:

    • To investigate the effect of zinc complexes on the conformation of poly(dG-dC) DNA.
    • To determine the role of zinc complex ligands in mediating the B-DNA to Z-DNA transition.
    • To characterize the structural changes using spectroscopic methods.

    Main Methods:

    • Circular dichroism (CD) spectroscopy to detect helical structure changes.
    • Analysis of CD spectral inversion indicative of left-handed helix formation.

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  • 31P Nuclear Magnetic Resonance (NMR) spectroscopy to confirm DNA structure.
  • Varying zinc complexes with different ligands to study transition efficiency.

    • Main Results:

    • Circular dichroism spectra showed characteristic inversion, confirming left-handed helix formation in poly(dG-dC) with zinc complexes.
    • The B-DNA to Z-DNA transition was observed to be cooperative and slow.
    • The midpoint concentration for this transition was highly dependent on the ligand bound to zinc.
    • A zinc complex with a tetradentate amine ligand was most efficient, with a midpoint at a zinc:nucleotide ratio of 1:24.
    • 31P NMR spectra corroborated the formation of a left-handed helix.

    Conclusions:

    • Zinc complexes can induce the formation of a left-handed helical structure (Z-DNA) in poly(dG-dC).
    • The ligand environment of the zinc ion critically influences its efficacy in promoting the B-DNA to Z-DNA transition.
    • Specific zinc complexes, particularly those with tetradentate amine ligands, are potent inducers of Z-DNA formation.