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Related Experiment Videos

Ion-induced DNA structure change in nucleosomes.

M E Hogan, B Hayes, N C Wang

    Biochemistry
    |September 9, 1986
    PubMed
    Summary

    Calcium ions bind tightly to nucleosome core particles, altering DNA structure and methylene blue binding. This suggests DNA may fold into kinks, influencing gene accessibility.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Nucleosome core particles are fundamental units of DNA packaging in eukaryotes.
    • Understanding how ions like calcium (Ca2+) interact with nucleosomes is crucial for comprehending DNA structure and function.
    • Previous studies have indicated potential roles for divalent cations in modulating chromatin structure.

    Purpose of the Study:

    • To investigate the physical mechanisms of calcium ion binding to the nucleosome core particle.
    • To elucidate the structural consequences of Ca2+ binding on DNA within the nucleosome.
    • To explore the implications of Ca2+ -induced structural changes for DNA-protein interactions and gene regulation.

    Main Methods:

    • Equilibrium dialysis to assess Ca2+ binding affinity.
    • Spectroscopic analysis (circular dichroism, absorbance, fluorescence) to monitor structural changes.
    • Methylene blue (MB) intercalation as a probe for DNA binding site alterations.
    • Triplet state anisotropy decay and lifetime quenching to characterize MB dynamics.

    Main Results:

    • Ca2+ binds tightly to nucleosome core particles, causing significant changes in DNA circular dichroism.
    • Methylene blue binding to nucleosomes is confirmed, but its site is altered by Ca2+ presence.
    • MB exhibits increased wobbling at its binding site in the Ca2+-nucleosome complex, indicative of DNA conformational flexibility.
    • Data support a model where Ca2+ binding induces sharp bends (kinks) in the nucleosomal DNA.

    Conclusions:

    • Ca2+ binding induces DNA kinking within nucleosomes, altering the DNA's structural and binding properties.
    • The proposed DNA kinking model explains the observed behavior of intercalating dyes like MB.
    • Nucleosomal DNA structure may exist near a smooth-to-kinked helix equilibrium, making it sensitive to ion concentration and sequence-specific factors.
    • This sensitivity could play a role in regulating gene expression by modulating DNA accessibility within chromatin.

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