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Related Experiment Videos

Poly(ADP-ribose) effectively competes with DNA for histone H4 binding.

G Sauermann, J Wesierska-Gadek

    Biochemical and Biophysical Research Communications
    |September 14, 1986
    PubMed
    Summary

    Poly(ADP-ribose) binds to histone H4, competing with DNA. This interaction may cause DNA to detach from nucleosomes during DNA repair, aiding in DNA damage response.

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    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Epigenetics

    Background:

    • Histones are crucial for DNA packaging into nucleosomes.
    • Poly(ADP-ribose) (PAR) is involved in DNA repair pathways.
    • The interaction between PAR and histones is not fully understood.

    Purpose of the Study:

    • To investigate the effect of poly(ADP-ribose) on DNA-histone H4 interactions.
    • To determine if PAR can disrupt DNA-nucleosome binding.

    Main Methods:

    • Nitrocellulose filter binding assay.
    • Studied binding affinities under physiological salt conditions.

    Main Results:

    • Poly(ADP-ribose) forms complexes with histone H4.
    • PAR effectively competes with DNA for histone H4 binding.
    • PAR displaces DNA from pre-formed DNA-histone H4 complexes.

    Conclusions:

    • Poly(ADP-ribose) can dissociate DNA from histone H4.
    • This dissociation may occur at DNA damage sites, facilitating nucleosome remodeling.
    • PAR's role in DNA repair may involve modulating chromatin structure.

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