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Related Experiment Videos

Superhelical DNA-dependent ATPase from calf thymus.

P Zahradka, K Ebisuzaki

    Biochemical and Biophysical Research Communications
    |August 30, 1985
    PubMed
    Summary

    Researchers isolated two distinct DNA-dependent ATPases from calf thymus poly(ADP-ribose) polymerase. These enzymes showed high stimulation by supercoiled DNA, suggesting a specific role in DNA processes.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Poly(ADP-ribose) polymerase (PARP) is involved in DNA repair and other cellular processes.
    • DNA-dependent ATPases play crucial roles in various DNA metabolic pathways.

    Purpose of the Study:

    • To isolate and characterize DNA-dependent ATPases associated with calf thymus poly(ADP-ribose) polymerase.
    • To investigate the substrate specificity and activation properties of these isolated ATPases.

    Main Methods:

    • Purification of poly(ADP-ribose) polymerase from calf thymus.
    • Enzymatic assays to detect and characterize ATPase activity.
    • Testing stimulation by various nucleic acid substrates, including supercoiled DNA.

    Main Results:

    • Two physically and catalytically distinct DNA-dependent ATPases were successfully isolated.
    • Both isolated ATPases exhibited significant stimulation by supercoiled DNA.
    • Differential stimulation by other nucleic acids and polynucleotides was observed for the two enzymes.

    Conclusions:

    • Calf thymus poly(ADP-ribose) polymerase preparation contains distinct DNA-dependent ATPases.
    • Supercoiled DNA is a potent activator for these identified ATPases.
    • These ATPases may possess specific functions related to supercoiled DNA metabolism.

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