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An endonuclease from mouse cells specific for single-stranded DNA.

B Otto, R Knippers

    European Journal of Biochemistry
    |December 11, 1976
    PubMed
    Summary
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    A novel endonuclease enzyme was purified from mouse cells. This enzyme specifically degrades single-stranded DNA into small fragments, impacting DNA structure.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Endonucleases play crucial roles in DNA metabolism and repair.
    • Characterization of novel enzymes is essential for understanding cellular processes.

    Purpose of the Study:

    • To extensively purify and characterize a novel endonuclease from mouse ascites cells.
    • To investigate the substrate specificity and enzymatic properties of the purified endonuclease.

    Main Methods:

    • Extensive purification of endonuclease from mouse ascites cells.
    • Assays to determine substrate specificity (single-stranded DNA, circular DNA).
    • Analysis of degradation products (oligonucleotides).
    • Investigation of enzyme sensitivity to salt concentration and buffer dielectric constant.

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    Main Results:

    • An endonuclease with a molecular weight of approximately 70,000 (5-6S) was purified.
    • The enzyme specifically degrades single-stranded DNA into oligonucleotides (5-10 residues).
    • Supercoiled circular DNA is converted to a linear relaxed form.
    • Enzyme activity is salt-sensitive and stimulated by reagents like DMSO and glycerol.

    Conclusions:

    • A novel endonuclease with specific single-stranded DNA degrading activity has been identified and purified.
    • The enzyme's properties suggest a role in DNA processing or repair pathways.
    • Further studies are warranted to elucidate the enzyme's precise biological function.