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Related Experiment Videos

Virus-coded DNA endonuclease from avian retrovirus.

M Golomb, D P Grandgenett, W Mason

    Journal of Virology
    |May 1, 1981
    PubMed
    Summary

    Avian retrovirus reverse transcriptase contains a DNA endonuclease. This enzyme is encoded by the pol gene and is integral to reverse transcriptase function, though some mutants show independent thermal stability.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Enzymology

    Background:

    • Avian retroviruses possess a reverse transcriptase enzyme crucial for viral replication.
    • This enzyme is known to have associated DNA endonuclease activity with unique requirements.
    • The pp32 protein, found in viral cores, has been linked to the reverse transcriptase beta subunit.

    Purpose of the Study:

    • To investigate the genetic basis and functional integration of the DNA endonuclease activity associated with avian retrovirus reverse transcriptase.
    • To determine if the DNA endonuclease is a product of the pol gene and an integral component of the reverse transcriptase complex.

    Main Methods:

    • Analysis of temperature-sensitive avian retrovirus mutants with thermolabile DNA polymerase.
    • Testing the thermal sensitivity of the associated DNA endonuclease activity in these mutants.
    • Characterization of a temperature-resistant revertant to assess heat stability.

    Main Results:

    • Two Rous sarcoma virus pol mutants (ts335, ts337) exhibited thermolabile DNA endonuclease activity.
    • A temperature-resistant revertant of ts335 displayed heat-stable DNA endonuclease.
    • A distinct class of pol mutants (ts568, ts553) showed thermolabile DNA polymerase but heat-stable DNA endonuclease.

    Conclusions:

    • The DNA endonuclease activity is encoded by the pol gene and is an integral part of the avian retrovirus reverse transcriptase.
    • The findings suggest distinct functional domains within the pol gene, with polymerase and endonuclease activities potentially exhibiting differential thermal sensitivity in certain mutants.

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