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Related Experiment Videos

Radioimmunoassay for mammalian type C viral reverse transcriptase.

J M Krakower, M Barbacid, S A Aaronson

    Journal of Virology
    |May 1, 1977
    PubMed
    Summary

    Radioimmunoassays can detect small amounts of reverse transcriptase, a key enzyme in mammalian type C RNA viruses. This method identifies type-specific and shared viral enzyme characteristics, aiding in subviral expression detection.

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    Area of Science:

    • Virology
    • Molecular Biology
    • Immunology

    Background:

    • Mammalian type C RNA viruses are associated with various diseases.
    • Reverse transcriptase is a crucial enzyme in the replication cycle of these viruses.
    • Sensitive detection methods are needed to study viral expression.

    Purpose of the Study:

    • To develop and apply radioimmunoassays for the detection and characterization of mammalian type C viral reverse transcriptase.
    • To quantify reverse transcriptase in Rauscher mouse leukemia virus.
    • To investigate the antigenic properties and cross-reactivity of viral reverse transcriptases.

    Main Methods:

    • Purification of Rauscher mouse leukemia virus reverse transcriptase using ion exchange and affinity chromatography.
    • Development of radioimmunoassays (RIAs) for enzyme detection.
    • Homologous competition and interspecies immunoassays to analyze antigenic determinants.

    Main Results:

    • RIAs detected as little as 1 ng of purified reverse transcriptase.
    • Rauscher mouse leukemia virus contains approximately 40 molecules of reverse transcriptase per virion.
    • Type-specific antigenic determinants distinguished Rauscher viral enzyme from other mouse type C viral polymerases.
    • Reverse transcriptases from various mammalian type C viruses showed cross-reactivity, indicating shared antigenic determinants.
    • Enzyme inactivation treatments did not affect immunological properties.

    Conclusions:

    • Radioimmunoassays are sensitive tools for detecting and characterizing viral reverse transcriptase.
    • The findings highlight conserved and specific antigenic features of mammalian type C viral reverse transcriptases.
    • This technique can serve as a valuable marker for detecting subviral expression of type C viruses.

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