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Structural polypeptides of coronavirus IBV.

D Cavanagh

    The Journal of General Virology
    |March 1, 1981
    PubMed
    Summary

    This study identifies five virus-coded polypeptides in avian infectious bronchitis virus (IBV) using radiolabelling and gel electrophoresis. Four of these polypeptides are glycosylated, with two forming the virion spikes.

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    Area of Science:

    • Virology
    • Molecular Biology
    • Biochemistry

    Background:

    • Avian infectious bronchitis virus (IBV) is a significant pathogen affecting poultry worldwide.
    • Understanding the structural components of IBV is crucial for developing effective control strategies.

    Purpose of the Study:

    • To identify and characterize the virus-coded polypeptides of avian infectious bronchitis virus (IBV).
    • To determine which of these polypeptides are glycosylated and their potential roles within the virion.

    Main Methods:

    • Avian infectious bronchitis virus (IBV) was propagated and radiolabeled with 35S-methionine, 3H-leucine, and 3H-glucosamine in de-embryonated chicken eggs.
    • Virus preparations were analyzed using SDS-polyacrylamide gel electrophoresis to detect and characterize viral polypeptides.
    • Chorioallantoic membrane cells were used to differentiate between viral and host cell proteins.

    Main Results:

    • Approximately 12 polypeptides were detected in IBV preparations; most were identified as host components.
    • Five polypeptides were determined to be virus-coded, with molecular weights of 94, 84, 54, 30, and 28 kDa.
    • Four virus-coded polypeptides (p94, p84, p30, p28) were found to be glycosylated.
    • p94 and p84 appeared to constitute the virion spikes, while p30 and p28 were associated with the viral membrane.
    • p54 was identified as the nucleocapsid polypeptide.

    Conclusions:

    • The study successfully delineated the virus-coded protein components of IBV, distinguishing them from host cell proteins.
    • The identification of glycosylated structural proteins, including spike components, provides insights into IBV assembly and infectivity.
    • These findings contribute to a deeper understanding of IBV molecular biology, aiding in future research and vaccine development.

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