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Coronavirus IBV: further evidence that the surface projections are associated with two glycopolypeptides

D Cavanagh

    The Journal of General Virology
    |August 1, 1983
    PubMed

    Insights

    Researchers isolated avian infectious bronchitis virus (IBV) peplomers, identifying two key glycopolypeptides (S1 and S2) crucial for virus structure. This study clarifies the protein composition of IBV strain M41.

    Area of Science:

    • Virology
    • Molecular Biology
    • Protein Chemistry

    Background:

    • Avian infectious bronchitis virus (IBV) is a significant pathogen in poultry.
    • Understanding the structural proteins of IBV is crucial for developing effective control strategies.
    • The peplomers (surface projections) are key determinants of viral tropism and immunogenicity.

    Purpose of the Study:

    • To isolate and characterize the peplomer proteins of IBV strain M41.
    • To determine the molecular weights and stoichiometry of peplomer subunits.
    • To differentiate viral proteins from host cell contaminants.

    Main Methods:

    • Virus disruption using Nonidet P40 detergent.
    • Separation of viral proteins via sucrose gradient sedimentation.
    • Analysis of protein composition using differential radiolabelling and Coomassie Brilliant Blue staining.

    Main Results:

    • Peplomers were successfully separated from nucleocapsid (N) and matrix (M) proteins.
    • Peplomers consist of two glycopolypeptides, S1 (90K) and S2 (84K), in equimolar amounts.
    • Host cell polypeptides (75K and 110K) were identified and excluded from peplomer preparations.
    • The molar ratio of S1:S2:N:M in IBV-M41 was determined to be approximately 1:1:6:15.

    Conclusions:

    • The S1 and S2 glycopolypeptides are the major components of IBV M41 peplomers.
    • This detailed protein characterization provides a foundation for further studies on IBV structure-function relationships.
    • Accurate identification of viral components aids in distinguishing them from host-derived proteins.

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