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Affinity Purification of Influenza Virus Ribonucleoprotein Complexes from the Chromatin of Infected Cells
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Published on: June 3, 2012

Polypeptides of infectious bronchitis virus. I. Polypeptides of the virion

B Lomniczi, J Morser

    The Journal of General Virology
    |July 1, 1981
    PubMed

    Insights

    This study characterizes the structural proteins of Infectious Bronchitis Virus (IBV) strains, revealing distinct polypeptide patterns between M and C types. These differences are primarily due to variations in the mobility of key glycopeptides, aiding in viral classification.

    Area of Science:

    • Virology
    • Molecular Biology
    • Protein Chemistry

    Background:

    • Infectious Bronchitis Virus (IBV) is a significant avian pathogen.
    • Understanding IBV structural proteins is crucial for viral characterization and control.
    • Previous studies identified distinct polypeptide patterns in different IBV serotypes.

    Purpose of the Study:

    • To identify and characterize the structural proteins of IBV strain Beaudette grown in cell culture and in ovo.
    • To compare the polypeptide profiles of different IBV serotypes.
    • To elucidate the molecular basis for distinct IBV polypeptide patterns.

    Main Methods:

    • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was used to separate viral proteins.
    • [3H]glucosamine labeling was employed to identify glycoproteins.
    • Polypeptides were analyzed based on their molecular weights and phosphorylation status.

    Main Results:

    • Cell-cultured IBV (strain Beaudette) revealed five structural proteins: p170, gp94, pp50, gp30, and p26. Gp94 and gp30 are glycoproteins, and pp50 is phosphorylated.
    • Egg-grown IBV exhibited additional proteins, including p110 and gp75. Actin was also detected in purified virions.
    • Distinct polypeptide patterns, classified as M and C types, were observed in different IBV serotypes. Strain Beaudette showed the M type, while strain Connecticut displayed the C type, with variations in large (gp94/gp98) and small (gp30/gp28) glycopeptide mobility.

    Conclusions:

    • The structural protein composition of IBV varies between strains and growth methods (cell culture vs. in ovo).
    • Distinct polypeptide patterns, particularly concerning glycopeptide mobility, are characteristic of different IBV serotypes (M vs. C types).
    • These findings contribute to the molecular classification and understanding of IBV diversity.

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