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Related Experiment Videos

Surface proteins of Breda virus.

M Koopmans, J Ederveen, G N Woode

    American Journal of Veterinary Research
    |September 1, 1986
    PubMed
    Summary

    Breda virus serotypes 1 and 2 were characterized, revealing distinct properties from Berne virus. Key viral polypeptides were identified, suggesting surface structures crucial for torovirion infectivity and cross-reactivity.

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    Area of Science:

    • Virology
    • Molecular Biology
    • Structural Biology

    Background:

    • Breda virus, a member of the Toroviridae family, exhibits variable physical properties.
    • Understanding the structural components of Breda virus is essential for its classification and characterization.

    Purpose of the Study:

    • To investigate the sedimentation and density properties of Breda virus serotypes 1 and 2.
    • To identify and characterize the structural polypeptides of Breda viruses.
    • To compare Breda viruses with Berne virus, the prototype of Toroviridae.

    Main Methods:

    • Sucrose gradient centrifugation (isokinetic and isopycnic) for purification and property analysis.
    • Radioiodination and radioimmune precipitation to identify viral polypeptides.
    • Hemagglutination inhibition and virus neutralization assays for serological comparison.

    Main Results:

    • Breda-1 virus showed poor preservation, while Breda-2 virus exhibited stable sedimentation (350 S) and density (1.18 g/ml), comparable to Berne virus.
    • A two-step purification method yielded high-purity Breda viruses.
    • Radioiodination identified viral polypeptides at 105,000, 85,000, 37,000, and 20,000 Da, with 105,000 and 85,000 Da likely representing surface proteins.
    • Immune serum against Breda-2 cross-reacted with Breda-1 polypeptides and neutralized Berne virus.

    Conclusions:

    • Breda virus serotypes possess distinct physical and structural characteristics.
    • The 105,000- and 85,000-Da polypeptides are identified as potential peplomeric surface proteins of torovirions.
    • These findings contribute to the understanding of torovirus structure and interrelationships.

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