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Cross-reactive and type-specific complement-fixing structures of Oriboca virions

N Karabatsos, R E Shope

    Journal of Medical Virology
    |January 1, 1979
    PubMed
    Summary

    Researchers characterized Oriboca virus components, identifying distinct structures. A low-infectivity, cross-reactive component and infectious virions were separated, revealing insights into viral envelope antigens and their roles in immune responses.

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    The Journal of experimental medicine·2009

    Area of Science:

    • Virology
    • Immunology
    • Molecular Biology

    Background:

    • Oriboca virus is an arbovirus with complex antigenic properties.
    • Understanding viral component characteristics is crucial for serological assays and vaccine development.

    Purpose of the Study:

    • To characterize the distinct components of Oriboca virus.
    • To elucidate the nature of complement-fixing (CF) antigens and their relationship to viral infectivity and hemagglutination.

    Main Methods:

    • Separation of Oriboca virus components using velocity centrifugation.
    • Disruption of virions with Nonidet P-40 to release antigens.
    • Characterization of separated components via sedimentation coefficients, density gradient centrifugation, and functional assays (complement fixation, hemagglutination inhibition).

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    Main Results:

    • Two main components were identified: a low-infectivity, broadly cross-reactive 6-7S component and infectious 457S virions with hemagglutinating (HA) activity.
    • Disruption released a cross-reactive, virion-associated component and a type-specific CF fragment, both identified as envelope structures with distinct densities (1.245 gm/ml and 1.181 gm/ml, respectively).
    • The type-specific CF antigen blocked hemagglutination-inhibiting (HI) antibody, suggesting a link to viral hemagglutinin, while the cross-reactive fragment did not.

    Conclusions:

    • Oriboca virus possesses distinct envelope structures responsible for type-specific and cross-reactive antigenic properties.
    • The type-specific antigen is likely associated with the viral hemagglutinin, playing a role in host immune recognition.
    • These findings contribute to understanding Oriboca virus antigenicity and have implications for serodiagnosis and arbovirus research.