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Immunologically reactive proteins of Streptococcus equi.

J F Timoney, J Trachman

    Infection and Immunity
    |April 1, 1985
    PubMed
    Summary

    Researchers identified protective Streptococcus equi M protein fragments in both acid extracts and culture supernatants. These fragments, varying in molecular weight, are crucial for immune response and potential vaccine development against S. equi infections.

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    Area of Science:

    • Microbiology
    • Immunology
    • Protein Chemistry

    Background:

    • Streptococcus equi is a significant pathogen causing diseases like strangles in horses.
    • Understanding the immunogenic components of S. equi, particularly M protein, is vital for developing effective vaccines and treatments.
    • Previous studies have indicated the presence of M protein in S. equi, but its exact nature in different preparations requires further elucidation.

    Purpose of the Study:

    • To identify and characterize immunologically reactive proteins in acid extracts and culture supernatants of Streptococcus equi.
    • To determine the molecular weight and potential protective roles of these S. equi protein components.
    • To investigate the relationship between M protein in different S. equi preparations and its immunogenicity.

    Main Methods:

    • Chromatographic and immunologic procedures were employed to isolate and analyze proteins from S. equi acid extracts and culture supernatants.
    • Protective efficacy of protein components was assessed in mouse models.
    • Immunodiffusion and reactions with convalescent horse sera and rabbit antisera were used to identify specific polypeptides and their molecular weights.

    Main Results:

    • Both high- and low-molecular-weight protein components from S. equi preparations demonstrated protective effects in mice.
    • Convalescent horse sera reacted with S. equi polypeptides (24–29 kDa), indicating their role in bactericidal activity, while preinfection sera did not.
    • Rabbit antisera identified additional polypeptides (36–37 kDa) and revealed that M protein in culture supernatant (67, 58, and 43 kDa) might be masked, with differences observed compared to acid extracts.

    Conclusions:

    • The M protein of S. equi exists in various forms and fragments, with specific molecular weight ranges being immunologically significant.
    • The study suggests that M protein in culture supernatant may be masked by other sequences, which are removed during acid extraction.
    • Identification of common polypeptides between S. equi and Streptococcus zooepidemicus highlights potential cross-reactivity and shared virulence factors.

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