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Studies on epsilon-prototoxin of Clostridium perfringens type D. Physicochemical and chemical properties of

A F Habeeb

    Biochimica Et Biophysica Acta
    |November 18, 1975
    PubMed

    Insights

    The epsilon-prototoxin from Clostridium perfringens type D was characterized. Its molecular weight was determined using ultracentrifugation and gel filtration, with discrepancies attributed to Sephadex adsorption.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Microbiology

    Background:

    • Clostridium perfringens type D produces epsilon-prototoxin, a key virulence factor.
    • Understanding the physicochemical properties of epsilon-prototoxin is crucial for developing countermeasures.

    Purpose of the Study:

    • To characterize the epsilon-prototoxin of Clostridium perfringens type D.
    • To determine its molecular weight and investigate potential discrepancies in measurement methods.

    Main Methods:

    • Amino acid composition analysis.
    • Ultracentrifugation (sedimentation velocity and equilibrium).
    • Gel filtration chromatography (Sephadex G-100).

    Main Results:

    • Epsilon-prototoxin is a single polypeptide chain of 311 amino acids.
    • Ultracentrifugation yielded a molecular weight of approximately 33,000-34,250 Da.
    • Gel filtration resulted in lower molecular weights (25,000-27,500 Da), attributed to adsorption onto Sephadex.

    Conclusions:

    • The study provides detailed physicochemical characterization of epsilon-prototoxin.
    • Discrepancies in molecular weight determination highlight the importance of considering protein-matrix interactions in gel filtration.

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