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Physical properties and function of phallolysin.

H Faulstich, H J Bühring, J Seitz

    Biochemistry
    |September 13, 1983
    PubMed
    Summary
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    Phallolysin, a cytolytic toxin from Amanita phalloides, shares properties with staphylococcal alpha-toxin. Researchers characterized its binding and cytolytic mechanism on human erythrocytes, revealing sequential steps in cell damage.

    Area of Science:

    • Biochemistry
    • Toxicology
    • Molecular Biology

    Background:

    • Phallolysin is a cytolytic protein mixture isolated from Amanita phalloides.
    • Its physical and chemical properties show similarities to staphylococcal alpha-toxin.

    Purpose of the Study:

    • To purify and characterize phallolysin.
    • To investigate the binding kinetics and mechanism of its cytolytic activity on human erythrocytes.
    • To compare phallolysin's properties with staphylococcal alpha-toxin.

    Main Methods:

    • Purification of phallolysin by isoelectric focusing.
    • Amino acid composition analysis.
    • Radioactive labeling of phallolysin using sodium [3H]borohydride.
    • Erythrocyte binding assays to determine receptor number and affinity.

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  • Kinetic and temperature dependency studies of cytolytic events.

    • Main Results:

    • Phallolysin consists of homogeneous cytolytic proteins (Mr 34,000) rich in water-soluble amino acids, lacking cysteine and methionine.
    • Binding studies revealed approximately 2 X 10(4) receptors per erythrocyte with a KD of 4 X 10(-9) M.
    • The cytolytic mechanism involves sequential binding, potassium release, and membrane rupture, with distinct kinetics and temperature dependencies.

    Conclusions:

    • Phallolysin exhibits properties similar to staphylococcal alpha-toxin.
    • The characterized binding and sequential cytolytic events provide insight into its mechanism of action.
    • Further research can leverage these findings for comparative toxicology and understanding protein toxin interactions.