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Related Experiment Videos

Toxins which activate adenylate cyclase.

D M Gill, M Woolkalis

    Ciba Foundation Symposium
    |January 1, 1985
    PubMed
    Summary

    Cholera toxin and similar toxins ADP-ribosylate Ns, a regulator of adenylate cyclase, requiring guanine nucleotide triphosphate. Pertussis toxin ADP-ribosylates Ni, another cyclase regulator, with distinct effects.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Signaling

    Background:

    • Cholera toxin and other heat-labile enterotoxins share an A5B subunit structure.
    • These toxins catalyze mono ADP-ribosylation of Ns, a key regulator of adenylate cyclase.

    Purpose of the Study:

    • To elucidate the mechanism of ADP-ribosylation by enterotoxins.
    • To investigate the role of guanine nucleotide triphosphate (GTP) and other factors in the ADP-ribosylation process.
    • To compare the actions of cholera toxin and pertussis toxin on adenylate cyclase regulators.

    Main Methods:

    • ADP-ribosylation assays using erythrocyte membranes.
    • Extraction and characterization of factors involved in ADP-ribosylation.
    • Analysis of toxin interactions with cellular regulators.

    Main Results:

    • Both Ns and other proteins are ADP-ribosylated, with varying rates.
    • GTP is essential for ADP-ribosylation, binding to a membrane site ('S') cooperatively with cytosolic factor (CF).
    • Pertussis toxin ADP-ribosylates Ni, preventing inhibition of adenylate cyclase by hormones; this is independent of Ns ADP-ribosylation.

    Conclusions:

    • Enterotoxins utilize a GTP-dependent mechanism involving membrane and cytosolic factors for ADP-ribosylation.
    • ADP-ribosylation of Ns and Ni are distinct processes with independent regulation.
    • Understanding these mechanisms is crucial for deciphering cellular signaling pathways.

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