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Related Experiment Videos

Melittin interactions with adenylate cyclase

G H Cook, J Wolff

    Biochimica Et Biophysica Acta
    |June 23, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Melittin from bee venom inhibits adenylate cyclase in thyroid membranes. Its inhibitory effect is mainly due to its detergent-like properties, not charge.

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    Area of Science:

    • Biochemistry
    • Endocrinology
    • Pharmacology

    Background:

    • Adenylate cyclase is a key enzyme in thyroid hormone regulation.
    • Melittin, a peptide from bee venom, has known biological activities.

    Purpose of the Study:

    • To investigate the effect of melittin on adenylate cyclase activity in beef thyroid membranes.
    • To determine the mechanism of melittin's action on this enzyme.

    Main Methods:

    • Enzyme kinetics assays were performed.
    • Thyroid membranes were isolated from beef.
    • Melittin's inhibitory and enhancing effects were measured at varying concentrations.

    Main Results:

    • Melittin inhibited basal and thyrotropin-stimulated adenylate cyclase with a Ki of approximately 10 µM.

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  • The inhibitory effect was primarily attributed to melittin's detergent-like properties, not charge.
  • Low concentrations (0.3-3 µM) of melittin showed a small enhancing effect.

    • Conclusions:

    • Melittin significantly impacts adenylate cyclase activity in thyroid membranes.
    • The mechanism involves physical properties (detergency) rather than solely charge interactions.
    • Melittin's dual effect (inhibition/enhancement) depends on concentration, suggesting complex biological roles.