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Related Experiment Videos

Soluble adenylate cyclase from thyroid membranes.

R F Asbury, G H Cook, J Wolff

    The Journal of Biological Chemistry
    |August 10, 1978
    PubMed
    Summary

    Beef thyroid adenylate cyclase was solubilized using Triton N-101. The soluble enzyme retained some activation states and similar kinetic properties, indicating successful stabilization of this crucial signaling enzyme.

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    Area of Science:

    • Biochemistry
    • Cell Signaling
    • Enzymology

    Background:

    • Adenylate cyclase is a key enzyme in cellular signal transduction pathways.
    • Understanding its properties in a soluble form is crucial for studying its regulation.

    Purpose of the Study:

    • To solubilize and characterize adenylate cyclase from beef thyroid membranes.
    • To investigate the stability of enzyme activation states after solubilization.

    Main Methods:

    • Solubilization of adenylate cyclase using Triton N-101 after preactivation.
    • Enzyme characterization using sucrose density gradients, Sepharose 6B chromatography, and sedimentation analysis.
    • Comparison of kinetic parameters (Km, thermal stability, pH optimum) between membrane-bound and soluble enzyme.

    Main Results:

    • Soluble adenylate cyclase was obtained with a molecular weight of 159,000.
    • Activation by guanosine 5'-(beta, gamma-imido)triphosphate persisted in the soluble form.
    • Kinetic properties like Km for ATP and Ca2+ inhibition remained similar, while the pH optimum shifted.
    • Thyrotropin stimulation was lost upon solubilization, but the enzyme's response to polyanions and phenothiazines was retained.

    Conclusions:

    • Adenylate cyclase can be successfully solubilized while retaining key functional and regulatory properties.
    • The study provides insights into the molecular characteristics and stability of this important signaling enzyme.

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