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Related Experiment Videos

Structure-function relationships in adenylate cyclase systems.

M Rodbell

    Ciba Foundation Symposium
    |January 1, 1982
    PubMed
    Summary

    Hormone-sensitive adenylate cyclase systems function via hormone-recognition (R), nucleotide-regulatory (N), and catalytic (C) units, proposed to operate as dimers. Hormone and GTP actions involve dimer transitions, explaining synergistic hormone effects and spare receptors.

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    The complex structure and function of G-proteins in cellular communication.

    Bulletin et memoires de l'Academie royale de medecine de Belgique·1995

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Signaling

    Background:

    • Hormone-sensitive adenylate cyclase systems are crucial for cellular responses.
    • These systems comprise hormone-recognition (R), nucleotide-regulatory (N), and catalytic (C) units.
    • Previous studies indicated functional sizes of R and N subunits.

    Purpose of the Study:

    • To propose a model for the functional organization and activation mechanism of hormone-sensitive adenylate cyclase systems.
    • To explain the roles of R, N, and C units in hormone and GTP interactions.
    • To elucidate the molecular basis for synergistic hormone actions, spare receptors, and hormone efficacy.

    Main Methods:

    • Analysis of reported sizes of purified R and N subunits.
    • Target analysis of functional sizes of R and N units.
    • Theoretical modeling of enzyme structure and activation dynamics.

    Main Results:

    • Hormone and GTP binding/action minimally require homologous or heterologous dimers of R and N units.
    • The catalytic unit (C) is proposed to exist as a membrane-bound dimer.
    • Activation involves MgATP substrate, coupled with dimer transitions in linked R, N, and C units.

    Conclusions:

    • Hormones trigger activation by inducing dimer structures in the holoenzyme with GTP and divalent cations.
    • Realignment of activated holoenzyme units in aggregates explains synergistic hormone actions and activation of common enzymes.
    • The proposed dimer model explains spare receptors and the efficacy of hormone action.

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