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Calcium-induced changes in thyroglobulin conformation.

S Formisano, B Di Jeso, R Acquaviva

    Archives of Biochemistry and Biophysics
    |December 1, 1983
    PubMed
    Summary
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    Divalent cations like calcium alter thyroglobulin properties, including solubility and sedimentation, in polyethylene glycol solutions. Monovalent cations show no significant effect, suggesting increased molecular compactness of thyroglobulin.

    Area of Science:

    • Biochemistry
    • Protein Chemistry

    Background:

    • Thyroglobulin is a key protein in thyroid hormone synthesis.
    • Understanding how environmental factors affect thyroglobulin structure is crucial for thyroid research.

    Purpose of the Study:

    • To investigate the impact of mono- and divalent cations on thyroglobulin properties.
    • To explore the utility of polyethylene glycol in detecting protein conformational changes.

    Main Methods:

    • Utilized 10% (w/v) polyethylene glycol solutions.
    • Measured changes in thyroglobulin solubility, sedimentation rate, and Stokes' radius.
    • Tested the effects of varying concentrations of calcium and monovalent cations.

    Main Results:

    • Calcium ( < 0.05 M) significantly modified thyroglobulin solubility, sedimentation rate, and Stokes' radius.

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  • Monovalent cations (up to 0.6 M) did not affect these properties.
  • Polyethylene glycol facilitated the detection of cation-induced conformational changes.

    • Conclusions:

    • Divalent cations, specifically calcium, induce conformational changes in thyroglobulin, leading to increased molecular compactness.
    • Polyethylene glycol is an effective tool for identifying structural alterations in proteins like thyroglobulin.