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Posttranslational modification of prothyroid hormone.

M C Eggo, D Drucker, R Cheifetz

    Canadian Journal of Biochemistry and Cell Biology = Revue Canadienne De Biochimie Et Biologie Cellulaire
    |July 1, 1983
    PubMed
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    Glycosylation is essential for thyroglobulin export and iodination, impacting its role in thyroid hormone production. These findings highlight the importance of posttranslational modifications for thyroglobulin function.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Endocrinology

    Background:

    • Thyroglobulin is a key precursor protein in thyroid hormone synthesis.
    • Posttranslational modifications of thyroglobulin are critical for its function.
    • The specific roles of glycosylation, phosphorylation, and carboxymethylation require further elucidation.

    Purpose of the Study:

    • To investigate the role of glycosylation in thyroglobulin (Tg) processing.
    • To determine how glycosylation affects Tg export from the cell.
    • To assess the impact of glycosylation on thyroglobulin iodination.

    Main Methods:

    • Studied the effects of glycosylation inhibition on thyroglobulin.
    • Monitored thyroglobulin movement within the cell.
    • Assessed the degree of thyroglobulin iodination under different conditions.

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    Main Results:

    • Glycosylation was found to be essential for the intracellular transport of thyroglobulin.
    • Thyroglobulin export from the cell is dependent on proper glycosylation.
    • Iodination of thyroglobulin requires glycosylation.

    Conclusions:

    • Glycosylation is a critical posttranslational modification for thyroglobulin function.
    • Proper glycosylation ensures efficient thyroglobulin export and iodination.
    • Other modifications like phosphorylation and carboxymethylation may also play significant roles.