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Porcine thyroid fucosidase

D S Grove, G S Serif

    Biochimica Et Biophysica Acta
    |December 15, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Porcine thyroid alpha-L-fucosidase, a glycoprotein enzyme, was purified and characterized. It functions in thyroglobulin degradation by removing L-fucose units from partially degraded protein.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Glycobiology

    Background:

    • Thyroglobulin is a major thyroid glycoprotein involved in thyroid hormone synthesis.
    • The degradation of thyroglobulin releases various components, including carbohydrates.
    • Understanding the enzymes involved in thyroglobulin catabolism is crucial for thyroid physiology.

    Purpose of the Study:

    • To isolate and purify alpha-L-fucosidase from porcine thyroid tissue.
    • To characterize the biochemical properties of the purified enzyme.
    • To elucidate the role of alpha-L-fucosidase in thyroglobulin degradation.

    Main Methods:

    • Purification using ion exchange, affinity, and molecular sieve chromatography.
    • Enzyme characterization including pH optimum and substrate specificity.

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  • Molecular weight determination using SDS electrophoresis and density gradient centrifugation.
  • Assessment of enzyme activity on thyroglobulin and its derivatives.

    • Main Results:

    • Alpha-L-fucosidase was purified 10,800-fold and appeared homogeneous by SDS-PAGE, though isoelectric focusing revealed heterogeneity.
    • The enzyme is a glycoprotein tetramer with an estimated molecular weight of 192,000 +/- 3,000.
    • Optimal activity was observed at pH 5.1, with high specificity for alpha-linked L-fucose units.
    • Sulfhydryl and carboxyl groups are essential for enzyme activity.
    • The enzyme does not directly degrade intact thyroglobulin but removes fucosyl residues from partially degraded protein.

    Conclusions:

    • Purified porcine thyroid alpha-L-fucosidase is a glycoprotein tetramer with specific activity towards alpha-L-fucose linkages.
    • The enzyme plays a role in the catabolism of thyroglobulin, specifically in the removal of fucose residues during protein degradation.
    • This salvage role contributes to the overall breakdown of thyroid glycoproteins.