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Related Experiment Videos

Human leucocyte alpha-L-fucosidase.

J Troost, M C van der Heijden, G E Staal

    Clinica Chimica Acta; International Journal of Clinical Chemistry
    |December 1, 1976
    PubMed
    Summary

    Human alpha-L-fucosidase from different sources shows distinct properties. Serum enzyme differs from leucocyte and urine forms, with thiol groups crucial for its activity.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Human alpha-L-fucosidase (EC 3.2.1.51) is an enzyme with various physiological roles.
    • Investigating enzyme properties aids in understanding metabolic pathways and potential disease markers.

    Purpose of the Study:

    • To characterize human alpha-L-fucosidase from leucocytes, urine, and serum.
    • To compare the biochemical and physical properties of these enzyme forms.
    • To identify factors affecting enzyme activity.

    Main Methods:

    • Enzyme assays measuring kinetic parameters (KM) and pH optima.
    • Electrophoretic analysis to determine patterns.
    • Heat stability tests.
    • Molecular weight determination using established methods.
    • Inhibition studies with metal ions and specific reagents.

    Main Results:

    • Leucocyte and urine alpha-L-fucosidase share similar properties.
    • Serum alpha-L-fucosidase exhibits distinct electrophoretic patterns, pH optima, and heat stability compared to leucocyte and urine forms.
    • The molecular weight of leucocyte alpha-L-fucosidase was found to be 80,000 +/- 5,000.
    • Cu2+, Hg2+, and PCMB strongly inhibit leucocyte alpha-L-fucosidase, with inhibition reversed by beta-mercaptoethanol.

    Conclusions:

    • Human alpha-L-fucosidase exists in distinct forms in leucocytes, urine, and serum.
    • These isoenzymes differ in their biochemical characteristics.
    • Thiol groups are essential for the catalytic activity of leucocyte alpha-L-fucosidase.

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