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Related Experiment Videos

Human serum alpha-L-fucosidase.

J A Alhadeff, A J Janowsky

    Clinica Chimica Acta; International Journal of Clinical Chemistry
    |January 2, 1978
    PubMed
    Summary

    Researchers purified human serum alpha-L-fucosidase using affinity chromatography. The enzyme exhibits distinct properties, including multiple forms and subunit composition, relevant for understanding its biological role.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Alpha-L-fucosidase is a crucial enzyme involved in glycoprotein metabolism.
    • Understanding the properties of human serum alpha-L-fucosidase is important for diagnostic and therapeutic applications.

    Purpose of the Study:

    • To purify and characterize human serum alpha-L-fucosidase.
    • To compare its properties with the liver isoenzyme.

    Main Methods:

    • Affinity chromatography using agarose-epsilon-aminocaproyl-fucosamine for purification.
    • Isoelectric focusing, SDS-PAGE, and gel filtration for characterization.
    • Enzyme activity assays and immunoprecipitation.

    Main Results:

    • Achieved a 241,200-fold purification with 35% yield.
    • Identified multiple enzyme forms, with the predominant one at pI 5.0.
    • Determined subunit molecular weights of 56,500 and 54,000 Da.
    • Apparent Michaelis constant (Km) of 0.52 mM and pH optima at 4.8 and 6.1.
    • Apparent molecular weight of 296,000 +/- 30,000 Da by gel filtration.
    • Demonstrated immunological identity with liver alpha-L-fucosidase.
    • Quantified sialic acid content, finding it twice that of the liver enzyme.

    Conclusions:

    • Human serum alpha-L-fucosidase can be effectively purified using affinity chromatography.
    • The purified enzyme possesses distinct biochemical and physical properties.
    • Immunological similarity suggests a common origin or structural relationship with the liver isoenzyme.

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