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Soluble and membranous neutral beta-glucosidases.

Y Ben-Yoseph, H L Nadler

    Progress in Clinical and Biological Research
    |January 1, 1982
    PubMed
    Summary

    Researchers identified three distinct beta-glucosidase forms in human tissues. One form, deficient in Gaucher disease, acts on glucosylceramide, while others show different substrate specificities and cellular locations.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Cell Biology

    Background:

    • Beta-glucosidase is crucial for cellular metabolism.
    • Gaucher disease results from beta-glucosidase deficiency.
    • Multiple forms of beta-glucosidase exist with varying properties.

    Purpose of the Study:

    • To characterize distinct beta-glucosidase forms in human tissues.
    • To differentiate enzyme properties based on substrate specificity, molecular weight, and cellular localization.
    • To investigate the relevance of these forms in Gaucher disease.

    Main Methods:

    • Gel filtration (Bio-Gel P-150) of tissue homogenates.
    • Enzyme assays using natural (glucosylceramide) and artificial (4-methylumbelliferyl beta-D-glucoside) substrates.
    • Determination of apparent molecular weights, pH optima, and heat inactivation profiles.
    • Analysis of enzyme distribution in particulate, soluble, and membranous fractions.

    Main Results:

    • Three beta-glucosidase forms were identified: an acidic particulate form (MW ~67,000) deficient in Gaucher disease, a soluble neutral form (MW ~42,000) abundant in liver/placenta, and a high molecular weight membranous neutral form (>150,000) cleaving only artificial substrates.
    • The acidic form showed pH optima of 5.9 (glucosylceramide) and 4.2 (artificial substrate).
    • The soluble neutral form had a pH optimum of 6.2 and was less stable to heat than the other forms.

    Conclusions:

    • Human tissues contain at least three distinct beta-glucosidase forms with differing biochemical properties and cellular roles.
    • The acidic, particulate beta-glucosidase is likely the primary enzyme deficient in Gaucher disease.
    • The soluble neutral and membranous neutral forms may have distinct physiological functions unrelated to glucosylceramide metabolism.

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