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Related Experiment Videos

Properties of mouse alpha-galactosidase

A J Lusis, K Paigen

    Biochimica Et Biophysica Acta
    |July 21, 1976
    PubMed
    Summary

    Mouse alpha-galactosidase, similar to human forms, exhibits tissue-specific properties. This enzyme

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Alpha-galactosidase enzyme activity and characteristics are crucial for understanding various metabolic processes.
    • Investigating tissue-specific enzyme variations aids in comprehending physiological and pathological differences.

    Purpose of the Study:

    • To characterize alpha-galactosidase from murine tissues, focusing on its biochemical properties and tissue distribution.
    • To compare murine alpha-galactosidase with its human counterpart.

    Main Methods:

    • Enzyme purification using Concanavalin A-Sepharose chromatography.
    • Characterization of enzyme kinetics, including pH optimum and Km.
    • Electrophoretic analysis and molecular weight determination via gel filtration.
    • Subcellular fractionation to determine enzyme localization.

    Main Results:

    • Murine liver alpha-galactosidase was purified 467-fold, exhibiting properties similar to human alpha-galactosidase A.
    • Enzyme activity showed a pH optimum of 4.2, with a Km of 1.4 mM.
    • Tissue-specific electrophoretic mobilities were observed, which were normalized after neuraminidase treatment, indicating varying sialylation.
    • Molecular weight varied (70,000–320,000 Da) due to pH- and ionic strength-dependent aggregation.
    • Liver enzyme was predominantly lysosomal, while kidney enzyme was found in both lysosomal and microsomal fractions.

    Conclusions:

    • Murine alpha-galactosidase shares key characteristics with the human enzyme, suggesting conserved functional domains.
    • Sialylation differences contribute to tissue-specific electrophoretic profiles.
    • Enzyme aggregation influences its molecular weight and potentially its function.
    • Distinct subcellular localization in liver and kidney suggests tissue-specific roles.

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