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Human alpha-L-iduronidase. 2. Catalytic properties.

P R Clements, V Muller, J J Hopwood

    European Journal of Biochemistry
    |October 1, 1985
    PubMed
    Summary
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    Human liver alpha-L-iduronidase kinetics were studied using natural and synthetic substrates. Catalysis is essential for the carboxyl group of alpha-L-iduronic acid, with sulfate groups influencing activity.

    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Human liver alpha-L-iduronidase is crucial for glycosaminoglycan metabolism.
    • Understanding its kinetic parameters is vital for diagnosing and treating related lysosomal storage diseases.

    Purpose of the Study:

    • To determine the kinetic parameters of human liver alpha-L-iduronidase.
    • To investigate the influence of substrate structure and ionic strength on enzyme activity.
    • To elucidate the catalytic requirements and binding affinities of the enzyme.

    Main Methods:

    • Enzyme kinetics were analyzed using three disaccharide substrates derived from heparin and dermatan sulfate, and one synthetic fluorogenic substrate.
    • Kinetic parameters (Km, Vmax) were measured at optimal pH (around 4.5).
    • The effects of varying ionic strength and specific inhibitors (salts, copper chloride) on enzyme activity were assessed.

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    Main Results:

    • Enzyme activity was optimal at pH 4.5 for all substrates.
    • Km values increased significantly with ionic strength for disaccharide substrates, but less so for the synthetic substrate.
    • Vmax values remained unaffected by ionic strength.
    • The carboxyl group of alpha-L-iduronic acid is essential for catalysis, and sulfate substituents significantly influence activity.

    Conclusions:

    • The idopyranosyl residue is critical for binding to alpha-L-iduronidase.
    • Substituent groups, particularly the carboxyl moiety, are key to catalysis.
    • A model for the catalytic requirements of alpha-L-iduronidase is proposed, highlighting the importance of specific structural features for enzyme function.