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Human liver arginiosuccinase purification and partial characterization

A G Palekar, S Mantagos

    The Journal of Biological Chemistry
    |September 10, 1981
    PubMed
    Summary

    Human liver argininosuccinase was purified and characterized, revealing a tetrameric structure. Unlike bovine variants, the human enzyme displays normal Michaelis-Menten kinetics, crucial for urea cycle function.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Human Physiology

    Background:

    • Argininosuccinase is a key enzyme in the urea cycle, essential for ammonia detoxification.
    • Understanding human argininosuccinase properties is vital for metabolic disorder research.

    Purpose of the Study:

    • To purify and characterize argininosuccinase from normal human liver.
    • To compare its properties with bovine liver argininosuccinase.
    • To elucidate its kinetic behavior and subunit structure.

    Main Methods:

    • Enzyme purification using standard biochemical techniques.
    • Molecular weight determination via gel filtration.
    • Subunit analysis using SDS-polyacrylamide gel electrophoresis.

    Main Results:

    • Human liver argininosuccinase has a native molecular weight of 200,000 Da and a tetrameric structure (4x50,000 Da subunits).
    • The enzyme is cold-inactivated and thermally reactivated, similar to bovine enzyme.
    • Exhibits normal Michaelis-Menten kinetics with an apparent Km of 0.1 mM for L-argininosuccinate, unaffected by GTP.

    Conclusions:

    • Human liver argininosuccinase is a tetramer with distinct kinetic properties compared to its bovine counterpart.
    • The enzyme's normal Michaelis-Menten kinetics are significant for urea cycle efficiency.
    • Characterization provides a baseline for studying enzyme deficiencies or mutations.

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