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Related Experiment Videos

Human adenosine deaminase. Purification and subunit structure.

P E Daddona, W N Kelley

    The Journal of Biological Chemistry
    |January 10, 1977
    PubMed
    Summary

    Human erythrocyte adenosine deaminase was purified 800,000-fold using antibody affinity chromatography. The highly purified enzyme retained identical properties to impure preparations, indicating homogeneity.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Adenosine deaminase (ADA) is a crucial enzyme in purine metabolism.
    • Understanding ADA's properties is vital for comprehending its biological role.

    Purpose of the Study:

    • To highly purify human erythrocyte adenosine deaminase.
    • To characterize the purified enzyme and compare its properties to impure forms.

    Main Methods:

    • Antibody affinity chromatography was employed for enzyme purification.
    • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was used to assess purity and molecular weight.
    • Enzyme kinetics and physical properties were measured.

    Main Results:

    • Human erythrocyte adenosine deaminase was purified approximately 800,000-fold to apparent homogeneity.
    • The enzyme consists of a single polypeptide chain with a molecular weight of ~38,000.
    • Purified enzyme exhibited identical kinetic and physical properties (pH optimum, Km, Ki, Stokes radius, sedimentation coefficient) compared to impure preparations.
    • Three electrophoretic forms were indistinguishable by SDS-PAGE under reducing conditions.

    Conclusions:

    • Highly purified human erythrocyte adenosine deaminase maintains its native enzymatic and physical characteristics.
    • Antibody affinity chromatography is an effective method for purifying functional adenosine deaminase.
    • The enzyme's homogeneity was confirmed through rigorous biochemical and biophysical analyses.

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