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Human adenosine deaminase. Distribution and properties

M B Van der Weyden, W N Kelley

    The Journal of Biological Chemistry
    |September 25, 1976
    PubMed
    Summary

    Human adenosine deaminase exists in multiple forms, including particulate and three soluble types. The small soluble form converts to a large form, influenced by a specific protein and environmental conditions.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Adenosine deaminase (ADA) is a crucial enzyme in purine metabolism.
    • ADA exists in various molecular forms within human tissues.

    Purpose of the Study:

    • To characterize the different molecular forms of human adenosine deaminase.
    • To investigate the interconversion between soluble ADA forms and factors influencing it.

    Main Methods:

    • Enzyme purification and characterization.
    • Analysis of molecular weights and interconversion processes.
    • Isoelectric focusing for electrophoretic variant identification.
    • Kinetic analysis including pH optima.

    Main Results:

    • Three soluble ADA forms (small, intermediate, large) with distinct molecular weights were identified.
    • A particulate ADA form was also observed.
    • The small ADA form converts to the large form in the presence of a 200,000 MW protein, optimal at 4°C and pH 5.0-8.0.
    • Small ADA form predominates in high-activity preparations, while the large form is prevalent in low-activity extracts.
    • Multiple electrophoretic variants exist for both small and large ADA forms, with no organ specificity.
    • Kinetic properties are similar across soluble forms, with minor differences in pH optima.

    Conclusions:

    • Human adenosine deaminase exhibits complex molecular heterogeneity.
    • The interconversion between ADA forms is a significant characteristic, potentially impacting enzyme activity and distribution.
    • Electrophoretic variants suggest genetic or post-translational modifications, but are not organ-specific.

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