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A straightforward radiometric technique for measuring IMP dehydrogenase.

D A Cooney, Y Wilson, E McGee

    Analytical Biochemistry
    |April 15, 1983
    PubMed
    Summary

    Researchers biosynthesized [2-3H]inosinic acid ([2-3H]IMP) for a sensitive assay of IMP dehydrogenase. Pancreas showed the highest enzyme activity among mouse organs tested.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Metabolic pathways

    Background:

    • Hypoxanthine-guanine phosphoribosyl transferase (HGPRT) is crucial for purine salvage pathways.
    • Inosinic acid (IMP) dehydrogenase (IMPDH) is a key enzyme in de novo purine biosynthesis.
    • Accurate and sensitive assays are needed to study enzyme activity in various tissues.

    Purpose of the Study:

    • To develop a novel assay for measuring IMP dehydrogenase activity.
    • To biosynthesize radiolabeled inosinic acid ([2-3H]IMP) for use in the assay.
    • To determine the distribution and specific activity of IMP dehydrogenase in mouse organs.

    Main Methods:

    • Biosynthesis of [2-3H]IMP from [2-3H]hypoxanthine and PRPP using mouse brain HGPRT.
    • Purification of [2-3H]IMP using paper chromatography.
    • Development of an assay measuring [3H]H2O production from [3H]IMP oxidation, with NAD as cofactor and allopurinol for side reaction inhibition.
    • Quantitative microdistillation for isolating [3H]H2O.
    • Measurement of IMPDH activity across various mouse organs.

    Main Results:

    • Successfully synthesized [2-3H]IMP with good yield.
    • Developed a facile, sensitive, and accurate assay capable of detecting as little as 1 pmol of [3H]IMP dehydrogenation.
    • Identified pancreas as the organ with the highest specific activity of IMP dehydrogenase.

    Conclusions:

    • The developed assay provides a sensitive method for quantifying IMP dehydrogenase activity.
    • The distribution study reveals significant variations in IMPDH activity across mouse organs.
    • Pancreatic IMPDH activity is notably higher than in other tested organs, suggesting potential tissue-specific roles.

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