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A new pyruvate kinase mutation with hyperactivity in the mouse.

D J Charles, W Pretsch

    Biochemical Genetics
    |December 1, 1984
    PubMed
    Summary

    A new mouse mutation causes hyperactivity in pyruvate kinase (PK), an enzyme crucial for energy production. This genetic change affects blood and liver PK activity, with significant implications for enzyme regulation studies.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Enzymology

    Background:

    • Pyruvate kinase (PK) is a key enzyme in glycolysis, essential for cellular energy production.
    • Genetic mutations can alter enzyme activity, impacting metabolic pathways.
    • Understanding enzyme regulation is critical for deciphering metabolic disorders.

    Purpose of the Study:

    • To characterize a novel mouse mutant exhibiting altered pyruvate kinase activity.
    • To investigate the tissue-specific expression and inheritance pattern of the PK mutation.
    • To explore the molecular basis of the observed PK hyperactivity.

    Main Methods:

    • Chemical mutagenesis using 1-ethyl-1-nitrosourea (ENU) in male mice.
    • Biochemical assays to measure pyruvate kinase activity in various tissues (blood, liver, muscle, kidney, heart, spleen, lung, brain).
    • Analysis of enzyme properties including heat stability, electrophoretic mobility, and kinetic parameters (Km).

    Main Results:

    • A mutation causing pyruvate kinase hyperactivity was identified in ENU-treated mouse offspring.
    • Elevated PK activity was observed in blood (heterozygotes ~160%, homozygotes ~240%) and liver, but not other tissues.
    • The mutation exhibited codominant inheritance, with viable and fertile heterozygous and homozygous mutants lacking erythrocytosis.
    • Enzyme properties like heat stability, mobility, and Km remained unchanged, suggesting a regulatory mutation.

    Conclusions:

    • The identified mutation likely affects the regulatory locus of pyruvate kinase (PK-1).
    • These findings support the hypothesis of a single structural locus for erythrocyte and liver PK isozymes.
    • This mutant provides a valuable model for studying enzyme regulation and its genetic basis.

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