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Related Experiment Videos

NADH-monodehydroascorbate reductase in human erythrocyte membranes.

H Goldenberg, C Grebing, H Löw

    Biochemistry International
    |January 1, 1983
    PubMed
    Summary

    NADH-monodehydroascorbate reductase activity was found in red blood cell membranes. Detergents activated this enzyme, suggesting a role in electron transport and potential interactions with lipophilic substrates.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Enzymology

    Background:

    • Red blood cell membranes contain enzymatic activities crucial for cellular function.
    • The specific role of NADH-monodehydroascorbate reductase in these membranes was previously unclear.

    Purpose of the Study:

    • To investigate the enzymatic activity of NADH-monodehydroascorbate reductase in red blood cell membranes.
    • To understand the factors influencing its activity, including latency and detergent activation.

    Main Methods:

    • Vesicle preparation (right-side-out and inside-out) from red blood cell membranes.
    • Enzyme activity assays under various conditions (e.g., presence of detergents, metal chelators).
    • Determination of kinetic parameters, including the Michaelis constant (Km).

    Main Results:

    • NADH-monodehydroascorbate reductase activity was detected in red blood cell membrane vesicles.
    • The enzyme exhibited latency in both right-side-out and inside-out vesicles.
    • Detergents significantly activated the enzyme in open membrane preparations.
    • The enzyme was inhibited by metal chelators and showed a low apparent Km.
    • Monodehydroascorbate was identified as a potential natural electron acceptor.

    Conclusions:

    • NADH-monodehydroascorbate reductase is present and functional within red blood cell membranes.
    • Detergent-mediated activation suggests a role in membrane dynamics or substrate accessibility.
    • The enzyme's properties support its function in the transmembrane NADH-oxido-reductase system.

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