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Related Experiment Videos

Human plasma carboxypeptidase N. Isolation and characterization.

T H Plummer, M Y Hurwitz

    The Journal of Biological Chemistry
    |June 10, 1978
    PubMed
    Summary

    Human plasma carboxypeptidase N, an enzyme crucial for protein regulation, was purified from outdated plasma. This study details its isolation, composition, and stability, offering insights into its biochemical properties.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Human plasma carboxypeptidase N (Cpn) plays a role in protein homeostasis.
    • Understanding Cpn's properties is essential for its potential therapeutic applications.

    Purpose of the Study:

    • To purify and characterize human plasma carboxypeptidase N.
    • To determine the enzyme's subunit composition, carbohydrate content, and stability.

    Main Methods:

    • Purification using DEAE-cellulose chromatography and affinity chromatography (p-aminobenzoyl-L-arginine-Sepharose 6B).
    • Analysis of amino acid and carbohydrate composition.
    • Determination of subunit molecular weights (Mr).

    Main Results:

    • Achieved a 2,600-fold purification with a 30% yield.
    • Carbohydrate constitutes 17% of the enzyme's weight.
    • The enzyme comprises three subunits (Mr = 83,000, 55,000, and 49,000) and contains bound zinc.
    • Purified enzyme is sensitive to proteolysis but stable at 4°C for 3 months.

    Conclusions:

    • Successfully purified human plasma carboxypeptidase N.
    • Characterized its multi-subunit structure and glycosylation.
    • Established its stability under specific storage conditions.

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