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Related Experiment Videos

Dopamine-beta-hydroxylase: a tetrameric glycoprotein.

E F Wallace, M J Krantz, W Lovenberg

    Proceedings of the National Academy of Sciences of the United States of America
    |August 1, 1973
    PubMed
    Summary

    Dopamine-beta-hydroxylase, an enzyme from bovine adrenal glands, was purified and characterized. This research reveals it is a tetrameric glycoprotein containing copper and carbohydrates.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Dopamine-beta-hydroxylase (DBH) is a key enzyme in catecholamine biosynthesis.
    • Understanding DBH's structure is crucial for its function and regulation.

    Purpose of the Study:

    • To isolate and characterize pure dopamine-beta-hydroxylase from bovine adrenal glands.
    • To determine the subunit composition and molecular properties of DBH.

    Main Methods:

    • Protein isolation and purification from bovine adrenal glands.
    • Sodium dodecyl sulfate-gel electrophoresis for molecular weight determination.
    • Analysis of carbohydrate and copper content.

    Main Results:

    • Pure dopamine-beta-hydroxylase was successfully isolated.
    • SDS-PAGE indicated a subunit molecular weight of approximately 75,000 Da.
    • The enzyme is a glycoprotein containing mannose, glucosamine, galactose, glucose, fucose, and sialic acid.
    • Approximately 4 copper atoms were found per enzyme molecule.

    Conclusions:

    • Dopamine-beta-hydroxylase is a tetrameric glycoprotein.
    • The native enzyme (290,000 Da) is composed of four subunits of approximately 75,000 Da each.

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