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Related Experiment Videos

[Structural study of dopamine beta hydroxylase purified from human serum]

M T Miras-Portugal, D Aunis, P Mandel

    Comptes Rendus Hebdomadaires Des Seances De L'Academie Des Sciences. Serie D: Sciences Naturelles
    |January 27, 1975
    PubMed
    Summary
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    Dopamine-beta-hydroxylase (DBH) purified from human serum appears pure. This enzyme is a tetramer, with each subunit potentially comprising two polypeptide chains.

    Area of Science:

    • Biochemistry
    • Enzymology

    Context:

    • Dopamine-beta-hydroxylase (DBH) is crucial for neurotransmitter synthesis.
    • Understanding DBH structure is key to its function and regulation.

    Purpose:

    • To purify and characterize dopamine-beta-hydroxylase (DBH) from human serum.
    • To elucidate the subunit composition and molecular weight of circulating DBH.

    Summary:

    • Human serum dopamine-beta-hydroxylase (DBH) was purified to homogeneity, confirmed by polyacrylamide gel electrophoresis.
    • The native enzyme exhibits a molecular weight of 250,000.
    • Treatment with dithiothreitol dissociated DBH into 64,500 and 32,000 molecular weight species, suggesting a tetrameric structure with subunits composed of two polypeptide chains.

    Impact:

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    • Provides foundational data on the quaternary structure of human serum DBH.
    • Facilitates further research into DBH's role in physiological and pathological processes.
    • Contributes to the understanding of enzyme structure-function relationships.