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Related Experiment Videos

Polymerization of human immunoglobulin M

C E Wilde, M E Koshland

    Biochemistry
    |August 8, 1978
    PubMed
    Summary

    Human immunoglobulin M (IgM) repolymerization requires J chain and a disulfide exchange system for intracellular polymer assembly. The extent of monomer reduction influences repolymerization, incorporating one J chain per five monomer units.

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    Area of Science:

    • Immunology
    • Biochemistry
    • Molecular Biology

    Background:

    • Immunoglobulin M (IgM) is a crucial antibody in the immune system.
    • Understanding IgM polymerization is key to comprehending its function and potential therapeutic applications.
    • Intracellular polymer assembly is a fundamental biological process.

    Purpose of the Study:

    • To investigate the requirements for human IgM repolymerization after reductive cleavage.
    • To model intracellular polymer assembly using IgM repolymerization.
    • To elucidate the role of J chain and disulfide exchange systems in IgM polymerization.

    Main Methods:

    • Mild reductive cleavage of human IgM.
    • Study of repolymerization in the presence of various disulfide exchanging systems (mercaptoethylamine, mixed disulfides, disulfide exchanging enzymes).
    • Analysis of the incorporated J chain stoichiometry.

    Main Results:

    • IgM repolymerization necessitates the presence of J chain.
    • A disulfide exchanging system, either intrinsic or extrinsic, is essential for repolymerization.
    • The degree of repolymerization is directly related to the extent of monomer reduction.
    • The final product contains one J chain covalently linked per five monomer units.
    • Disulfide exchanging enzymes likely act as a source of mixed disulfides rather than catalysts.

    Conclusions:

    • A tentative mechanism for IgM polymerization involving J chain and disulfide exchange is proposed.
    • This study provides insights into the molecular mechanisms of IgM assembly.
    • The findings contribute to the understanding of protein polymer assembly in biological systems.

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