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Related Experiment Videos

Deficient polymerization of human IgM

J Rybarska, K Bobrzecka, L Konieczny

    Clinica Chimica Acta; International Journal of Clinical Chemistry
    |September 1, 1975
    PubMed
    Summary

    Low disulfide interchange activity leads to improperly cross-linked immunoglobulin M (IgM) aggregates in serum. These aggregates, stabilized by noncovalent bonds, include glycopeptides that influence their size and properties.

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    Area of Science:

    • Immunology
    • Biochemistry
    • Molecular Biology

    Background:

    • Cells producing immunoglobulin M (IgM) may exhibit low disulfide interchange activity.
    • This reduced activity can lead to the excretion of IgM molecules with deficient disulfide cross-linking.
    • IgM material in serum has been observed to form aggregates stabilized by noncovalent bonds.

    Purpose of the Study:

    • To investigate the structure and composition of IgM aggregates found in serum.
    • To determine the role of glycopeptides in the formation and properties of IgM aggregates.
    • To understand the relationship between disulfide cross-linking, glycopeptides, and IgM aggregation.

    Main Methods:

    • Analysis of IgM aggregates in serum using sedimentation coefficients.
    • Determination of molecular weight of IgM fractions via Sephadex gel filtration under mild conditions.
    • Characterization of glycopeptides associated with IgM subunits and aggregates.

    Main Results:

    • Serum IgM formed aggregates (11–19 S) and single subunits (7.1 S).
    • Single IgM subunits complexed with 2 S glycopeptides, increasing molecular weight to 270,000-280,000.
    • The ratio of glycopeptides to IgM influenced aggregate size and physicochemical properties; higher ratios correlated with lower aggregate molecular weight.

    Conclusions:

    • Deficient disulfide cross-linking in IgM production contributes to aggregate formation.
    • 2 S glycopeptides, potentially basement membrane related, are integral to IgM aggregates and influence their structure.
    • The findings provide insights into the molecular mechanisms governing IgM aggregation and stability.

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