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Related Experiment Videos

Natural murine interferon-gamma. Evidence for post-translational proteolytic processing.

G Gribaudo, F Cofano, M Prat

    The Journal of Biological Chemistry
    |August 15, 1985
    PubMed
    Summary

    Murine interferon-gamma (MuIFN-gamma) exists as two glycosylated protein species due to proteolytic cleavage during secretion. This processing explains the molecular heterogeneity observed in the biologically active MuIFN-gamma.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Biochemistry

    Background:

    • Murine interferon-gamma (MuIFN-gamma) is a crucial cytokine produced by T-cells.
    • Understanding the molecular characteristics of MuIFN-gamma is essential for its therapeutic applications.

    Purpose of the Study:

    • To purify and characterize the molecular forms of MuIFN-gamma.
    • To investigate the source of molecular heterogeneity in MuIFN-gamma.

    Main Methods:

    • Purification of MuIFN-gamma using rat monoclonal antibodies.
    • Sodium dodecyl sulfate-gel electrophoresis (SDS-PAGE) to determine molecular weight.
    • Glycosylation analysis using tunicamycin.
    • Peptide mapping via reverse-phase high-performance liquid chromatography (RP-HPLC).

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    Main Results:

    • Purified MuIFN-gamma consists of two protein species (Mr = 17,500 and 16,500) with retained biologic activity.
    • Both species are glycosylated, with deglycosylated forms showing reduced molecular weights.
    • MuIFN-gamma is synthesized as a single 17,500 Mr peptide and undergoes proteolytic cleavage.
    • Peptide mapping indicates high homology between the two species, suggesting post-secretory processing.

    Conclusions:

    • The molecular heterogeneity of MuIFN-gamma arises from proteolytic processing during or after secretion.
    • This processing generates distinct glycosylated forms of the cytokine.