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Related Experiment Videos

Posttranslational processing of the insulin proreceptor.

M D Lane, G V Ronnett, R A Kohanski

    Current Topics in Cellular Regulation
    |January 1, 1985
    PubMed
    Summary

    Glycosylation is essential for insulin proreceptor processing and function. Without it, the proreceptor cannot mature or reach the cell surface, highlighting its crucial role in forming active insulin receptors.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Molecular Endocrinology

    Background:

    • Insulin receptor function is critical for glucose homeostasis.
    • Post-translational modification of receptors is vital for their activity.
    • 3T3-L1 adipocytes are a model system for studying insulin signaling.

    Purpose of the Study:

    • To investigate the post-translational processing of the insulin proreceptor.
    • To elucidate the role of glycosylation in the formation of the active insulin receptor.
    • To understand the pathway from proreceptor to mature, functional insulin receptor.

    Main Methods:

    • Metabolic labeling with 35S-methionine.
    • Treatment with tunicamycin to inhibit glycosylation.
    • Analysis of protein size and modifications using SDS-PAGE and enzyme treatments (Endoglycosidase H, neuraminidase).

    Main Results:

    • Insulin proreceptor undergoes sequential processing, including N-linked glycosylation, proteolytic cleavage, and sialylation.
    • Tunicamycin treatment blocks glycosylation, leading to an inactive aglyco proreceptor that does not mature or reach the cell surface.
    • Mature insulin receptor subunits (alpha and beta) are formed through these modifications, with glycosylation being critical for intracellular transport and processing.

    Conclusions:

    • N-linked oligosaccharide chains are indispensable for the proper intracellular translocation and proteolytic cleavage of the insulin proreceptor.
    • Glycosylation is a prerequisite for the formation of a functional insulin receptor.
    • Disruption of glycosylation prevents the assembly and cell surface expression of active insulin receptors.

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