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Related Experiment Videos

Isolation and initial characterization of a lymphocyte cap structure.

G J Bourguignon, L Y Bourguignon

    Biochimica Et Biophysica Acta
    |August 6, 1981
    PubMed
    Summary

    Researchers developed a new method to isolate cell surface caps using density gradient centrifugation. This technique enriches plasma membrane proteins, revealing specific phosphorylated proteins accumulate in these caps.

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    Selective down-regulation of IP(3)receptor subtypes by caspases and calpain during TNF alpha -induced apoptosis of human T-lymphoma cells.

    Cell calcium·2000

    Area of Science:

    • Cell Biology
    • Biochemistry
    • Immunology

    Background:

    • Cell surface receptors can redistribute upon ligand binding, forming localized patches called caps.
    • Understanding the molecular composition of these caps is crucial for deciphering cell signaling and membrane dynamics.

    Purpose of the Study:

    • To develop and validate a method for isolating polycationized ferritin-induced caps from mouse T-lymphoma cells.
    • To analyze the protein composition of the isolated cap structures.

    Main Methods:

    • Utilized a density perturbation approach involving one-step density gradient centrifugation with metrizamide.
    • Isolated cap fractions were analyzed for plasma membrane enrichment and protein composition.

    Main Results:

    • The method achieved a 20-fold enrichment of plasma membrane in the isolated cap fraction.
    • Approximately 30 membrane-bound polypeptides were specifically associated with the cap fraction.
    • Four phosphorylated membrane-bound polypeptides (130K, 100K, 30K, 20K) were preferentially accumulated in the caps.

    Conclusions:

    • The described method effectively isolates lymphocyte caps, providing a tool for studying membrane protein redistribution.
    • The findings support the selective redistribution of specific membrane proteins, including phosphorylated ones, during lymphocyte capping.

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