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Phosphorylated lymphocyte plasma-membrane proteins

A P Johnstone, J H DuBois, M J Crumpton

    The Biochemical Journal
    |January 15, 1981
    PubMed
    Summary
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    This study investigated lymphocyte plasma membrane phosphorylation, finding that major transplantation antigens are phosphorylated. This protein phosphorylation is likely not an early event in lymphocyte growth initiation.

    Area of Science:

    • Cell Biology
    • Immunology
    • Biochemistry

    Background:

    • Lymphocyte activation involves complex signaling pathways.
    • Plasma membrane proteins play crucial roles in cell communication and function.

    Purpose of the Study:

    • To identify and characterize phosphorylated proteins in lymphocyte plasma membranes.
    • To investigate the role of protein phosphorylation in lymphocyte activation and growth initiation.

    Main Methods:

    • Lymphocytes were labeled with radioactive phosphorus ([32P]Pi) and their plasma membranes isolated.
    • Protein phosphorylation patterns were analyzed using gel electrophoresis and immunoprecipitation.
    • Phosphorylation was also studied using isolated plasma membranes incubated with [gamma-32P]ATP.

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    Main Results:

    • Two prominent phosphorylated polypeptides (52,000 and 90,000 molecular weight) were identified in lymphocyte plasma membranes.
    • Phosphorylation of glycosylated major transplantation antigens (e.g., HLA-A, HLA-B) was confirmed.
    • No significant changes in phosphorylation patterns were observed in lymphocytes within 5-30 minutes after mitogen stimulation.

    Conclusions:

    • Phosphorylation of lymphocyte plasma membrane proteins, including major transplantation antigens, is a significant cellular process.
    • Changes in plasma membrane protein phosphorylation are unlikely to be an early biochemical trigger for T- and B-lymphocyte proliferation.
    • Cyclic AMP can stimulate the rapid phosphorylation of a 90,000 molecular weight polypeptide.