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Calmodulin binding to platelet plasma membranes

S Grinstein, W Furuya

    Biochimica Et Biophysica Acta
    |March 23, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Platelet plasma membranes bind calmodulin, a calcium-dependent process involving a 149,000 MW protein. This binding, inhibited by phenothiazines, suggests calmodulin

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Molecular Biology

    Background:

    • Calmodulin is a key calcium-binding protein involved in cellular signaling.
    • Platelets play critical roles in hemostasis and thrombosis.
    • Understanding calmodulin's role in platelets is essential for comprehending platelet function.

    Purpose of the Study:

    • To investigate the presence and characteristics of calmodulin binding to platelet plasma membranes.
    • To identify calmodulin-binding proteins within the platelet plasma membrane.
    • To explore the potential role of calmodulin in platelet activation.

    Main Methods:

    • Isolation of platelet plasma membranes using glycerol lysis and density gradient centrifugation.
    • In vitro binding assays using 125I-labeled calmodulin with varying Ca2+ concentrations and inhibitors.

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  • Identification of calmodulin-binding polypeptides via gel overlay technique.
  • Characterization of binding kinetics (Kd, Bmax) and inhibition by calmodulin antagonists.

    • Main Results:

    • Calmodulin copurifies with platelet plasma membranes and binds in a Ca2+-dependent manner.
    • Specific, saturable calmodulin binding exhibits an apparent Kd of 27 nM and 15.9 pmol binding sites/mg protein.
    • A major Ca2+-dependent calmodulin-binding polypeptide of 149,000 MW was identified, inhibited by phenothiazines.
    • Binding is reduced by Mg2+ or excess unlabeled calmodulin and inhibited by trifluoperazine and chlorpromazine.

    Conclusions:

    • Platelet plasma membranes possess specific calmodulin-binding sites, primarily on a 149,000 MW protein.
    • Calmodulin binding is Ca2+-dependent and sensitive to calmodulin antagonists, suggesting a regulatory role.
    • Further research is warranted to elucidate calmodulin's precise function in platelet activation and signaling pathways.