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Related Experiment Videos

Human plasma gelsolin binds to fibronectin.

S E Lind, P A Janmey

    The Journal of Biological Chemistry
    |November 10, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Human plasma gelsolin, an actin-binding protein, forms a complex with fibronectin. This interaction may help target gelsolin to inflammatory sites where fibronectin is present.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Protein Interactions

    Background:

    • Gelsolin is a 93,000-dalton actin-binding protein found in human plasma.
    • Fibronectin is a key component of the extracellular matrix involved in cell adhesion and tissue repair.

    Purpose of the Study:

    • To investigate the interaction between human plasma gelsolin and human plasma fibronectin.
    • To determine the functional consequences of this interaction on gelsolin's binding properties.

    Main Methods:

    • Quasi-elastic light scattering
    • Sucrose gradient sedimentation
    • Gel filtration chromatography
    • Fibronectin polymerization assays
    • Solid-phase binding studies

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    Main Results:

    • Gelsolin and fibronectin form a stable complex in solution.
    • Both plasma and macrophage gelsolin bind immobilized fibronectin with a dissociation constant (Kd) of approximately 1 microM in a 1:1 ratio.
    • Fibronectin does not impede gelsolin's interaction with actin.
    • Fibronectin enhances gelsolin binding to fibrin clots.

    Conclusions:

    • Human plasma gelsolin binds to fibronectin, forming a 1:1 complex.
    • This binding interaction may serve to localize plasma gelsolin to fibronectin-rich areas, such as sites of inflammation.
    • The interaction does not interfere with gelsolin's actin-binding activity.