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Related Experiment Videos

Membrane insertion of prothrombin.

M F Lecompte, I Rosenberg, C Gitler

    Biochemical and Biophysical Research Communications
    |November 30, 1984
    PubMed
    Summary

    Prothrombin interacts with liposomes, with binding and penetration influenced by lipid composition. Calcium ions affect this interaction, suggesting a role in prothrombin

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    Praxis·2012

    Area of Science:

    • Biochemistry
    • Lipid Bilayer Studies
    • Protein-Lipid Interactions

    Background:

    • Prothrombin is a key protein in blood coagulation.
    • Understanding protein-lipid interactions is crucial for biological processes.
    • Liposomes serve as model membrane systems.

    Purpose of the Study:

    • To investigate the interaction of prothrombin with liposomes.
    • To determine the influence of calcium ions and lipid composition on this interaction.
    • To elucidate the binding and penetration behavior of prothrombin within lipid bilayers.

    Main Methods:

    • Prothrombin was labeled with the apolar reagent 5-[125I] iodonaphthyl-1-azide (INA).
    • Liposomes composed of phosphatidylcholine and varying amounts of phosphatidylserine were used.
    • The incorporation of INA into prothrombin was quantified under different conditions (calcium presence/absence, varying lipid composition).

    Main Results:

    • Prothrombin labeling by INA was higher in the absence of calcium ions when using phosphatidylcholine liposomes.
    • Increased phosphatidylserine content in liposomes significantly enhanced prothrombin labeling, regardless of calcium.
    • INA's confinement to the lipid core indicates prothrombin's penetration into the bilayer.

    Conclusions:

    • Prothrombin binds to liposomes.
    • Prothrombin penetrates the lipid bilayer of liposomes.
    • The interaction is modulated by calcium ions and the presence of anionic lipids like phosphatidylserine.

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