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Related Experiment Videos

Coagulation factor V exists uncomplexed in bovine plasma.

T R Ittyerah, R Rawala, R W Colman

    Biochimica Et Biophysica Acta
    |February 25, 1982
    PubMed
    Summary

    Bovine coagulation factor V was studied to determine if it is a complex of two polypeptides. Research indicates factor V is a single polypeptide chain, not complexed with other proteins in plasma.

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    Area of Science:

    • Biochemistry
    • Immunochemistry
    • Molecular Biology

    Background:

    • Bovine coagulation factor V (FV) plays a crucial role in the blood clotting cascade.
    • Previous studies suggested FV might exist as a complex of multiple polypeptide chains in plasma.

    Purpose of the Study:

    • To immunochemically investigate the structure of bovine coagulation factor V.
    • To determine if the coagulant polypeptide (h) is complexed with a second distinct polypeptide (l2) in plasma.

    Main Methods:

    • Immunochemical analysis using specific antibodies against polypeptides h and l2.
    • Gel filtration chromatography of plasma with and without calcium (Ca2+) or EDTA.
    • Immunoaffinity purification using immobilized antibodies.

    Main Results:

    • Polypeptide l2 eluted earlier than polypeptide h during gel filtration, suggesting a higher molecular weight or non-interacting species.
    • Immobilized anti-l2 antibodies specifically removed only the l2 polypeptide.
    • Antibodies to h could precipitate h, but antibodies to l2 could not precipitate h, even in the presence of plasma.

    Conclusions:

    • The l2 polypeptide is not complexed with the h polypeptide in purified systems or in plasma.
    • Bovine coagulation factor V exists as a single polypeptide chain and is not complexed in plasma.

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