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Related Experiment Videos

Factor VIII recombination after dissociation by CaCl12.

H A Cooper, T R Griggs, R H Wagner

    Proceedings of the National Academy of Sciences of the United States of America
    |August 1, 1973
    PubMed
    Summary

    Calcium ions (Ca2+) dissociate large Factor VIII molecules into a carrier protein and an active fragment. These components can recombine, indicating a true dissociation, not enzymatic degradation, crucial for understanding Factor VIII function.

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    Area of Science:

    • Biochemistry
    • Hematology
    • Protein Chemistry

    Background:

    • Factor VIII is a large protein complex essential for blood coagulation.
    • Previous research suggested dissociation of Factor VIII under specific conditions.

    Purpose of the Study:

    • To investigate the dissociation mechanism of Factor VIII using calcium ions (Ca2+).
    • To determine if the dissociation is enzymatic or a true molecular separation.
    • To characterize the active fragment of Factor VIII and its recombination potential.

    Main Methods:

    • Factor VIII preparation from canine plasma using various anticoagulants and adsorption.
    • Dissociation of Factor VIII using 0.25 M Ca2+.
    • Gel chromatography for molecular weight determination and separation.

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  • Analysis of activity in hemophilic plasma preparations.

    • Main Results:

    • Ca2+ dissociation yielded a large carrier protein and a smaller active fragment (~100,000 MW).
    • Dissociation was confirmed not to be due to enzymatic degradation.
    • Separated components recombined upon Ca2+ removal to reform active Factor VIII.

    Conclusions:

    • Ca2+ induces a true dissociation of Factor VIII, not enzymatic cleavage.
    • The active fragment retains Factor VIII coagulant activity.
    • Recombination of components demonstrates the reversible nature of Ca2+-mediated dissociation.