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Interaction between the third complement protein and cell surface macromolecules.

S K Law, R P Levine

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1977
    PubMed
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    The activated third complement protein (C3b) forms a stable complex with cell membranes and particles like zymosan. This robust C3b complex can be broken by specific chemical treatments, revealing its interaction types.

    Area of Science:

    • Immunology
    • Biochemistry

    Background:

    • The complement system is crucial for innate and adaptive immunity.
    • Complement protein C3 is a central component, with its activated form (C3b) playing key roles in opsonization and immune complex formation.

    Purpose of the Study:

    • To characterize the stability and nature of the complex formed between activated C3b and particulate entities.
    • To identify conditions and chemical agents capable of disrupting this C3b complex.

    Main Methods:

    • Formation of C3b complexes with zymosan and plasma membrane components.
    • Testing the stability of the C3b complex under various conditions (detergents, denaturants, temperature, salt, pH).
    • Assessing disruption of the complex using hydroxylamine and ammonolysis followed by SDS treatment.

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    Main Results:

    • The C3b complex demonstrated remarkable stability against harsh physical and chemical conditions.
    • Hydroxylamine and ammonolysis/SDS treatment were effective in breaking the C3b complex.
    • These findings suggest the complex involves both hydrophobic interactions and a bond susceptible to nucleophilic attack.

    Conclusions:

    • The C3b complex exhibits significant resistance to dissociation, indicating a strong interaction.
    • The susceptibility to specific chemical agents points to a dual binding mechanism involving hydrophobic forces and a nucleophile-sensitive bond.