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Related Experiment Videos

Structure-function relations in the third component of human complement (C3)-I. Hydrophobic site

M Fontaine, J P Aubert, F Joisel

    Molecular Immunology
    |January 1, 1982
    PubMed
    Summary

    Human complement C3 protein has internal hydrophobic sites that are exposed upon activation. These sites protect the thiolester bond, preserving C3

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    Area of Science:

    • Biochemistry
    • Immunology
    • Protein Chemistry

    Background:

    • The human complement system is crucial for innate immunity.
    • Complement component 3 (C3) is a central protein in complement activation.
    • Understanding C3 structure and function is vital for immunology research.

    Purpose of the Study:

    • To investigate the presence and location of hydrophobic sites in human C3.
    • To determine the role of these hydrophobic sites in C3 activation and stability.

    Main Methods:

    • Charge shift electrophoresis was employed to analyze protein properties.
    • Crossed hydrophobic interaction immuno-electrophoresis was used to assess binding to hydrophobic surfaces.
    • The effect of chaotropes on C3 was studied to understand site protection mechanisms.

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    Main Results:

    • Hydrophobic sites were identified within the human C3 molecule.
    • Activated forms (C3b, C3d) exhibited amphiphilic properties and bound to hydrophobic surfaces.
    • Native C3, despite showing amphiphilic characteristics, did not bind hydrophobic surfaces, indicating internal hydrophobic sites.
    • These internal sites were exposed upon C3 activation.
    • Chaotropes revealed that hydrophobic sites protect the thiolester bond from hydrolysis.

    Conclusions:

    • Human C3 possesses internal hydrophobic sites that become exposed upon activation.
    • These exposed sites are critical for C3's biological functions.
    • The hydrophobic sites shield the thiolester bond, ensuring the stability and efficacy of native C3.