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Related Experiment Videos

Biotinylation of human C3

M Berger, T A Gaither, R M Cole

    Molecular Immunology
    |July 1, 1982
    PubMed
    Summary

    Biotinylated human complement C3 (biotinyl-C3) retains its biological activity and can be detected using avidin. This modified C3 protein is a valuable tool for studying complement system functions.

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    Area of Science:

    • Immunology
    • Biochemistry

    Background:

    • The complement system, particularly C3, plays a crucial role in immune responses.
    • Developing tools to study complement C3 functions is essential for understanding immune mechanisms.

    Purpose of the Study:

    • To create a biotinylated version of human complement C3 (biotinyl-C3) for use in immunological studies.
    • To evaluate the functional integrity and utility of biotinyl-C3 in various biological assays.

    Main Methods:

    • Human C3 was biotinylated using biotinyl-N-hydroxysuccinimide imidoester (BNHS).
    • Functional activity was assessed via hemolytic assays and binding to C3b receptors.
    • Biotinyl-C3 fragmentation and avidin binding were analyzed.
    • Flow cytometry and electron microscopy were employed using avidin conjugates.

    Main Results:

    • Biotinyl-C3 incorporated 3-6 biotin molecules per C3 and retained >90% hemolytic activity.
    • Biotinyl-C3 bound to erythrocytes and adhered to C3b receptors, functions blocked by avidin.
    • Biotinyl-C3 fragmented normally, with biotin present in C3c and C3d fragments.
    • Fluorescein-avidin enabled C3 fixation quantitation by flow cytometry; ferritin-avidin visualized C3b distribution.

    Conclusions:

    • Biotinylated C3 is a functional and versatile tool for complement research.
    • Avidin-based detection methods facilitate the study of C3 fixation and distribution.
    • Biotinyl-C3 and avidin derivatives offer significant potential for investigating C3's biological roles.

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