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Related Experiment Videos

Interaction of C3b(2)--IgG complexes with complement proteins properdin, factor B and factor H: implications for

E Jelezarova1, A Vogt, H U Lutz

  • 1Institute of Biochemistry, Swiss Federal Institute of Technology, ETH-Zentrum, CH 8092, Zurich, Switzerland.

The Biochemical Journal
|June 22, 2000
PubMed
Summary

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C3b(2)--IgG complexes enhance complement activation by binding properdin and factor B. These complexes form a more potent C3 convertase, prolonging the complement amplification loop compared to free C3b.

Area of Science:

  • Immunology
  • Biochemistry

Background:

  • Nascent C3b forms ester bonds with target molecules.
  • C3b(2)--IgG complexes are major covalent products of C3 activation in serum.

Purpose of the Study:

  • To investigate the binding of alternative pathway proteins to C3b(2)--IgG complexes.
  • To determine the impact of these interactions on complement activation.

Main Methods:

  • Purified C3b(2)--IgG complexes were generated using biotinylated IgG.
  • Avidin-coated plates were used to capture the complexes for protein binding studies.
  • Binding assays were performed under varying pH and ionic strength conditions.

Main Results:

  • Properdin bound efficiently to C3b(2)--IgG complexes, with bivalent binding preferred at lower ratios.

Related Experiment Videos

  • Properdin binding was independent of factors H and B, but it strongly stimulated factor B binding.
  • C3b(2)--IgG complexes formed potent C3 convertase precursors, significantly enhancing C3 cleavage in the presence of properdin.

    • Conclusions:

    • C3b(2)--IgG complexes serve as effective platforms for alternative pathway protein assembly.
    • Properdin enhances factor B binding and contributes to the formation of a more active C3 convertase.
    • These complexes can sustain the complement amplification loop longer than free C3b, suggesting a role in robust immune responses.