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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
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Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry
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Studies on the interactions between C-reactive protein and complement proteins.

Adrienn Bíró1, Zita Rovó, Diana Papp

  • 13rd Department of Medicine, Semmelweis University, Budapest, Hungary. adrienn_biro@yahoo.com

Immunology
|January 25, 2007
PubMed
Summary

Different structural forms of C-reactive protein (CRP) influence complement activation. Disrupted CRP binds C1q and complement regulatory proteins, Factor H (FH) and C4b-binding protein (C4BP), with increased affinity, regulating complement pathways.

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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells
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Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

Published on: January 29, 2014

Area of Science:

  • Immunology
  • Biochemistry
  • Complement System

Background:

  • C-reactive protein (CRP) interactions with complement proteins are known.
  • Previous studies overlooked the impact of CRP's structural variations on these interactions.
  • Understanding these structural influences is crucial for comprehending complement regulation.

Purpose of the Study:

  • To investigate how different structural forms of CRP bind C1q.
  • To determine if various CRP forms activate the C1 complex.
  • To assess the binding of CRP variants to complement regulatory proteins Factor H (FH) and C4b-binding protein (C4BP).

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) and surface plasmon resonance (SPR) were used to analyze CRP-complement protein interactions.
  • C1 complex activation was studied using purified C1q, C1r, C1s, and C1-inhibitor (C1-INH) in a reconstituted system.
  • CRP structural integrity was altered via urea treatment and site-directed mutagenesis.

Main Results:

  • Native, ligand-unbound CRP weakly activated the classical complement pathway.
  • Phosphocholine-bound native CRP bound C1q and significantly activated C1, but did not bind FH or C4BP.
  • Disrupted CRP structures showed increased C1q binding and C1 activation, alongside revealed binding to FH and C4BP.
  • C1q binds to CRP's globular head; FH and C4BP binding sites differ from C1q's.

Conclusions:

  • CRP structural variants exhibit varying affinities for C1q and complement regulatory proteins.
  • Increased C1 activation correlates with enhanced binding of FH and C4BP to altered CRP structures.
  • These findings provide a molecular basis for regulating excessive complement activation by different CRP forms.