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Related Experiment Videos

Binding of human and rat CD59 to the terminal complement complexes

T Lehto1, B P Morgan, S Meri

  • 1Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Finland.

Immunology
|January 1, 1997
PubMed
Summary

CD59 antigen interactions with complement components C8 and C9 show species selectivity but are not homologous restricted between humans and rats. This suggests conserved binding sites for CD59 and terminal complement components.

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Area of Science:

  • Immunology
  • Complement System
  • Molecular Interactions

Background:

  • CD59 (protectin) inhibits complement-mediated lysis by interacting with C8 and C9 during membrane attack complex formation.
  • Understanding the species specificity of CD59 interactions is crucial for studying complement regulation across different mammals.

Purpose of the Study:

  • To investigate the cross-species binding specificity of human and rat CD59 to complement components C8 and C9.
  • To determine if CD59-C8 and CD59-C9 interactions are conserved between humans and rats.

Main Methods:

  • Utilized soluble CD59 isolated from urine (CD59U) to avoid non-specific binding.
  • Employed sucrose density gradient ultracentrifugation, ligand blotting, and plate binding assays.
  • Tested binding interactions between human/rat CD59 and human/rat C8 and C9.

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Main Results:

  • Human and rat CD59U bound to both human and rat C8, with similar binding degrees.
  • CD59U binding to C9 showed species selectivity, with stronger binding to homologous C9.
  • Erythrocyte-bound CD59 (CD59E) also demonstrated weaker binding to heterologous C9.

Conclusions:

  • Reciprocal binding sites between C8 and CD59 are conserved between humans and rats.
  • CD59-C9 interactions are species selective but not exclusively homologous.
  • CD59 interactions with terminal complement components are conserved but exhibit species selectivity.