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Human factor H-related protein 2 (CFHR2) regulates complement activation.

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Human complement factor H-related protein 2 (CFHR2) acts as a novel regulator of the complement alternative pathway. It inhibits key enzymes and works with factor H to control complement activation, impacting diseases like AMD.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Mutations in the human complement factor H-related (CFHR) gene cluster are linked to diseases like dense deposit disease, CFHR nephropathy, and age-related macular degeneration.
  • Dysfunctional CFHR proteins can disrupt complement system regulation, contributing to disease pathogenesis.

Purpose of the Study:

  • To identify novel regulators within the CFHR gene cluster.
  • To elucidate the mechanism of action of CFHR2 in complement alternative pathway regulation.

Main Methods:

  • Biochemical assays to assess complement convertase inhibition.
  • Analysis of CFHR2 structure and C3b binding capabilities.
  • Investigating the interaction of CFHR2 with Factor H and Factor I.

Main Results:

  • CFHR2 identified as a novel alternative pathway complement regulator.
  • CFHR2 dimerizes and binds C3b, inhibiting C3 cleavage by convertases.
  • CFHR2 functions in concert with Factor H, facilitating Factor I-mediated degradation of C3b.

Conclusions:

  • CFHR2 is a significant regulator of the complement alternative and terminal pathways.
  • Understanding CFHR2's role provides insights into complement-mediated diseases.
  • CFHR2 represents a potential therapeutic target for diseases involving complement dysregulation.