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Modulating the complement system through epitope-specific inhibition by complement C3 inhibitors.

Zhidong Chen1, Mingshuang Wang2, Wenqian Duan1

  • 1School of Pharmaceutical Sciences, Beijing Frontier Research Center for Biological Structure, and Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing, PR China.

The Journal of Biological Chemistry
|February 2, 2025
PubMed
Summary

Targeting different C3 domains offers distinct therapeutic strategies for complement-mediated diseases. Inhibiting MG4/MG5 domains broadly blocks complement pathways, while C345C domain inhibition specifically impacts the Alternative pathway.

Keywords:
complement C3complement systemepitope-specific targetingprocess-specific bioassaystructure-activity relationship (SAR)

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Area of Science:

  • Immunology
  • Biochemistry
  • Drug Discovery

Background:

  • The complement system, a key part of innate immunity, regulates microbial defense and inflammation.
  • Dysregulation of complement contributes to diseases like paroxysmal nocturnal hemoglobinuria (PNH) and geographic atrophy (GA).
  • Complement C3 is a central target for therapeutic intervention due to its role in all activation pathways.

Purpose of the Study:

  • To elucidate the mechanisms of C3 inhibition by targeting diverse epitopes.
  • To facilitate the rational design of C3-targeted therapeutics for complement-related diseases.
  • To understand the structure-activity relationship (SAR) of C3 inhibitors.

Main Methods:

  • Development of comprehensive biochemical assays to analyze complement cascade steps.
  • Utilizing three model inhibitors (MIs) targeting distinct C3 epitopes.
  • Assessing the pharmacological consequences of C3 inhibition at each stage of the cascade.

Main Results:

  • Inhibition of C3 MG4/MG5 domains demonstrated potent efficacy across all complement activation pathways by disrupting C3-C3 convertase interaction.
  • Inhibition of the C345C domain showed biased efficacy towards Alternative pathway (AP) inhibition by impairing AP C3 proconvertase formation.
  • Differential impacts of C3 epitope inhibition on complement cascade function were elucidated.

Conclusions:

  • Targeting the MG4/MG5 domains provides broad-spectrum complement inhibition.
  • Targeting the C345C domain offers a more specific approach for Alternative pathway-driven diseases.
  • These findings provide critical insights for developing targeted C3 therapeutics.