Complement driven by conformational changes

Piet Gros, Fin J Milder, Bert J C Janssen

Research output: Contribution to journalReview articlepeer-review


Complement in mammalian plasma recognizes pathogenic, immunogenic and apoptotic cell surfaces, promotes inflammatory responses and marks particles for cell lysis, phagocytosis and B-cell stimulation. At the heart of the complement system are two large proteins, complement component C3 and protease factor B. These two proteins are pivotal for amplification of the complement response and for labelling of the target particles, steps that are required for effective clearance of the target. Here we review the molecular mechanisms of complement activation, in which proteolysis and complex formation result in large conformational changes that underlie the key offensive step of complement executed by C3 and factor B. Insights into the mechanisms of complement amplification are crucial for understanding host defence and pathogen immune evasion, and for the development of complement-immune therapies.

Original languageEnglish
Pages (from-to)48-58
Number of pages11
JournalNature reviews. Immunology
Issue number1
Publication statusPublished - Jan 2008
Externally publishedYes


  • animals
  • complement activation/immunology
  • complement C3/immunology
  • complement factor B/immunology
  • humans


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