Crystal Structure of the A Domain from Complement Factor B Reveals an Integrin-like Open Conformation.
Bhattacharya, A.A., Lupher Jr., M.L., Staunton, D.E., Liddington, R.C.(2004) Structure 12: 371-378
- PubMed: 15016353 
- DOI: 10.1016/j.str.2004.02.012
- Primary Citation of Related Structures:  
1Q0P - PubMed Abstract: 
Complement factor B is a 90 kDa protein consisting of three domains: a three-module complement control protein, a von Willebrand factor A domain, and a C-terminal serine protease (SP) domain that adopts a default inactive (zymogen) conformation. The interaction between factor B and pathogen-bound C3b is mediated by its A domain, triggering a conformational change in factor B that ultimately creates the "C3 convertase" of the alternative complement pathway ...