Structural Basis for Complement Factor I Control and its Disease-Associated Sequence Polymorphisms.
Roversi, P., Johnson, S., Caesar, J.J., Mclean, F., Leath, K.J., Tsiftsoglou, S.A., Morgan, B.P., Harris, C.L., Sim, R.B., Lea, S.M.(2011) Proc Natl Acad Sci U S A 108: 12839
- PubMed: 21768352 
- DOI: 10.1073/pnas.1102167108
- Primary Citation of Related Structures:  
2XRC - PubMed Abstract: 
The complement system is a key component of innate and adaptive immune responses. Complement regulation is critical for prevention and control of disease. We have determined the crystal structure of the complement regulatory enzyme human factor I (fI). FI is in a proteolytically inactive form, demonstrating that it circulates in a zymogen-like state despite being fully processed to the mature sequence ...