Structure of C3b reveals conformational changes that underlie complement activity.

PEG-MME 2000, sodium acetate,
Bis-Tris propane, taurine, pH 7.8, VAPOR DIFFUSION, SITTING DROP, temperature 303K

SEQUENCE
RESIDUE 991 HAS BEEN CONVERTED FROM A GLN TO A
GLU IN THE CONVERSION OF C3 TO C3B.

HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS

There is one biological unit in the asymmetric unit

C3b consists of 12 domains, IMMUNE SYSTEM