Structural and thermodynamic characterization of pre- and postpolymerization states in the F4 fimbrial subunit FaeG.
Enterotoxigenic Escherichia coli expressing F4 fimbriae are the major cause of porcine colibacillosis and are responsible for significant death and morbidity in neonatal and postweaned piglets. Via the chaperone-usher pathway, F4 fimbriae are assembled into thin, flexible polymers mainly composed of the single-domain adhesin FaeG. The F4 fimbrial system has been labeled eccentric because the F4 pilins show some features distinct from the features of pilins of other chaperone-usher-assembled structures. In particular, FaeG is much larger than other pilins (27 versus approximately 17 kDa), grafting an additional carbohydrate binding domain on the common immunoglobulin-like core. Structural data of FaeG during different stages of the F4 fimbrial biogenesis process, combined with differential scanning calorimetry measurements, confirm the general principles of the donor strand complementation/exchange mechanisms taking place during pilus biogenesis via the chaperone-usher pathway.
Structural Biology Brussels, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.
Inge
I
Van Molle
Kristof
K
Moonens
Abel
A
Garcia-Pino
Lieven
L
Buts
Maia
M
De Kerpel
Lode
L
Wyns
Julie
J
Bouckaert
Henri
H
De Greve
D018830:Adhesins, Escherichia coli / Q000737:chemistry* / Q000378:metabolism*; D054307:Enterotoxigenic Escherichia coli / Q000737:chemistry*; D007700:Kinetics; D008958:Models, Molecular; D055503:Protein Multimerization; D020836:Protein Structure, Quaternary; D017434:Protein Structure, Tertiary; D021122:Protein Subunits / Q000737:chemistry* / Q000378:metabolism*; D013816:Thermodynamics
D018830:Adhesins, Escherichia coli; C494388:FaeG protein, E coli; D021122:Protein Subunits