5DCQ

Crystal structure of bacterial adhesin, FNE from Streptococcus equi spp. equi.

Summary for 5DCQ

• Entry DOI: 10.2210/pdb5dcq/pdb
• Related: 4PFG
• Descriptor: artificial repeat proteins (alphaREP3), Fibronectin-binding protein, FORMIC ACID, ... (4 entities in total)
• Functional Keywords: adhesin, artificial repeat proteins, complex, extracellular matrix, pilus, thioester bond, structural protein
• Biological source: synthetic construct; More
• Total number of polymer chains: 6
• Total formula weight: 148680.45

Authors

Tiouajni, M.,Graille, M.,van Tilbeurgh, H. (deposition date: 2015-08-24, release date: 2016-06-29, Last modification date: 2024-01-10)

Primary citation

Tiouajni, M.,Durand, D.,Blondeau, K.,Graille, M.,Urvoas, A.,Valerio-Lepiniec, M.,Guellouz, A.,Aumont-Nicaise, M.,Minard, P.,van Tilbeurgh, H.
Structural and functional analysis of the fibronectin-binding protein FNE from Streptococcus equi spp. equi.
FEBS J., 281:5513-5531, 2014

PubMed Abstract: Streptococcus equi is a horse pathogen belonging to Lancefield group C. Infection by S. equi ssp. equi causes strangles, a serious and highly contagious disease of the upper respiratory tract. S. equi ssp. equi secretes a fibronectin (Fn)-binding protein, FNE, that does not contain cell wall-anchoring motifs. FNE binds to the gelatin-binding domain (GBD) of Fn, composed of the motifs (6) FI (12) FII (789) FI . FNE lacks the canonical Fn-binding peptide repeats observed in many microbial surface components recognizing adhesive matrix molecules. We found that the interaction between FNE and the human GBD is mediated by the binding of the disordered C-terminal region (residues 208-262) of FNE to the (789) FI GBD subfragment. The crystal structure of FNE showed that it is similar to the minor pilus protein Spy0125 of Streptococcus pyogenes, found at the end of pilus polymers and responsible for adhesion. FNE and Spy0125 both have a superimposable internal thioester bond between highly conserved Cys and Gln residues. Small-angle X-ray scattering of the FNE-(789) FI complex provided a model that aligns the C-terminal peptide of FNE with the E-strands of the FI domains, adopting the β-zipper extension model observed in previous structures of microbial surface components recognizing adhesive matrix molecule adhesion peptides bound to FI domains.

PubMed: 25290767
DOI: 10.1111/febs.13092

Experimental method

X-RAY DIFFRACTION (1.83 Å)