Streptococcal surface repeat domain - SSURE - is a protein fragment found to bind to extracellular matrix protein fibronectin but not to collagen or submaxillary mucin in Streptococci. Anti-SSURE antibodies recognised the corresponding protein on the surface of streptococcal cells. The full-length proteins are thus fibronectin-binding surface adhesins. The structure was predicted to be composed of two subdomains [1].

1: Sequence analysis and characterization of a novel fibronectin-binding repeat domain from the surface of Streptococcus pneumoniae. Bumbaca D, Littlejohn JE, Nayakanti H, Rigden DJ, Galperin MY, Jedrzejas MJ; OMICS. 2004;8:341-356. PMID:15703481

2: The Streptococcus agalactiae cell wall-anchored protein PbsP mediates adhesion to and invasion of epithelial cells by exploiting the host vitronectin/alphav integrin axis. De Gaetano GV, Pietrocola G, Romeo L, Galbo R, Lentini G, Giardina M, Biondo C, Midiri A, Mancuso G, Venza M, Venza I, Firon A, Trieu-Cuot P, Teti G, Speziale P, Beninati C; Mol Microbiol. 2018; [Epub ahead of print] PMID:30030946