Mediates binding to human platelets, possibly through a receptor-ligand interaction. Probably associated with virulence in endovascular infection (By similarity). Exported by the accessory SecA2/SecY2 system. Anchored to the cell wall by sortase A (By similarity). Proteolytically cleaved by a metalloprotease. Glycosylated (By similarity). It is probable that most of the Ser residues in SSR1 and SSR2 are O-GlcNAcylated. Sequential glycosylation by sugar transferases are able to generate complex sugar polymorphisms (By similarity). Belongs to the serine-rich repeat protein (SRRP) family.