Mediates binding to human platelets, possibly through a receptor-ligand interaction. Probably associated with virulence in endovascular infection (By similarity). Interacts with host (human) gp-340 via the non-repeat region (NRR or binding region). Binding is inhibited by N-acetylneuraminic acid (NeuAc) (PubMed:23439307). Interacts with human gp-340 (DMBT1). Exported by the accessory SecA2/SecY2 system. Anchored to the cell wall by sortase A (By similarity). The non-repeat region (NRR, also called binding region, BR) binds to human gp-340; binding is prevented by N-acetylneuraminic acid (NeuAc). 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). Significantly decreased binding to human saliva- and gp340-coated resins (DMBT1). Belongs to the serine-rich repeat protein (SRRP) family.