Part of the accessory SecA2/SecY2 system specifically required to export GspB, a serine-rich repeat cell wall protein encoded upstream in the same operon. Part of the accessory SecA2/SecY2 protein translocation apparatus required to export cell wall protein GspB. Alters carbohydrate composition of cell wall protein GspB, about 20% reduction in platelet binding by whole cells. Belongs to the glycosyltransferase 8 family.