Asp1, along with SecY2, SecA2, and other proteins forms part of the accessory secretory protein system. The system is involved in the export of serine-rich glycoproteins important for virulence in a number of Gram-positive species, including Streptococcus gordonii and Staphylococcus aureus. This protein family is assigned to transport rather than glycosylation function, but the specific molecular role is unknown [1]. Asp1 is predicted to be cytosolic [2].

1: A unique serine-rich repeat protein (Srr-2) and novel surface antigen (epsilon) associated with a virulent lineage of serotype III Streptococcus agalactiae. Seifert KN, Adderson EE, Whiting AA, Bohnsack JF, Crowley PJ, Brady LJ; Microbiology. 2006;152:1029-1040. PMID:16549667

2: Emerging themes in SecA2-mediated protein export. Feltcher ME, Braunstein M; Nat Rev Microbiol. 2012;10:779-789. PMID:23000954