Involved in the negative feedback regulation of pmk1 cell integrity signaling and is linked to cellular calcium signaling. Expression is under the control of atf1 and mbx1 via the putative cAMP-responsive element (CRE) sequence TTACAGTAA and the RLM1-binding sequence GTATATATAG in the promoter region. The GPI-anchor is attached to the protein in the endoplasmic reticulum and serves to target the protein to the cell surface. There, the glucosamine-inositol phospholipid moiety is cleaved off and the GPI-modified mannoprotein is covalently attached via its lipidless GPI glycan remnant to the 1,6-beta-glucan of the outer cell wall layer (By similarity). Extensively N-glycosylated. Belongs to the SPS2 family.