Seems to have esterase activity. Prefers ester of fatty acids from 4 to 16 carbon atoms. Covalently-linked GPI-modified cell wall protein (GPI-CWP) found only in mother cells. Induced during anaerobic growth and by cold shock and heat shock. Extensively O-glycosylated. 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. Present with 35600 molecules/cell in log phase SD medium. Belongs to the SRP1/TIP1 family.