Probable cell wall protein required for filamentation at low pH. Expressed under acidic conditions. Expression is positively regulated by HAP43 and NRG1, and repressed by RIM101. Expression is also controlled by SUR7. 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).