Cell wall protein that plays a role in adaptation and resistance to cell wall stress. Covalently-linked GPI-modified cell wall protein (GPI-CWP). Induced by transcription factors MSN2 and MSN4 in stationary phase and by transcription factors MSN2, MSN4 and HAA1 upon weak-acid stress. Up-regulated by low pH. 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. Belongs to the SED1 family.