Putative adhesion protein. May be involved in cell-cell interaction, interacting with other proteins by salt bridges and hydrogen bonds. Identified as covalently-linked GPI-modified cell wall protein (GPI-CWP) in the outer cell wall layer. 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.