Probable structural component of the cell wall involved in cell wall integrity and virulence. Expression is induced by host macrophages. O-glycosylated. Extensively O-mannosylated. Leads to increased chitin content in the cell wall, hyperfilamentation, and resistance to sodium dodecyl sulfate, hydrogen peroxide, and sodium chloride. Shows also an increased virulence in a mouse model. Belongs to the PIR protein family.