Compartment-specific sequestrase chaperone; small hsp that sequesters proteins at intranuclear quality control sites (INQs); sumoylated form promotes protein clearance from INQs during recovery from genotoxic stress; v-SNARE binding protein that mediates late endosome-Golgi protein sorting; modulates arginine uptake and pH homeostasis between the vacuole and plasma membrane H(+)-ATPase; role in prion curing; expression after severe ethanol stress is involved in clearance of denatured proteins