Cytoplasmic class E vacuolar protein sorting (VPS) factor; coordinates protein sorting and deubiquitination in the multivesicular body (MVB) pathway by recruiting Doa4p to endosomes; required for ESCRT-dependent transport of ubiquitinated cargo to the vacuole; localizes to extracellular vesicles during heat conditioning with proposed function in thermotolerance; orthologous to mammalian ESCRT-associated protein ALIX (PDCD6IP)