ER-resident glycoprotein involved in high-pressure tolerance; proposed role promoting proper folding of nutrient permeases, such as Tat2p, in the ER during hydrostatic pressure stress and maintaining permease conformational stability; contains two transmembrane domains, a C-terminal cytoplasmic domain and a luminal region with 12 N-linked glycans; null is synthetically sick with cdc13-1; localizes to the ER membrane