Protein required for nuclear envelope integrity; involved in distribution of nuclear pore complexes; interacts with Ulp1p, a Ubl (ubiquitin-like protein)-specific protease for Smt3p protein conjugates; involved in lipid homeostasis; localizes to the ER and nuclear envelope, and in a phosphorylated state in the mitochondrial outer membrane; expression induced upon stationary phase entry and under nutrient-limited conditions; nuclear envelope defects are complemented by expression of human TOR1A