Mediates the hydrolysis of steryl esters, thereby playing a central role in lipid metabolism. Under heme-deficient conditions, it constitutes the major steryl ester hydrolase, suggesting that it plays a central role in mobilization of steryl esters under anaerobic conditions. a sterol ester + H2O = a fatty acid + a sterol + H(+) Under heme-deficiency conditions. Heme-deficient induction requires ROX3. Not N-glycosylated. Present with 7770 molecules/cell in log phase SD medium. Belongs to the AB hydrolase superfamily.