Enables sterol O-acyltransferase activity. Predicted to be involved in several processes, including cholesterol efflux; cholesterol esterification; and macrophage derived foam cell differentiation. Predicted to be located in endoplasmic reticulum and membrane. Predicted to be active in endoplasmic reticulum membrane. Human ortholog(s) of this gene implicated in Chagas disease. Orthologous to human SOAT1 (sterol O-acyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]