Predicted to enable sphingolipid delta-4 desaturase activity. Predicted to be involved in ceramide biosynthetic process and sphinganine metabolic process. Predicted to act upstream of or within sphingolipid biosynthetic process. Predicted to be located in endoplasmic reticulum membrane. Orthologous to human DEGS2 (delta 4-desaturase, sphingolipid 2).