Enables identical protein binding activity. Predicted to be involved in post-translational protein modification and protein oxidation. Located in endoplasmic reticulum. Is expressed in several structures, including brain; brown fat; eye; genitourinary system; and gut. Used to study mucosulfatidosis. Human ortholog(s) of this gene implicated in mucosulfatidosis. Orthologous to human SUMF1 (sulfatase modifying factor 1). [provided by Alliance of Genome Resources, Apr 2022]