Enables MHC class I protein binding activity; peptidase activity; and protein-disulfide reductase (glutathione) activity. Involved in several processes, including cellular response to nonylphenol; response to benzene; and response to ischemia. Located in several cellular components, including acrosomal vesicle; mitochondrial intermembrane space; and smooth endoplasmic reticulum. Part of TAP complex. Used to study autoimmune hepatitis and irritable bowel syndrome. Biomarker of asphyxia neonatorum; irritable bowel syndrome; liver cirrhosis; post-traumatic stress disorder; and pulmonary hypertension. Human ortholog(s) of this gene implicated in autoimmune hepatitis. Orthologous to human PDIA3 (protein disulfide isomerase family A member 3). [provided by Alliance of Genome Resources, Apr 2022]