Enables 6-phosphogluconolactonase activity and glucose-6-phosphate dehydrogenase activity. Involved in regulation of cortisol biosynthetic process. Acts upstream of or within pentose-phosphate shunt. Located in sarcoplasmic reticulum. Is expressed in alimentary system; cranium; facial bone primordium; liver; and tooth. Human ortholog(s) of this gene implicated in cortisone reductase deficiency; cortisone reductase deficiency 1; and multiple sclerosis. Orthologous to human H6PD (hexose-6-phosphate dehydrogenase/glucose 1-dehydrogenase). [provided by Alliance of Genome Resources, Apr 2022]