Enables NADP binding activity and steroid binding activity. Involved in several processes, including cellular response to estradiol stimulus; glucocorticoid metabolic process; and regulation of pentose-phosphate shunt. Located in apical part of cell; nuclear membrane; and rough endoplasmic reticulum. Used to study obesity. Biomarker of familial hyperlipidemia; status epilepticus; and type 2 diabetes mellitus. Human ortholog(s) of this gene implicated in cortisone reductase deficiency and cortisone reductase deficiency 2. Orthologous to human HSD11B1 (hydroxysteroid 11-beta dehydrogenase 1). [provided by Alliance of Genome Resources, Apr 2022]