Enables oxysterol 7-alpha-hydroxylase activity and steroid 7-alpha-hydroxylase activity. Involved in bile acid biosynthetic process. Acts upstream of or within cholesterol catabolic process. Predicted to be located in intracellular membrane-bounded organelle. Is expressed in several structures, including alimentary system; brain; genitourinary system; respiratory system; and sensory organ. Orthologous to human CYP39A1 (cytochrome P450 family 39 subfamily A member 1). [provided by Alliance of Genome Resources, Apr 2022]