Enables glutathione dehydrogenase (ascorbate) activity. Involved in L-ascorbic acid biosynthetic process. Located in several cellular components, including cell body; myelin sheath; and nuclear membrane. Human ortholog(s) of this gene implicated in Alzheimer's disease and Parkinson's disease. Orthologous to human GSTO1 (glutathione S-transferase omega 1). [provided by Alliance of Genome Resources, Apr 2022]