Glutathione Organic Nitrate Ester Reductase:
A transferase that catalyzes the addition of aliphatic, aromatic, or heterocyclic radicals as well as epoxides and arene oxides to glutathione. Addition takes place at the sulfur atom. It also catalyzes the reduction of polyol nitrate by glutathione to polyol and nitrite. EC 2.5.1.18.