5-nitrosalicylate dioxygenase (, naaB (gene)) is an enzyme with systematic name 5-nitrosalicylate:oxygen 1,2-oxidoreductase (decyclizing). This enzyme catalyses the following overall chemical reaction
The two steps are:
The enzyme from soil bacterium Bradyrhizobium sp. JS329 participates in 5-nitroanthranilate degradation.