The crystal structure of the monocupin 5-nitrosalicylate 1,2-dioxygenase, an iron(II)-dependent ring-cleaving dioxygenase, fromBradyrhizobiumsp. was determined by molecular replacement using a theoretical model obtained byAlphaFold2. Comparison with structures of other members of the same class and docking of the substrate allowed identification of the residues responsible for its very unusual enzyme selectivity.