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5-nitrosalicylate dioxygenase

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:

(1a) 5-nitrosalicylic acid + O<sub>2</sub> 4-nitro-6-oxohepta-2,4-dienedioate
(1b) 4-nitro-6-oxohepta-2,4-dienedioate 2-oxo-3-(5-oxofuran-2-ylidene)propanoic acid + nitrite (spontaneous reaction)

The enzyme from soil bacterium Bradyrhizobium sp. JS329 participates in 5-nitroanthranilate degradation.

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