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Nitrite dismutase (EC 1.7.6.1, Prolixin S, Nitrophorin 7) is an enzyme with systematic name nitrite:nitrite oxidoreductase.^[1]^[2] This enzyme catalyses the following chemical reaction

3 nitrite + 2 H⁺

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Nitrite dismutase contains ferriheme b.

References

^ He C, Knipp M (September 2009). "Formation of nitric oxide from nitrite by the ferriheme b protein nitrophorin 7". Journal of the American Chemical Society. 131 (34): 12042–3. doi:10.1021/ja9040362. PMID 19655755.
^ He C, Ogata H, Knipp M (July 2010). "Formation of the complex of nitrite with the ferriheme b beta-barrel proteins nitrophorin 4 and nitrophorin 7". Biochemistry. 49 (28): 5841–51. doi:10.1021/bi100324z. PMID 20524697.

Nitrite+dismutase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Oxidoreductases: nitrogenous donor (EC 1.7)
1.7.1	GMP reductase
1.7.2	Nitrite reductase (NO-forming)
1.7.3	Urate oxidase
1.7.7	Ferredoxin—nitrite reductase
1.7.99	Hydroxylamine reductase

Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)