| ferredoxin—nitrite reductase | |
| Ec Number: | 1.7.7.1 |
| Cas Number: | 37256-44-3 |
| Go Code: | 0048307 |
In enzymology, a ferredoxin—nitrite reductase is an enzyme that catalyzes the chemical reaction
\rightleftharpoons
The 3 substrates of this enzyme are NH3, H2O, and oxidized ferredoxin, whereas its 3 products are nitrite, reduced ferredoxin, and H+.
This enzyme belongs to the family of oxidoreductases, specifically those acting on other nitrogenous compounds as donors with an iron-sulfur protein as acceptor. The systematic name of this enzyme class is ammonia:ferredoxin oxidoreductase. This enzyme participates in nitrogen metabolism and nitrogen assimilation. It has 3 cofactors: iron, Siroheme, and Iron-sulfur.
This enzyme can use many different isoforms of ferredoxin. In photosynthesizing tissues, it uses ferredoxin that is reduced by PSI and in the root it uses a form of ferredoxin (FdIII) that has a less negative midpoint potential and can be reduced easily by NADPH.[1]
As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes,, and .