enzymology, a ferredoxin—nitrite reductase ( EC 18.104.22.168) is an enzyme that catalyzes the chemical reaction
3 + 2 H 2O + 6 oxidized ferredoxin nitrite + 6 reduced ferredoxin + 7 H +
substrates of this enzyme are NH, 3 H, and 2O 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 negetive midpoint potential and can be reduced easily by NADPH. [1 ]
Structural studies [ edit ]
As of late 2007, 3
structures have been solved for this class of enzymes, with PDB accession codes 1ZJ8, 1ZJ9, and 2AKJ.
References [ edit ]