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Literature summary for 1.7.5.1 extracted from

  • Guigliarelli, B.; Asso, M.; More, C.; Augier, V.; Blasco, F.; Pommier, J.; Giordano, G.; Bertrand, P.
    EPR and redox characterization of iron-sulfur centers in nitrate reductases A and Z from Escherichia coli. Evidence for a high-potential and a low-potential class and their relevance in the electron-transfer mechanism (1992), Eur. J. Biochem., 207, 61-68.
    View publication on PubMed
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Localization

Localization Comment Organism GeneOntology No. Textmining
membrane
-
 Escherichia coli 16020
-

Metals/Ions

Metals/Ions Comment Organism Structure
Fe the four iron-sulfur centers of nitrate reductase A belong to two classes with markedly different redox potentials. The high-potential group comprises a [3Fe-4S] and a [4Fe-4S] cluster whose midpoint potentials are +60 mV and +80 mV, respectively. Although these centers are magnetically isolated, they are coupled by a significant anticooperative redox interaction of about 50 mV. The [4Fe-4S]1+ center occurs in two different conformations as shown by its composite EPR spectrum. The low-potential group contains two [4Fe-4S] clusters with more typical redox potentials (-200 mV and -400 mV). In the fully reduced state, the three [4Fe-4S]1+ centers are magnetically coupled. The iron-sulfur centers nitrate reductase Z and nitrate reductase A, exhibit essentially the same characteristics, except that the midpoint potentials of the high-potential centers of nitrate reductase Z appear negatively shifted by about 100 mV. A correspondence between the high-potential iron-sulfur clusters of the two enzymes can be proposed Escherichia coli

Organism

Organism UniProt Comment Textmining
Escherichia coli
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
 Escherichia coli

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
nitrate + reduced benzyl viologen
-
 Escherichia coli nitrite + benzyl viologen
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 ?

Synonyms

Synonyms Comment Organism
nitrate reductase A
-
 Escherichia coli
nitrate reductase Z
-
 Escherichia coli

Cofactor

Cofactor Comment Organism Structure
bis(molybdopterin guanine dinucleotide)molybdenum cofactor
-
 Escherichia coli