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Literature summary for 1.7.7.1 extracted from

  • Guerrero, M.G.; Vega, J.M.; Losada, M.
    The assimilatory nitrate-reducing system and its regulation (1981), Annu. Rev. Plant Physiol., 32, 169-204.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
CO enzyme from higher plants and algae [Chlorella] fusca
CO enzyme from higher plants and algae Cucurbita pepo
CO enzyme from higher plants and algae Neopyropia yezoensis
CO enzyme from higher plants and algae Spinacia oleracea
cyanide
-
[Chlorella] fusca
cyanide
-
Cucurbita pepo
cyanide
-
Neopyropia yezoensis
cyanide
-
Spinacia oleracea
Mersalyl
-
Cucurbita pepo
p-hydroxymercuribenzoate enzyme from higher plants and eukaryotic algae inhibited, cyanobacterial enzyme not [Chlorella] fusca
p-hydroxymercuribenzoate enzyme from higher plants and eukaryotic algae inhibited, cyanobacterial enzyme not Cucurbita pepo
p-hydroxymercuribenzoate enzyme from higher plants and eukaryotic algae inhibited, cyanobacterial enzyme not Neopyropia yezoensis
p-hydroxymercuribenzoate enzyme from higher plants and eukaryotic algae inhibited, cyanobacterial enzyme not Spinacia oleracea

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
additional information
-
Spinacia oleracea
additional information
-
additional information
-
[Chlorella] fusca
additional information
-
additional information
-
Cucurbita pepo
additional information
-
additional information
-
Neopyropia yezoensis

Localization

Localization Comment Organism GeneOntology No. Textmining
particle-bound chlorophyll-containing subcellular particle Synechococcus elongatus PCC 7942 = FACHB-805
-
-
soluble exception: Anacystis Synechococcus elongatus PCC 7942 = FACHB-805
-
-

Metals/Ions

Metals/Ions Comment Organism Structure
Iron
-
[Chlorella] fusca
Iron
-
Cucurbita pepo
Iron
-
Neopyropia yezoensis
Iron enzyme contains 1 tetranuclear center (4Fe-4S) and 1 siroheme, minimum of 5 Fe atoms per active enzyme molecule Spinacia oleracea

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
60000 63000 gel filtration, sedimentation equilibrium Spinacia oleracea
63000
-
-
Spinacia oleracea
63000
-
-
[Chlorella] fusca
63000
-
-
Cucurbita pepo
63000
-
-
Neopyropia yezoensis

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
nitrite + reduced ferredoxin Synechococcus elongatus PCC 7942 = FACHB-805
-
ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin Spinacia oleracea
-
ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin [Chlorella] fusca
-
ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin Cucurbita pepo
-
ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin Neopyropia yezoensis
-
ammonia + oxidized ferredoxin
-
?

Organism

Organism UniProt Comment Textmining
Cucurbita pepo
-
-
-
Neopyropia yezoensis
-
-
-
Spinacia oleracea
-
-
-
Synechococcus elongatus PCC 7942 = FACHB-805
-
-
-
[Chlorella] fusca
-
-
-

Reaction

Reaction Comment Organism Reaction ID
NH3 + 2 H2O + 3 oxidized ferredoxin = nitrite + 3 reduced ferredoxin + 7 H+ mechanism Synechococcus elongatus PCC 7942 = FACHB-805
NH3 + 2 H2O + 3 oxidized ferredoxin = nitrite + 3 reduced ferredoxin + 7 H+ mechanism Spinacia oleracea
NH3 + 2 H2O + 3 oxidized ferredoxin = nitrite + 3 reduced ferredoxin + 7 H+ mechanism [Chlorella] fusca
NH3 + 2 H2O + 3 oxidized ferredoxin = nitrite + 3 reduced ferredoxin + 7 H+ mechanism Cucurbita pepo
NH3 + 2 H2O + 3 oxidized ferredoxin = nitrite + 3 reduced ferredoxin + 7 H+ mechanism Neopyropia yezoensis

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
nitrite + reduced ferredoxin
-
Synechococcus elongatus PCC 7942 = FACHB-805 ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin
-
Spinacia oleracea ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin
-
[Chlorella] fusca ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin
-
Cucurbita pepo ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin
-
Neopyropia yezoensis ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donor: methyl viologen Spinacia oleracea ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donor: methyl viologen [Chlorella] fusca ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donor: methyl viologen Cucurbita pepo ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donor: methyl viologen Neopyropia yezoensis ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donors: flavodoxin Spinacia oleracea ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donors: flavodoxin [Chlorella] fusca ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donors: flavodoxin Cucurbita pepo ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin other electron donors: flavodoxin Neopyropia yezoensis ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin enzyme can also catalyze the reduction of hydroxylamine to ammonia, at lower rate Spinacia oleracea ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin enzyme can also catalyze the reduction of hydroxylamine to ammonia, at lower rate [Chlorella] fusca ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin enzyme can also catalyze the reduction of hydroxylamine to ammonia, at lower rate Cucurbita pepo ammonia + oxidized ferredoxin
-
?
nitrite + reduced ferredoxin enzyme can also catalyze the reduction of hydroxylamine to ammonia, at lower rate Neopyropia yezoensis ammonia + oxidized ferredoxin
-
?

Subunits

Subunits Comment Organism
monomer
-
Spinacia oleracea
monomer
-
[Chlorella] fusca

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
10
-
nitrite
-
Neopyropia yezoensis
54
-
nitrite
-
[Chlorella] fusca
89
-
nitrite
-
Cucurbita pepo
110
-
nitrite
-
Spinacia oleracea

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7.5
-
-
Spinacia oleracea
7.5
-
-
[Chlorella] fusca
7.5
-
-
Cucurbita pepo
7.5
-
-
Neopyropia yezoensis

Cofactor

Cofactor Comment Organism Structure
siroheme prosthetic group Spinacia oleracea
siroheme 1 mol siroheme per mol of enzyme Spinacia oleracea