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Literature summary extracted from

  • Mortenson, L.E.; Thorneley, R.N.F.
    Structure and function of nitrogenase (1979), Annu. Rev. Biochem., 48, 387-418.
    View publication on PubMed

Inhibitors

EC Number Inhibitors Comment Organism Structure
1.18.6.1 C2H2 noncompetitive inhibitor of N2 reduction Azotobacter chroococcum
1.18.6.1 C2H2 noncompetitive inhibitor of N2 reduction Azotobacter vinelandii
1.18.6.1 C2H2 noncompetitive inhibitor of N2 reduction Clostridium pasteurianum
1.18.6.1 C2H2 noncompetitive inhibitor of N2 reduction Klebsiella pneumoniae
1.18.6.1 C2H2 noncompetitive inhibitor of N2 reduction Paenibacillus polymyxa
1.18.6.1 CO noncompetitive inhibitor of N2, C2H2 and N3- reduction, no inhibition of H+ reduction Azotobacter chroococcum
1.18.6.1 CO noncompetitive inhibitor of N2, C2H2 and N3- reduction, no inhibition of H+ reduction Azotobacter vinelandii
1.18.6.1 CO noncompetitive inhibitor of N2, C2H2 and N3- reduction, no inhibition of H+ reduction Clostridium pasteurianum
1.18.6.1 CO noncompetitive inhibitor of N2, C2H2 and N3- reduction, no inhibition of H+ reduction Klebsiella pneumoniae
1.18.6.1 CO noncompetitive inhibitor of N2, C2H2 and N3- reduction, no inhibition of H+ reduction Paenibacillus polymyxa
1.18.6.1 H2 competitive inhibitor of N2, no inhibition of N3-, C2H2, CN- or H+ reduction Azotobacter chroococcum
1.18.6.1 H2 competitive inhibitor of N2, no inhibition of N3-, C2H2, CN- or H+ reduction Azotobacter vinelandii
1.18.6.1 H2 competitive inhibitor of N2, no inhibition of N3-, C2H2, CN- or H+ reduction Clostridium pasteurianum
1.18.6.1 H2
-
Klebsiella pneumoniae
1.18.6.1 H2
-
Paenibacillus polymyxa
1.18.6.1 MgADP
-
Azotobacter chroococcum
1.18.6.1 MgADP
-
Azotobacter vinelandii
1.18.6.1 MgADP
-
Clostridium pasteurianum
1.18.6.1 MgADP
-
Klebsiella pneumoniae
1.18.6.1 MgADP
-
Paenibacillus polymyxa

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
1.18.6.1 Iron
-
Klebsiella pneumoniae
1.18.6.1 Iron
-
Clostridium pasteurianum
1.18.6.1 Iron
-
Azotobacter vinelandii
1.18.6.1 Iron
-
Paenibacillus polymyxa
1.18.6.1 Iron
-
Azotobacter chroococcum
1.18.6.1 Mg2+ Mg2+ required for MgATP complex Klebsiella pneumoniae
1.18.6.1 Mg2+ Mg2+ required for MgATP complex Clostridium pasteurianum
1.18.6.1 Mg2+ Mg2+ required for MgATP complex Azotobacter vinelandii
1.18.6.1 Mg2+ Mg2+ required for MgATP complex Paenibacillus polymyxa
1.18.6.1 Mg2+ Mg2+ required for MgATP complex Azotobacter chroococcum
1.18.6.1 Molybdenum 1-2 gatom per mol of MoFe protein , overview Klebsiella pneumoniae
1.18.6.1 Molybdenum 1-2 gatom per mol of MoFe protein , overview Clostridium pasteurianum
1.18.6.1 Molybdenum 1-2 gatom per mol of MoFe protein , overview Azotobacter vinelandii
1.18.6.1 Molybdenum 1-2 gatom per mol of MoFe protein , overview Paenibacillus polymyxa
1.18.6.1 Molybdenum 1-2 gatom per mol of MoFe protein , overview Azotobacter chroococcum

Molecular Weight [Da]

EC Number Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
1.18.6.1 additional information
-
-
Klebsiella pneumoniae
1.18.6.1 additional information
-
-
Clostridium pasteurianum
1.18.6.1 additional information
-
-
Azotobacter vinelandii
1.18.6.1 additional information
-
-
Paenibacillus polymyxa
1.18.6.1 additional information
-
-
Azotobacter chroococcum

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O Klebsiella pneumoniae
-
8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O Clostridium pasteurianum
-
8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O Azotobacter vinelandii
-
8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O Paenibacillus polymyxa
-
8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O Azotobacter chroococcum
-
8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?

Organism

EC Number Organism UniProt Comment Textmining
1.18.6.1 Azotobacter chroococcum
-
-
-
1.18.6.1 Azotobacter vinelandii
-
-
-
1.18.6.1 Clostridium pasteurianum
-
-
-
1.18.6.1 Klebsiella pneumoniae
-
-
-
1.18.6.1 Paenibacillus polymyxa
-
-
-

Reaction

EC Number Reaction Comment Organism Reaction ID
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate catalytic mechanism Klebsiella pneumoniae
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate catalytic mechanism Clostridium pasteurianum
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate catalytic mechanism Azotobacter vinelandii
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate catalytic mechanism Paenibacillus polymyxa
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate catalytic mechanism Azotobacter chroococcum
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate enzyme is composed of 2 metalloproteins: component I MoFe protein and component II Fe protein Klebsiella pneumoniae
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate enzyme is composed of 2 metalloproteins: component I MoFe protein and component II Fe protein Clostridium pasteurianum
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate enzyme is composed of 2 metalloproteins: component I MoFe protein and component II Fe protein Azotobacter vinelandii
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate enzyme is composed of 2 metalloproteins: component I MoFe protein and component II Fe protein Paenibacillus polymyxa
1.18.6.1 4 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O = 4 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate enzyme is composed of 2 metalloproteins: component I MoFe protein and component II Fe protein Azotobacter chroococcum

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1.18.6.1 2 reduced ferredoxin + 2 H+ + acetylene + 2 ATP + 2 H2O
-
Klebsiella pneumoniae 2 oxidized ferredoxin + ethylene + 2 ADP + 2 phosphate
-
?
1.18.6.1 2 reduced ferredoxin + 2 H+ + acetylene + 2 ATP + 2 H2O
-
Clostridium pasteurianum 2 oxidized ferredoxin + ethylene + 2 ADP + 2 phosphate
-
?
1.18.6.1 2 reduced ferredoxin + 2 H+ + acetylene + 2 ATP + 2 H2O
-
Azotobacter vinelandii 2 oxidized ferredoxin + ethylene + 2 ADP + 2 phosphate
-
?
1.18.6.1 2 reduced ferredoxin + 2 H+ + acetylene + 2 ATP + 2 H2O
-
Paenibacillus polymyxa 2 oxidized ferredoxin + ethylene + 2 ADP + 2 phosphate
-
?
1.18.6.1 2 reduced ferredoxin + 2 H+ + acetylene + 2 ATP + 2 H2O
-
Azotobacter chroococcum 2 oxidized ferredoxin + ethylene + 2 ADP + 2 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O
-
Klebsiella pneumoniae 8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O
-
Clostridium pasteurianum 8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O
-
Azotobacter vinelandii 8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O
-
Paenibacillus polymyxa 8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 8 reduced ferredoxin + 8 H+ + N2 + 16 ATP + 16 H2O
-
Azotobacter chroococcum 8 oxidized ferredoxin + H2 + 2 NH3 + 16 ADP + 16 phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + ATP in absence of other acceptors Klebsiella pneumoniae oxidized ferredoxin + H2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + ATP in absence of other acceptors Clostridium pasteurianum oxidized ferredoxin + H2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + ATP in absence of other acceptors Azotobacter vinelandii oxidized ferredoxin + H2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + ATP in absence of other acceptors Paenibacillus polymyxa oxidized ferredoxin + H2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + ATP in absence of other acceptors Azotobacter chroococcum oxidized ferredoxin + H2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + CN- + ATP
-
Klebsiella pneumoniae oxidized ferredoxin + CH4 + NH3 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + CN- + ATP
-
Clostridium pasteurianum oxidized ferredoxin + CH4 + NH3 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + CN- + ATP
-
Azotobacter vinelandii oxidized ferredoxin + CH4 + NH3 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + CN- + ATP
-
Paenibacillus polymyxa oxidized ferredoxin + CH4 + NH3 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + CN- + ATP
-
Azotobacter chroococcum oxidized ferredoxin + CH4 + NH3 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N2O + ATP
-
Klebsiella pneumoniae oxidized ferredoxin + H2O + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N2O + ATP
-
Clostridium pasteurianum oxidized ferredoxin + H2O + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N2O + ATP
-
Azotobacter vinelandii oxidized ferredoxin + H2O + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N2O + ATP
-
Paenibacillus polymyxa oxidized ferredoxin + H2O + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N2O + ATP
-
Azotobacter chroococcum oxidized ferredoxin + H2O + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N3- + ATP
-
Klebsiella pneumoniae oxidized ferredoxin + NH3 + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N3- + ATP
-
Clostridium pasteurianum oxidized ferredoxin + NH3 + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N3- + ATP
-
Azotobacter vinelandii oxidized ferredoxin + NH3 + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N3- + ATP
-
Paenibacillus polymyxa oxidized ferredoxin + NH3 + N2 + ADP + phosphate
-
?
1.18.6.1 reduced ferredoxin + H+ + N3- + ATP
-
Azotobacter chroococcum oxidized ferredoxin + NH3 + N2 + ADP + phosphate
-
?

Subunits

EC Number Subunits Comment Organism
1.18.6.1 dimer
-
Klebsiella pneumoniae
1.18.6.1 dimer
-
Clostridium pasteurianum
1.18.6.1 dimer
-
Azotobacter vinelandii
1.18.6.1 dimer
-
Paenibacillus polymyxa
1.18.6.1 dimer
-
Azotobacter chroococcum
1.18.6.1 More alpha-beta-monomer of the FeMo protein consists of the FeMo cofactor FeMo-co with the substrate reduction site and the [4Fe-4S] cluster Azotobacter vinelandii
1.18.6.1 tetramer
-
Klebsiella pneumoniae
1.18.6.1 tetramer
-
Clostridium pasteurianum
1.18.6.1 tetramer
-
Azotobacter vinelandii
1.18.6.1 tetramer
-
Paenibacillus polymyxa
1.18.6.1 tetramer
-
Azotobacter chroococcum