1.9.6.1: nitrate reductase (cytochrome)
This is an abbreviated version!
For detailed information about nitrate reductase (cytochrome), go to the full flat file.
Word Map on EC 1.9.6.1
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1.9.6.1
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nitrite
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denitrification
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denitrify
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molybdenum
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paracoccus
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dissimilatory
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denitrificans
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n2o
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pantotrophus
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napf
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nitrate-reducing
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desulfuricans
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molybdoenzymes
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thiosphaera
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cyma
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fixk2
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menaquinol
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di-haem
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bismolybdopterin
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wolinella
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high-g
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narghi
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norcbqd
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nitrate-dependent
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mo-containing
- 1.9.6.1
- nitrite
-
denitrification
-
denitrify
- molybdenum
- paracoccus
-
dissimilatory
- denitrificans
- n2o
- pantotrophus
- napf
-
nitrate-reducing
- desulfuricans
-
molybdoenzymes
-
thiosphaera
-
cyma
- fixk2
- menaquinol
-
di-haem
-
bismolybdopterin
-
wolinella
-
high-g
- narghi
-
norcbqd
-
nitrate-dependent
-
mo-containing
Reaction
2 ferrocytochrome + 2 H+ + = 2 ferricytochrome + +
Synonyms
benzyl viologen-nitrate reductase, EC 1.7.99.4, mmol_1648, More, NAP, NAP enzyme, Nap-alpha, NAP-beta, NapA, napA-beta, NapAB, NapABC, NapDAGHB, NapEDABC, nitrate reductase, periplasmic, periplasmic nitrate reductase, periplasmic nitrate reductases, reductase, nitrate (cytochrome), respiratory nitrate reductase, single subunit Nap-type periplasmic nitrate reductase
ECTree
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Metals Ions
Metals Ions on EC 1.9.6.1 - nitrate reductase (cytochrome)
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Fe
Fe2+
Iron
Mo
Mo(VI)
Mo5+
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NapA contains a molybdo-bis(molybdopterin guanine dinucleotide) cofactor. The molybdenum ion coordination sphere of NapA includes two molybdopterin guanine dinucleotide dithiolenes, a protein-derived cysteinyl ligand and an oxygen atom. The Mo-O bond length is 2.6 A, which is indicative of a water ligand. In NapA or NapAB, the Mo5+ state can not be further reduced to Mo4+. A catalytic cycle for NapA is proposed in which nitrate binds to the Mo5+ ion and where a stable des-oxo Mo6+ species may participate
Mo6+
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NapA contains a molybdo-bis(molybdopterin guanine dinucleotide) cofactor. The molybdenum ion coordination sphere of NapA includes two molybdopterin guanine dinucleotide dithiolenes, a protein-derived cysteinyl ligand and an oxygen atom. The Mo-O bond length is 2.6 A, which is indicative of a water ligand. In NapA or NapAB, the Mo5+ state can not be further reduced to Mo4+. A catalytic cycle for NapA is proposed in which nitrate binds to the Mo5+ ion and where a stable des-oxo Mo6+ species may participate
Molybdenum
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subunit NapA is an 90000 Da catalytic subunit which binds a bis-molybdenum guanosine dinucleoside cofactor and a [4Fe4S] cluster
Fe
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contains 2.7 mol iron (of which 1.4 mol is presumably non-haem iron) per mol of protein (assuming a 110000 Da molecular mass)
Iron
Fe:Mo ratio is slightly higher than the theoretical value of 4:1
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subunit NapA is an 90000 Da catalytic subunit which binds a bis-molybdenum guanosine dinucleoside cofactor and a [4Fe4S] cluster
Mo
-
contains molybdenum, 0.9 mol molybdenum: 1 mol protein (assuminga 110000 Da molecular mass)
Mo(VI)
coordinates a cysteine and a sulfido residue
92% Mo incorporation in active CNapA. The Fe:Mo ratio is slightly higher than the theoretical value of 4:1
Molybdenum
within the molybdenum cofactor. The coordination sphere of the Mo ion consists of the four thiolate ligands of two pyranopterins, a sulfur atom from a cysteine that attaches the MoCo to the protein backbone, and a sixth inorganic ligand, proposed to be oxygen or more recently sulfur
Molybdenum
O88111; O88160
the active site is a Mo bis-(pyranopterin guanine dinucleotide), relative metal content is around 1 Mo atom to 6 Fe atoms
Molybdenum
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molybdenum-containing enzyme, the nitrate molecule binds to the active site with the molabdenum ion in the +6 oxidation state, electron transfer to the active site occurs only in the proton-electron transfer stage, where the molybdenum-V species plays an important role in catalysis
Molybdenum
in the molybdenum cofactor. Role for NapD in the insertion of the molybdenum cofactor