1.7.2.1: nitrite reductase (NO-forming)

This is an abbreviated version!
For detailed information about nitrite reductase (NO-forming), go to the full flat file.

Word Map on EC 1.7.2.1

Reaction

nitric oxide
+
H2O
+
ferricytochrome c
=
nitrite
+
ferrocytochrome c
+ 2 H+

Synonyms

AcNIR, AfNiR, AniA, AxNiR, C551-O2 oxidoreductase, cd1 nitrite reductase, cd1NiR, cNOR, copper-containing dissimilatory nitrite reductase, copper-containing nitrite reductase, Cu-NIR, Cu-NirK, CuNIR, cytochrome c-551:O2, NO2- oxidoreductase, cytochrome cd, cytochrome cd1 nitrite reductase, cytochrome oxidase, dissimilatory nitrite reductase, dissimilatory nitrite reductase cytochrome cd1, EC 1.9.3.2, GK0767, GtNiR, HdNIR, hemoglobin, HydNIR, mARC1, mARC2, mitochondrial amidoxime reducing component, NiR, NiR-Pa, NirK, NirS, nitrite reductase, oxidase, Pseudomonas cytochrome, PaNiR, PNR, Pseudomonas cytochrome oxidase, PsNiR, reductase, nitrite (cytochrome)

ECTree

     1 Oxidoreductases
         1.7 Acting on other nitrogenous compounds as donors
             1.7.2 With a cytochrome as acceptor
                1.7.2.1 nitrite reductase (NO-forming)

Specific Activity

Specific Activity on EC 1.7.2.1 - nitrite reductase (NO-forming)

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SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
0.048
-
nitrite reduction
0.33
-
electron donor azurin
2.1
-
nitrite reduction, elctron donor methyl viologen
3.32
-
reduction of N,N,N',N'-tetramethyl-4-phenyldiamine
10.8
-
recombinant enzyme, without activation, enzyme has only type 1 copper centers
22.7
-
enzyme is activated 2.5-4.5fold by freezing at -20°C for 6 h and subsequent thawing
40
-
if reduced nitrite is measured
45.2
-
native recombinant enzyme, azurin
80 - 90
-
if oxidized benzyl viologen is measured
82
-
mutant N90S, pH 7.1
107
-
native recombinant enzyme, dithionite
117
-
after storage at -20°C for 25 h and thawing in a water bath at 20°C
123
-
mutant H254F, pH 7.1
130
-
electron donor benzyl viologen
167.7
-
recombinant enzyme, after activation with CuSO4
168
-
native recombinant enzyme, methyl viologen
240
-
wild-type, pH 7.1
303
pH 6.5, 35°C
960
-
in the presence of 2 M NaCl