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Literature summary for 1.7.1.4 extracted from

  • Wang, R.; Nicholas, D.J.D.
    Some properties of nitrite and hydroxylamine reductases from Derxia gummosa (1986), Phytochemistry, 25, 2463-2469.
No PubMed abstract available

Inhibitors

Inhibitors Comment Organism Structure
1-cyclohexyl-3-(2-morpholinoethyl)-carbodiimide metho-p-toluenesulfonate preincubation with NO2- completely protects Derxia gummosa
2,2'-bipyridine 1 mM, 40% inhibition, no inhibition if enzyme is preincubated with nitrite or NH2OH prior to adding the inhibitor Derxia gummosa
8-hydroxyquinoline 1 mM, 96% inhibition Derxia gummosa
antimycin A 0.2 mM, 45% inhibition Derxia gummosa
CN- 1 mM, 45% inhibition, no inhibition if enzyme is preincubated with nitrite or NH2OH prior to adding the inhibitor Derxia gummosa
dinitrophenol
-
Derxia gummosa
hydroxylamine competitive vs. nitrite Derxia gummosa
Iodine
-
Derxia gummosa
KCNS 0.1 mM, 90% inhibition of NH2OH reductase activity, nitrite reductase activity is not affected Derxia gummosa
N-ethylmaleimide 0.1 mM, 52% inhibition Derxia gummosa
NH2OH competitive vs. NO2- Derxia gummosa
nitrite competitive vs. hydroxylamine Derxia gummosa
p-chloromercuribenzoate 0.1 mM, 60% inhibition Derxia gummosa
Rose bengal preincubation with NO2- completely protects Derxia gummosa
rotenone 0.1 mM, 56% inhibition Derxia gummosa

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.0048
-
NO2-
-
Derxia gummosa
0.0063
-
NADH + NO2- Derxia gummosa
0.15
-
NADH + hydroxylamine Derxia gummosa
5.3
-
hydroxylamine
-
Derxia gummosa

Organism

Organism UniProt Comment Textmining
Derxia gummosa
-
-
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
0.422
-
reduction of NO2- Derxia gummosa
0.868
-
reduction of hydroxylamine Derxia gummosa

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
NAD(P)H + NH2OH
-
Derxia gummosa NAD(P)+ + NH3 + H2O
-
?
NAD(P)H + nitrite + H+ NADH is preferred, reduced benzyl viologen or methyl viologen can act as artificial electron donors Derxia gummosa NAD(P)+ + NH3 + H2O
-
?
nitrite + NADH + H+
-
Derxia gummosa NH3 + NAD+ + H2O
-
r

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
8.5
-
-
Derxia gummosa

Cofactor

Cofactor Comment Organism Structure
NADH
-
Derxia gummosa
NADPH
-
Derxia gummosa

Ki Value [mM]

Ki Value [mM] Ki Value maximum [mM] Inhibitor Comment Organism Structure
0.52
-
NO2-
-
Derxia gummosa
24
-
NH2OH
-
Derxia gummosa