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Literature summary for 1.8.1.2 extracted from

  • Siegel, L.M.; Davis, P.S.; Kamin, H.
    Reduced nicotinamide adenine dinucleotide phosphate-sulfite reductase of enterobacteria. 3. The Escherichia coli hemoflavoprotein: catalytic parameters and the sequence of electron flow (1974), J. Biol. Chem., 249, 1572-1586.
    View publication on PubMed

Inhibitors

Inhibitors Comment Organism Structure
arsenite
-
Escherichia coli
Br-
-
Escherichia coli
Cl-
-
Escherichia coli
CN-
-
Escherichia coli
CO
-
Escherichia coli
F-
-
Escherichia coli
NADP+ NADPH-dependent activities Escherichia coli
NO3-
-
Escherichia coli
p-Mercuriphenylsulfonate
-
Escherichia coli
SCN-
-
Escherichia coli
sulfate
-
Escherichia coli

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.0043 0.0074 sulfite
-
Escherichia coli
0.8 1.5 nitrite
-
Escherichia coli
4.5 10.5 hydroxylamine
-
Escherichia coli

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
sulfite + NADPH + H+ Escherichia coli no physiological nitrite reductase sulfide + NADP+ + H2O
-
?

Organism

Organism UniProt Comment Textmining
Escherichia coli
-
-
-

Reaction

Reaction Comment Organism Reaction ID
hydrogen sulfide + 3 NADP+ + 3 H2O = sulfite + 3 NADPH + 3 H+ mechanism of electron transfer Escherichia coli

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
hydroxylamine + NADPH NADPH can be replaced by reduced methyl viologen Escherichia coli ammonia + NADP+
-
?
additional information transfer of hydrogen from NADPH to 3-acetylpyridineadenine dinucleotide phosphate Escherichia coli ?
-
?
additional information reactions catalyzed by flavoprotein subunit alone: transfer of electrons from NADPH to cytochrome c, ferricyanide, dichlorphenolindophenol, menadione, FMN, FAD, O2 Escherichia coli ?
-
?
NADP+ + reduced methyl viologen
-
Escherichia coli NADPH + oxidized methyl viologen
-
?
nitrite + NADPH
-
Escherichia coli ammonia + NADP+
-
?
sulfite + NADPH NADPH can be replaced by reduced methyl viologen Escherichia coli sulfide + NADP+ + H2O
-
?
sulfite + NADPH + H+ no physiological nitrite reductase Escherichia coli sulfide + NADP+ + H2O
-
?

Turnover Number [1/s]

Turnover Number Minimum [1/s] Turnover Number Maximum [1/s] Substrate Comment Organism Structure
1.25
-
NADPH cosubstrate O2 Escherichia coli
30 40 sulfite cosubstrate NADPH Escherichia coli
43.3 51.7 nitrite cosubstrate NADPH Escherichia coli
65
-
sulfite cosubstrate reduced methyl viologen Escherichia coli
98.3 217 hydroxylamine cosubstrate NADPH Escherichia coli
158
-
NADPH cosubstrate 3-acetylpyridineadenine dinucleotide phosphate Escherichia coli
172
-
NADPH cosubstrate FMN Escherichia coli
318
-
NADPH cosubstrate cytochrome c Escherichia coli
462
-
NADPH cosubstrate dichlorphenolindophenol Escherichia coli
468
-
NADPH cosubstrate ferricyanide Escherichia coli
605
-
NADP+
-
Escherichia coli
605
-
reduced methyl viologen
-
Escherichia coli

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7.9
-
sulfite Escherichia coli
8.6
-
nitrite Escherichia coli
9.5
-
hydroxylamine Escherichia coli

Cofactor

Cofactor Comment Organism Structure
flavin treatment with p-chloromercuriphenylsulfonate causes dissociation of FMN but retetion of FAD and heme Escherichia coli