1.7.1.3: nitrate reductase (NADPH)
This is an abbreviated version!
For detailed information about nitrate reductase (NADPH), go to the full flat file.
Word Map on EC 1.7.1.3
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1.7.1.3
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neurospora
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crassa
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nidulans
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molybdenum
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molybdenum-containing
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nadph-cytochrome
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molybdopterin
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positive-acting
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pathway-specific
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viologen-nitrate
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reductase-deficient
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nitrogen-related
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tungstate
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nadh:nitrate
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synthesis
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analysis
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medicine
- 1.7.1.3
- neurospora
- crassa
- nidulans
- molybdenum
-
molybdenum-containing
-
nadph-cytochrome
- molybdopterin
-
positive-acting
-
pathway-specific
-
viologen-nitrate
-
reductase-deficient
-
nitrogen-related
- tungstate
-
nadh:nitrate
- synthesis
- analysis
- medicine
Reaction
Synonyms
assimilatory NADPH-nitrate reductase, assimilatory NADPH:nitrate reductase, Assimilatory nitrate reductase, assimilatory reduced nicotinamide adenine dinucleotide phosphate-nitrate reductase, EC 1.6.6.3, EC 1.7.99.4, MSMEG_2837, NADPH-dependent nitrate reductase, NADPH-nitrate reductase, NADPH2:nitrate oxidoreductase, NADPH:nitrate reductase, NADPH:NR, NaR1, narB, nit-3, nitrate reductase, nitrate reductase (NADPH), nitrate reductase (reduced nicotinamide adenine dinucleotide phosphate), nitrate reductase [NADPH], NR, triphosphopyridine nucleotide-nitrate reductase
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Substrates Products
Substrates Products on EC 1.7.1.3 - nitrate reductase (NADPH)
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REACTION DIAGRAM
chlorate + NADPH
chlorite + NADP+
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lower affinity than to nitrate, appears to be toxic or its product
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?
ferricytochrome c + NADPH + H+
ferrocytochrome c + NADP+ + H2O
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-
-
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r
nitrate + reduced anthraquinone 2-sulfonate
nitrite + anthraquinone 2-sulfonate
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-
-
-
?
NAD(P)+ + nitrite + H2O
A0A8D3X5C3; A0A8D3X5J3
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-
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?
NAD(P)H + H+ + nitrate
NAD(P)+ + nitrite + H2O
A0A8D3X5C3; A0A8D3X5J3
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-
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?
nitrate + NADPH
nitrite + NADP+
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enzyme is essential for reduction of nitrate to ammonia, under oxic conditions the enzyme is involved in nitrate assimilation, under anoxic conditions the enzyme is used for dissimilatory nitrate reduction, transcription regulation mechanism via ammonium, nitrate, and O2 concentrations, overview
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-
?
nitrate + NADPH
nitrite + NADP+
enzyme is involved in nitrate assimilation
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-
?
nitrate + NADPH
nitrite + NADP+
enzyme is involved in nitrate assimilation, it serves the nitrogen nutrition of the host plant of Tuber borchii in symbiosis
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-
?
nitrate + NADPH
nitrite + NADP+
enzyme is involved in nitrate assimilation, it serves the nitrogen nutrition of the host plant of Tuber borchii in symbiosis
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-
?
nitrate + NADPH
nitrite + NADP+ + H2O
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some mutants use hypoxanthine as nitrogen source, 4.5-S cytochrome-c reductase activity
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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4 activities: NADPH-nitrate reductase, FADH-nitrate reductase, reduced methyl viologen-nitrate reductase and NADPH-cytochrome c reductase
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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two associated activities: cytochrome c reductase and reduced viologen dye:nitrate reductase
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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catalyzes the NADPH-linked reduction of ferricyanide and 2,6-dichlorophenolindophenol, chlorate- and bromate-dependent NADPH oxidation, and FMNH-linked nitrate reduction
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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some mutants use hypoxanthine as nitrogen source, 4.5-S cytochrome-c reductase activity
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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associated cytochrome c reductase activity
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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key enzyme in the assimilation path of nitrate to ammonium. Crude extracts possess endogenous NADPH regenerating systems capable of providing reducing equivalents for effective nitrate reduction in vitro
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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20-fold higher activity with NADPH than with NADH
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ir
nitrate + NADPH
nitrite + NADP+ + H2O
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4 activities: NADPH-nitrate reductase, FADH-nitrate reductase, reduced methyl viologen-nitrate reductase and NADPH-cytochrome c reductase
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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4 activities: NADPH-nitrate reductase, FADH-nitrate reductase, reduced methyl viologen-nitrate reductase and NADPH-cytochrome c reductase
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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4 activities: NADPH-nitrate reductase, FADH-nitrate reductase, reduced methyl viologen-nitrate reductase and NADPH-cytochrome c reductase
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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associated FAD-nitrate reductase and methylviologen-nitrate activity
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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first step in nitrate assimilation
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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key enzyme in the assimilation path of nitrate to ammonium. Crude extracts possess endogenous NADPH regenerating systems capable of providing reducing equivalents for effective nitrate reduction in vitro
-
?
nitrate + NADPH
nitrite + NADP+ + H2O
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first step in the reduction of nitrate to ammonia, biosynthesis of amino acids and other nitrogen-containing cell constituents
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?
nitrate + NADPH
nitrite + NADP+ + H2O
-
20-fold higher activity with NADPH than with NADH
-
ir
nitrate + NADPH
nitrite + NADP+ + H2O
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4 activities: NADPH-nitrate reductase, FADH-nitrate reductase, reduced methyl viologen-nitrate reductase and NADPH-cytochrome c reductase
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?
nitrate + NADPH
nitrite + NADP+ + H2O
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first step in the reduction of nitrate to ammonia, biosynthesis of amino acids and other nitrogen-containing cell constituents
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?
nitrite + oxidized methyl viologen
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-
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?
nitrate + reduced methyl viologen
nitrite + oxidized methyl viologen
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-
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?
oxidized methyl viologen + nitrite + H2O
A0A8D3X5C3; A0A8D3X5J3
the optimum electron donor is methyl viologen plus Na2S2O4
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-
?
reduced methyl viologen + nitrate
oxidized methyl viologen + nitrite + H2O
A0A8D3X5C3; A0A8D3X5J3
the optimum electron donor is methyl viologen plus Na2S2O4
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-
?
?
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enzyme expression is regulated by different inorganic and organic nitrogen sources, e.g. nitrate, ammonium, urea and glutamate, regulatory mechanism of nitrate aquisition in ectomycchorizae, overview
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?
additional information
?
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NADPH-dependent cytochrome c reducing activity by the holo-enzyme is determined with FAD and NADPH spectroscopically at 550 nm and 340 nm. Apo-nitrate reductase has a marginally lower, about 10% reduced cytochrome c reducing activity, which correlates to its 15% reduced heme content
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?