1.7.5.1: nitrate reductase (quinone)
This is an abbreviated version!
For detailed information about nitrate reductase (quinone), go to the full flat file.
Word Map on EC 1.7.5.1
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1.7.5.1
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denitrification
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denitrify
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quinols
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dissimilatory
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chlorate
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narj
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narghji
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molybdoenzyme
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nitrate-reducing
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menaquinol
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nitrate-dependent
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q-site
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stigmatellin
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menasemiquinone
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hyscore
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menadiol
- 1.7.5.1
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denitrification
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denitrify
- quinols
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dissimilatory
- chlorate
- narj
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narghji
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molybdoenzyme
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nitrate-reducing
- menaquinol
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nitrate-dependent
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q-site
- stigmatellin
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menasemiquinone
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hyscore
- menadiol
Reaction
Synonyms
EC 1.7.99.4, gene narH, membrane-bound nitrate reductase, membrane-bound quinol:nitrate oxidoreductase, MSMEG_5140, NaR, NaR1, NarG, NarGHI, narH, NarI, NarZ, nitrate reducatse A, nitrate reductase A, nitrate reductase Z, NRA nitrate reductase A, NRZ, NRZ nitrate reductase, Pden_4236, quinol-nitrate oxidoreductase, quinol/nitrate oxidoreductase, quinol:nitrate oxidoreductase, SCO6532, SCO6533, SCO6534, SCO6535
ECTree
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Engineering
Engineering on EC 1.7.5.1 - nitrate reductase (quinone)
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C196A
mutation results in the full loss of the four Fe-S clusters and of the Mo-cofactor, leading to inactive enzyme
C227A
mutation results in the full loss of the four Fe-S clusters and of the Mo-cofactor, leading to inactive enzyme
C263A
mutant retains significant nitrate reductase activity. EPR analysis shows that the highest redox potential [4Fe-4S] cluster (center 1) is selectively removed by the C263A mutation
C26A
mutant retains significant nitrate reductase activity. Mutation likely eliminates the lowest potential [4Fe-4S] cluster (center 4)
G65A
site-directed mutageness of subunit NarI, mutant G65A is able to support growth and retains significant quinol:nitrate oxidoreductase activity
H187Y
H205Y
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mutant without heme bH but with heme bL, a smaller and slower heme reduction compared to that of the wild-type enzyme is observed. A transient species, likely to be associated with a semiquinone radical anion, is generated not only on reduction of the wild-type enzyme but also on reduction of NarGHIH56R and NarGHIH205Y. Compared to the wild type, no significant heme reoxidation is observed for NarGHIH56R and NarGHIH205Y. This result indicates that a single mutation removing heme bH blocks the electron-transfer pathway from the subunit NarI to the catalytic dimer NarGH
H49S
the mutant lacks catalytic activity and the FS0 [4Fe-4S] cluster and molybdo-bis(pyranopterin guanine dinucleotide) cofactor but retains the GDP moieties
H56R
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mutant without heme bH but with heme bL, a smaller and slower heme reduction compared to that of the wild-type enzyme is observed. A transient species, likely to be associated with a semiquinone radical anion, is generated not only on reduction of the wild-type enzyme but also on reduction of NarGHIH56R and NarGHIH205Y. Compared to the wild type, no significant heme reoxidation is observed for NarGHIH56R and NarGHIH205Y. This result indicates that a single mutation removing heme bH blocks the electron-transfer pathway from the subunit NarI to the catalytic dimer NarGH
H56Y
H66Y
K86A
R94S
the mutant shows a concomitant decrease in enzyme turnover to about 30% of the wild type
H49S
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the mutant lacks catalytic activity and the FS0 [4Fe-4S] cluster and molybdo-bis(pyranopterin guanine dinucleotide) cofactor but retains the GDP moieties
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R94S
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the mutant shows a concomitant decrease in enzyme turnover to about 30% of the wild type
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additional information
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mutant enzyme lacking the highest-potential [4Fe-4S] cluster is devoid of menadione activity, but still retains duroquinone activity
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mutant lacking heme bL but having heme bH, the heme reduction by menadiol is abolished
H187Y
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mutant lacking the distal heme bD, no EPR signal of the semiquinone is observed
H187Y
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mutant lacks the distal heme bD, no EPR signal of the semiquinone is observed
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a semiquinone is detected in the mutant lacking the proximal heme bP. Its thermodynamic properties and spectroscopic characteristics, as revealed by Q-band EPR and ENDOR spectroscopies, are identical to those observed in the native enzyme
H56Y
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mutant lacks the distal heme bD, a EPR signal of the semiquinone is observed
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mutant lacking heme bL but having heme bH, the heme reduction by menadiol is abolished
H66Y
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mutant lacking the distal heme bD, no EPR signal of the semiquinone is observed
H66Y
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mutant lacks the distal heme bD, no EPR signal of the semiquinone is observed
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mutant has a lower plumbagin:nitrate oxidoreductase activity than the wild-type enzyme, 10/s compared with 68/s, respectively
K86A
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mutation dramatically reduces the rate of oxidation of both menaquinol and ubiquinol analogues
K86A
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the mutation close to heme bD leads to the loss of the EPR signal of the semiquinone, although both hemes are present, the substitution dramatically reduces the rate of oxidation of both mena and ubiquinol analogues