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MetaCyc Reactions Class: Redox Half-Reactions

Summary:
Redox half reactions are elementary reactions, in which explicitly stated electrons are reducing an oxidized molecular species. These reactions do not stand alone, because electrons do not occur freely. Instead, a half reaction must be paired with another half reaction to form a complete, overall transformation.

The convention adopted here is to write the half reactions always in the same direction, namely in the form:

Ox. + e- --> Red.

In other words, the oxidized species and the electrons are always in the LEFT slot, and the reduced species are always in the RIGHT slot.

This reaction direction allows the standard reduction potential to be directly recorded in the STD-REDUCTION-POTENTIAL slot, such that reactions of this type are comparable with each other.

Parent Classes:
Simple Reactions

Instances:
-0.750 V: N2[membrane] + 4 H+[membrane] + 4 e-[membrane] → hydrazine[membrane],
-0.432 V: CO2[out] + H+[out] + 2 e-[membrane] → formate[out],
-0.414 V: 2 H+[in] + 2 e-[membrane] ↔ H2[in],
-0.414 V: 2 H+[out] + 2 e-[membrane] → H2[out],
-0.400 V: an oxidized ferredoxin [iron-sulfur] cluster[in] + e-[membrane] → a reduced ferredoxin [iron-sulfur] cluster[in],
-0.400 V: an oxidized ferredoxin [iron-sulfur] cluster[out] + e-[membrane] → a reduced ferredoxin [iron-sulfur] cluster[out],
-0.324 V: NADP+[in] + H+[in] + 2 e-[membrane] → NADPH[in],
-0.322 V: NAD(P)+[in] + H+[in] + 2 e-[membrane] → NAD(P)H[in],
-0.320 V: NAD+[in] + H+[in] + 2 e-[membrane] → NADH[in],
-0.200 V: 5,10-methylenetetrahydropteroyl mono-L-glutamate[in] + 2 H+[in] + 2 e-[membrane]N5-methyl-tetrahydropteroyl mono-L-glutamate[in],
-0.200 V: orotate[in] + 2 H+[in] + 2 e-[membrane] → (S)-dihydroorotate[in],
-0.190 V: pyruvate[in] + 2 H+[in] + 2 e-[membrane] → (S)-lactate[in],
-0.190 V: glycerone phosphate[in] + 2 H+[in] + 2 e-[membrane]sn-glycerol 3-phosphate[in],
-0.190 V: pyruvate[in] + 2 H+[in] + 2 e-[membrane] → (R)-lactate[in],
-0.166 V: oxaloacetate[in] + 2 H+[in] + 2 e-[membrane] → (S)-malate[in],
-0.123 V: (3R,5S)-1-pyrroline-3-hydroxy-5-carboxylate[in] + 3 H+[in] + 2 e-[membrane]trans-4-hydroxy-L-proline[in],
-0.123 V: (S)-1-pyrroline-5-carboxylate[in] + 3 H+[in] + 2 e-[membrane] → L-proline[in],
-0.074 V: a menaquinone[membrane] + 2 H+[out] + 2 e-[membrane] → a menaquinol[membrane],
-0.074 V: a menaquinone[membrane] + 2 H+[in] + 2 e-[membrane] → a menaquinol[membrane],
-0.063 V: a rhodoquinone[membrane] + 2 H+[in] + 2 e-[membrane] → a rhodoquinol[membrane],
0.000 V: sulfate[in] + intracellular S0n+1[in] + 3 H+[in] + 2 e-[membrane] → thiosulfate[in] + intracellular S0n[in] + H2O[in],
0.000 V: acetate[in] + CO2[in] + 2 H+[in] + 2 e-[membrane] → pyruvate[in] + H2O[in],
0.000 V: glycine betaine[in] + 3 H+[in] + 2 e-[membrane] → betaine aldehyde hydrate[in],
0.000 V: an oxidized unknown electron acceptor[in] + 2 H+[in] + 2 e-[membrane] → an reduced unknown electron acceptor[in],
0.000 V: an oxidized cytochrome c552[in] + e-[membrane] → a reduced cytochrome c552[in],
0.000 V: pyruvate[in] + ammonium[in] + 2 H+[in] + 2 e-[membrane] → D-alanine[in] + H2O[in],
0.000 V: a protein-L-methionine-(S)-S-oxide[out] + 2 H+[out] + 2 e-[membrane] → a [protein]-L-methionine[out] + H2O[out],
0.000 V: 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonate) radical cation[in] + e-[membrane] → 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonate)[in],
0.000 V: betaine aldehyde[in] + 2 H+[in] + 2 e-[membrane] → choline[in],
0.000 V: ammonia[in] + oxygen[in] + 2 H+[in] + 2 e-[membrane] → hydroxylamine[in] + H2O[in],
0.000 V: D-glucono-1,5-lactone[membrane] + 2 H+[membrane] + 2 e-[membrane] → D-glucopyranose[membrane],
0.000 V: a 2-oxo carboxylate[in] + ammonium[in] + 2 H+[in] + 2 e-[membrane] → a D-amino acid[in] + H2O[in],
0.000 V: a protein-L-methionine-(R)-S-oxide[out] + 2 H+[out] + 2 e-[membrane] → a [protein]-L-methionine[out] + H2O[out],
0.000 V: glyoxylate[in] + 2 H+[in] + 2 e-[membrane] → glycolate[in],
0.000 V: protoporphyrin IX[in] + 6 H+[in] + 6 e-[membrane] → protoporphyrinogen IX[in],
0.000 V: an oxidized electron-transfer flavoprotein[in] + 3 H+[in] + 2 e-[membrane] → a reduced electron-transfer flavoprotein[in],
0.000 V: FAD[in] + 3 H+[in] + 2 e-[membrane] → FADH2[in],
0.000 V: a plastoquinone[membrane] + 4 H+[in] + 2 e-[membrane] → a plastoquinol[membrane] + 2 H+[out],
0.000 V: 2-oxobutanoate[in] + 2 H+[in] + 2 e-[membrane] → (S)-2-hydroxybutanoate[in],
0.033 V: fumarate[in] + 2 H+[in] + 2 e-[membrane] → succinate[in],
0.060 V: nitric oxide[membrane] + ammonium[membrane] + 2 H+[membrane] + 3 e-[membrane] → hydrazine[membrane] + H2O[membrane],
0.080 V: a plastoquinone[membrane] + 2 H+[out] + 2 e-[membrane] → a plastoquinol[membrane],
0.080 V: a plastoquinone[membrane] + 2 H+[in] + 2 e-[membrane] → a plastoquinol[membrane],
0.080 V: tetrathionate[out] + 2 H+[out] + 2 e-[membrane] → 2 thiosulfate[out],
0.100 V: nitrite[in] + 5 H+[in] + 4 e-[membrane] → hydroxylamine[in] + H2O[in],
0.110 V: ubiquinone-8[membrane] + 2 H+[in] + 2 e-[membrane] → ubiquinol-8[membrane],
0.110 V: a ubiquinone[membrane] + 2 H+[in] + 2 e-[membrane] → an ubiquinol[membrane],
0.110 V: caldariellaquinone[membrane] + 2 H+[in] + 2 e-[membrane] → caldariellaquinol[membrane],
0.110 V: an electron-transfer quinone[membrane] + 2 H+[out] + 2 e-[membrane] → an electron-transfer quinol[membrane],
0.110 V: an electron-transfer quinone[membrane] + 2 H+[in] + 2 e-[membrane] → an electron-transfer quinol[membrane],
0.110 V: a ubiquinone[membrane] + 2 H+[out] + 2 e-[membrane] → an ubiquinol[membrane],
0.130 V: trimethylamine N-oxide[out] + 3 H+[out] + 2 e-[membrane] → trimethylamine[out] + H2O[out],
0.160 V: dimethyl sulfoxide[out] + 2 H+[out] + 2 e-[membrane] → dimethyl sulfide[out] + H2O[out],
0.254 V: an oxidized c-type cytochrome[out] + e-[membrane] → a reduced c-type cytochrome[out],
0.254 V: an oxidized c-type cytochrome[in] + e-[membrane] → a reduced c-type cytochrome[in],
0.254 V: an oxidized cytochrome c551[out] + e-[membrane] → a reduced cytochrome c551[out],
0.280 V: monodehydroascorbate radical[in] + e-[membrane] → L-ascorbate[in],
0.340 V: nitrite[in] + 8 H+[in] + 6 e-[membrane] → ammonium[in] + 2 H2O[in],
0.340 V: an oxidized azurin[in] + e-[membrane] → a reduced azurin[in],
0.340 V: nitrite[out] + 8 H+[out] + 6 e-[membrane] → ammonium[out] + 2 H2O[out],
0.360 V: nitrite[out] + 2 H+[out] + e-[membrane] → nitric oxide[out] + H2O[out],
0.370 V: an oxidized plastocyanin[in] + e-[membrane] → a reduced plastocyanin[in],
0.433 V: nitrate[out] + 2 H+[out] + 2 e-[membrane] → nitrite[out] + H2O[out],
0.433 V: nitrate[in] + 2 H+[in] + 2 e-[membrane] → nitrite[in] + H2O[in],
0.480 V: an oxidized Cyc1 cytochrome[out] + e-[membrane] → a reduced Cyc1 cytochrome[out],
0.480 V: an oxidized CycA1 cytochrome[out] + e-[membrane] → a reduced CycA1 cytochrome[out],
0.480 V: an oxidized cytochrome c4[in] + e-[membrane] → a reduced cytochrome c4[in],
0.560 V: arsenate[in] + 3 H+[in] + 2 e-[membrane] → arsenite[in] + H2O[in],
0.560 V: arsenate[out] + 3 H+[out] + 2 e-[membrane] → arsenite[out] + H2O[out],
0.570 V: 2 sulfate[in] + 11 H+[in] + 8 e-[membrane] ↔ thiosulfate[in] + 5 H2O[in],
0.680 V: oxygen[out] + 2 H+[out] + 2 e-[membrane] → hydrogen peroxide[out],
0.680 V: an oxidized rusticyanin[in] + e-[membrane] → a reduced rusticyanin[in],
0.680 V: an oxidized rusticyanin[out] + e-[membrane] → a reduced rusticyanin[out],
0.740 V: ammonium[membrane] + oxygen[membrane] + H+[membrane] + 2 e-[membrane] → hydroxylamine[membrane] + H2O[membrane],
0.770 V: Fe3+[out] + e-[membrane] → Fe2+[out],
0.770 V: Fe3+[membrane] + e-[membrane] → Fe2+[membrane],
0.880 V: nitrate[in] + 10 H+[in] + 8 e-[membrane] → ammonium[in] + 3 H2O[in],
0.960 V: nitrate[in] + 4 H+[in] + 3 e-[membrane] → nitric oxide[in] + 2 H2O[in],
1.230 V: oxygen[in] + 4 H+[in] + 4 e-[membrane] → 2 H2O[in],
1.350 V: hydroxylamine[in] + 3 H+[in] + 2 e-[membrane] → ammonium[in] + H2O[in],
1.590 V: 2 nitric oxide[out] + 2 H+[out] + 2 e-[membrane] → nitrous oxide[out] + H2O[out],
1.770 V: nitrous oxide[out] + 2 H+[out] + 2 e-[membrane] → N2[out] + H2O[out]


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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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