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Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
12/28 - 12/31
for maintenance.
Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
12/28 - 12/31
for maintenance.
Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
12/28 - 12/31
for maintenance.
Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites down
12/28 - 12/31
for maintenance.
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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 + 4 H+ + 4 e- → hydrazine ,
-0.432 V: CO2[out] + H+[out] + 2 e- → formate[out] ,
-0.414 V: 2 H+[in] + 2 e- ↔ H2[in] ,
-0.414 V: 2 H+[out] + 2 e- → H2[out] ,
-0.400 V: an oxidized ferredoxin[out] + e- → a reduced ferredoxin[out] ,
-0.370 V: 2 NADP+[in] + 2 H+[in] + 4 e- → 2 NADPH[in] ,
-0.320 V: NAD+[in] + H+[in] + 2 e- → NADH[in] ,
-0.200 V: 5,10-methylenetetrahydropteroyl mono-L-glutamate[in] + 2 H+[in] + 2 e-N5-methyl-tetrahydropteroyl mono-L-glutamate[in] ,
-0.200 V: orotate[in] + 2 H+[in] + 2 e- → (S)-dihydroorotate[in] ,
-0.190 V: pyruvate[in] + 2 H+[in] + 2 e- → (S)-lactate[in] ,
-0.190 V: dihydroxyacetone phosphate[in] + 2 H+[in] + 2 e-sn-glycerol 3-phosphate[in] ,
-0.190 V: pyruvate[in] + 2 H+[in] + 2 e- → (R)-lactate[in] ,
-0.123 V: (S)-1-pyrroline-5-carboxylate[in] + 3 H+[in] + 2 e- → L-proline[in] ,
-0.123 V: pyrroline-hydroxy-carboxylate[in] + 3 H+[in] + 2 e-trans-4-hydroxy-L-proline[in] ,
-0.074 V: a menaquinone + 2 H+[in] + 2 e- → a menaquinol ,
-0.074 V: a menaquinone + 2 H+[out] + 2 e- → a menaquinol ,
-0.063 V: a rhodoquinone + 2 H+[in] + 2 e- → a rhodoquinol ,
0.000 V: FAD[in] + 2 H+[in] + 2 e- → FADH2[in] ,
0.000 V: sulfate[in] + intracellular S0n+1[in] + 3 H+[in] + 2 e- → thiosulfate[in] + intracellular S0n[in] + H2O[in] ,
0.000 V: acetate[in] + CO2[in] + 2 H+[in] + 2 e- → pyruvate[in] + H2O[in] ,
0.000 V: 2 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonate) radical cation + e- ← 2 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonate) ,
0.000 V: a plastoquinone + 4 H+[in] + 2 e- → a plastoquinol + 2 H+[out] ,
0.000 V: an oxidized cytochrome c552[in] + e- → a reduced cytochrome c552[in] ,
0.000 V: ammonia[in] + oxygen[in] + 2 H+[in] + 2 e- → hydroxylamine[in] + H2O[in] ,
0.000 V: an oxidized electron acceptor[in] + 2 H+[in] + 2 e- → a reduced electron acceptor[in] ,
0.000 V: D-glucono-1,5-lactone[out] + 2 H+[out] + 2 e- → D-glucopyranose[out] ,
0.000 V: a 2-oxo carboxylate[in] + ammonium[in] + 2 H+[in] + 2 e- → a D-amino acid[in] + H2O[in] ,
0.000 V: pyruvate[in] + ammonium[in] + 2 H+[in] + 2 e- → D-alanine[in] + H2O[in] ,
0.033 V: fumarate[in] + 2 H+[in] + 2 e- → succinate[in] ,
0.060 V: nitric oxide + ammonium + 2 H+ + 3 e- → hydrazine + H2O ,
0.080 V: a plastoquinone + 2 H+[in] + 2 e- → a plastoquinol ,
0.080 V: a plastoquinone + 2 H+[out] + 2 e- → a plastoquinol ,
0.080 V: tetrathionate[out] + 2 H+[out] + 4 e- → 2 thiosulfate[out] ,
0.100 V: nitrite[in] + 5 H+[in] + 4 e- → hydroxylamine[in] + H2O[in] ,
0.110 V: ubiquinone-8 + 2 H+[in] + 2 e- → ubiquinol-8 ,
0.110 V: caldariellaquinone + 2 H+[out] + 2 e- → caldariellaquinol ,
0.110 V: an ubiquinone + 2 H+[in] + 2 e- → an ubiquinol ,
0.110 V: an electron-transfer-related quinone + 2 H+[in] + 2 e- → an electron-transfer-related quinol ,
0.110 V: an ubiquinone + 2 H+[out] + 2 e- → an ubiquinol ,
0.130 V: trimethylamine N-oxide[out] + 3 H+[out] + 2 e- → trimethylamine[out] + H2O[out] ,
0.160 V: dimethyl sulfoxide[out] + 2 H+[out] + 2 e- → dimethyl sulfide[out] + H2O[out] ,
0.254 V: an oxidized c-type cytochrome[out] + e- → a reduced c-type cytochrome[out] ,
0.280 V: monodehydroascorbate radical[in] + e- → L-ascorbate[in] ,
0.340 V: nitrite + 8 H+ + 6 e- → ammonium + 2 H2O ,
0.340 V: an oxidized azurin[in] + e- → a reduced azurin[in] ,
0.360 V: nitrite + 2 H+ + e- → nitric oxide + H2O ,
0.370 V: an oxidized plastocyanin[in] + e- → a reduced plastocyanin[in] ,
0.430 V: nitrate + 2 H+ + 2 e- → nitrite + H2O ,
0.433 V: nitrate[out] + 2 H+[out] + 2 e- → nitrite[out] + H2O[out] ,
0.433 V: nitrate[in] + 2 H+[in] + 2 e- → nitrite[in] + H2O[in] ,
0.480 V: an oxidized cytochrome c4[in] + e- → a reduced cytochrome c4[in] ,
0.480 V: an oxidized CycA1 cytochrome[out] + e- → a reduced CycA1 cytochrome[out] ,
0.480 V: an oxidized Cyc1 cytochrome[out] + e- → a reduced Cyc1 cytochrome[out] ,
0.560 V: arsenate[in] + 3 H+[in] + 2 e- → arsenite[in] + H2O[in] ,
0.560 V: arsenate[out] + 3 H+[out] + 2 e- → arsenite[out] + H2O[out] ,
0.570 V: 2 sulfate[in] + 11 H+[in] + 8 e- ↔ thiosulfate[in] + 5 H2O[in] ,
0.680 V: an oxidized rusticyanin[in] + e- → a reduced rusticyanin[in] ,
0.680 V: an oxidized rusticyanin[out] + e- → a reduced rusticyanin[out] ,
0.680 V: oxygen[out] + 2 H+[out] + 2 e- → hydrogen peroxide[out] ,
0.740 V: ammonium + oxygen + H+ + 2 e- → hydroxylamine + H2O ,
0.770 V: Fe3+[out] + e- → Fe2+[out] ,
0.770 V: Fe3+ + e- → Fe2+ ,
0.880 V: nitrate[in] + 10 H+[in] + 8 e- → ammonium[in] + 3 H2O[in] ,
0.960 V: nitrate[in] + 4 H+[in] + 3 e- → nitric oxide[in] + 2 H2O[in] ,
1.230 V: oxygen[in] + 4 H+[in] + 4 e- → 2 H2O[in] ,
1.350 V: hydroxylamine[in] + 3 H+[in] + 2 e- → ammonium[in] + H2O[in] ,
1.590 V: 2 nitric oxide + 2 H+ + 2 e- → nitrous oxide + H2O ,
1.770 V: nitrous oxide[in] + 2 H+[in] + 2 e- → N2[in] + H2O[in]


Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 18.5 on Sat Dec 20, 2014, biocyc11.