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TABLE 14.1 Standard reduction potentials of interest in biochemistry Oxidant Reductant E" (V) Acetate + CO2 + 2H* + 2e Pyruvate + H20 -0.70 Succinate + CO2 + 2H* + 2e a-Ketoglutarate + H,0 -0.67 Acetate + 3H* + 2e -0.60 Acetaldehyde + H,0 Ferredoxin (reduced) 2 Ferredoxin (oxidized) + e 1 -0.43 2H* + 2e H2 2 -0.42 a-Ketoglutarate + CO, + 2H+ + 2e Isocitrate -0.38 Acetoacetate + 2H+ + 2e B-Hydroxybutyrate -0.35 Pyruvate + CO, + H* + 2e Malate -0.33 NAD+ + H* + 2e NADH -0.32 NADP* + H* + 2e NADPH 2 -0.32 Lipoate (oxidized) + 2H* + 2e Lipoate (reduced) -0.29 1,3-Bisphosphoglycerate + 2H* + 2e Glyceraldehyde-3-phosphate + P -0.29 Glutathione (oxidized) + 2H* + 2e 2 Glutathione (reduced) -0.23 FAD (free coenzyme) + 2H* + 2e FADH2 2 -0.22 Acetaldehyde + 2H + 2e Pyruvate + 2H + 2e Ethanol 2 -0.20 Lactate 2 -0.19 Oxaloacetate + 2H* + 2e Malate -0.17 O2 + e a-Ketoglutarate + NHị + 2H + 2e O (superoxide) Glutamate + H,0 1 -0.16 -0.14 FAD (enzyme-bound) + 2H* + 2e FADH, (enzyme-bound) -0 to -0.30 Methylene blue (oxidized) + 2H* + 2e Methylene blue (reduced) 0.01 Fumarate + 2H* + 2e Succinate 2 0.03 Q + 2H* + 2e Dehydroascorbate + 2H* + 2e Cytochrome b (+3) + e QH2 2 0.04 Ascorbate 0.06 Cytochrome b (+2) 0.07 Cytochrome c, (+3) + e Cytochrome c, (+2) 1 0.23 Cytochrome c (+3) + e Cytochrome c (+2) 1 0.25 Cytochrome a (+3) + e Cytochrome a (+2) 1 0.29 O2 + 2H+ + 2e H2O2 0.30 Ferricyanide + 2e Ferrocyanide 2 0.36 NO, (Nitrate) + 2H* + 2e NO, (Nitrite) + H2O 2 0.42 Cytochrome a,(+3) + e Cytochrome a, (+2) 0.55 Fe (+3) + e Fe (+2) 1 0.77 0, + 2H* + 2e H20 0.82 Note: E" is the standard reduction potential at pH 7 and 25 °C, n is the number of electrons transferred, and each potential is for the partial reaction written as follows: Oxidant + ne = reductant.

TABLE 14.1 Standard reduction potentials of interest in biochemistry Oxidant Reductant E" (V) Acetate + CO2 + 2H* + 2e Pyruvate + H20 -0.70 Succinate + CO2 + 2H* + 2e a-Ketoglutarate + H,0 -0.67 Acetate + 3H* + 2e -0.60 Acetaldehyde + H,0 Ferredoxin (reduced) 2 Ferredoxin (oxidized) + e 1 -0.43 2H* + 2e H2 2 -0.42 a-Ketoglutarate + CO, + 2H+ + 2e Isocitrate -0.38 Acetoacetate + 2H+ + 2e B-Hydroxybutyrate -0.35 Pyruvate + CO, + H* + 2e Malate -0.33 NAD+ + H* + 2e NADH -0.32 NADP* + H* + 2e NADPH 2 -0.32 Lipoate (oxidized) + 2H* + 2e Lipoate (reduced) -0.29 1,3-Bisphosphoglycerate + 2H* + 2e Glyceraldehyde-3-phosphate + P -0.29 Glutathione (oxidized) + 2H* + 2e 2 Glutathione (reduced) -0.23 FAD (free coenzyme) + 2H* + 2e FADH2 2 -0.22 Acetaldehyde + 2H + 2e Pyruvate + 2H + 2e Ethanol 2 -0.20 Lactate 2 -0.19 Oxaloacetate + 2H* + 2e Malate -0.17 O2 + e a-Ketoglutarate + NHị + 2H + 2e O (superoxide) Glutamate + H,0 1 -0.16 -0.14 FAD (enzyme-bound) + 2H* + 2e FADH, (enzyme-bound) -0 to -0.30 Methylene blue (oxidized) + 2H* + 2e Methylene blue (reduced) 0.01 Fumarate + 2H* + 2e Succinate 2 0.03 Q + 2H* + 2e Dehydroascorbate + 2H* + 2e Cytochrome b (+3) + e QH2 2 0.04 Ascorbate 0.06 Cytochrome b (+2) 0.07 Cytochrome c, (+3) + e Cytochrome c, (+2) 1 0.23 Cytochrome c (+3) + e Cytochrome c (+2) 1 0.25 Cytochrome a (+3) + e Cytochrome a (+2) 1 0.29 O2 + 2H+ + 2e H2O2 0.30 Ferricyanide + 2e Ferrocyanide 2 0.36 NO, (Nitrate) + 2H* + 2e NO, (Nitrite) + H2O 2 0.42 Cytochrome a,(+3) + e Cytochrome a, (+2) 0.55 Fe (+3) + e Fe (+2) 1 0.77 0, + 2H* + 2e H20 0.82 Note: E" is the standard reduction potential at pH 7 and 25 °C, n is the number of electrons transferred, and each potential is for the partial reaction written as follows: Oxidant + ne = reductant.

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From E °' values in Table 14.1, calculate the equilibrium constant for the glutathione peroxidase reaction at 37 °C.

TABLE 14.1 Standard reduction potentials of interest in biochemistry Oxidant Reductant E" (V) Acetate + CO2 + 2H* + 2e Pyruvate + H20 -0.70 Succinate + CO2 + 2H* + 2e a-Ketoglutarate + H,0 -0.67 Acetate + 3H* + 2e -0.60 Acetaldehyde + H,0 Ferredoxin (reduced) 2 Ferredoxin (oxidized) + e 1 -0.43 2H* + 2e H2 2 -0.42 a-Ketoglutarate + CO, + 2H+ + 2e Isocitrate -0.38 Acetoacetate + 2H+ + 2e B-Hydroxybutyrate -0.35 Pyruvate + CO, + H* + 2e Malate -0.33 NAD+ + H* + 2e NADH -0.32 NADP* + H* + 2e NADPH 2 -0.32 Lipoate (oxidized) + 2H* + 2e Lipoate (reduced) -0.29 1,3-Bisphosphoglycerate + 2H* + 2e Glyceraldehyde-3-phosphate + P -0.29 Glutathione (oxidized) + 2H* + 2e 2 Glutathione (reduced) -0.23 FAD (free coenzyme) + 2H* + 2e FADH2 2 -0.22 Acetaldehyde + 2H + 2e Pyruvate + 2H + 2e Ethanol 2 -0.20 Lactate 2 -0.19 Oxaloacetate + 2H* + 2e Malate -0.17 O2 + e a-Ketoglutarate + NHị + 2H + 2e O (superoxide) Glutamate + H,0 1 -0.16 -0.14 FAD (enzyme-bound) + 2H* + 2e FADH, (enzyme-bound) -0 to -0.30 Methylene blue (oxidized) + 2H* + 2e Methylene blue (reduced) 0.01 Fumarate + 2H* + 2e Succinate 2 0.03 Q + 2H* + 2e Dehydroascorbate + 2H* + 2e Cytochrome b (+3) + e QH2 2 0.04 Ascorbate 0.06 Cytochrome b (+2) 0.07 Cytochrome c, (+3) + e Cytochrome c, (+2) 1 0.23 Cytochrome c (+3) + e Cytochrome c (+2) 1 0.25 Cytochrome a (+3) + e Cytochrome a (+2) 1 0.29 O2 + 2H+ + 2e H2O2 0.30 Ferricyanide + 2e Ferrocyanide 2 0.36 NO, (Nitrate) + 2H* + 2e NO, (Nitrite) + H2O 2 0.42 Cytochrome a,(+3) + e Cytochrome a, (+2) 0.55 Fe (+3) + e Fe (+2) 1 0.77 0, + 2H* + 2e H20 0.82 Note: E" is the standard reduction potential at pH 7 and 25 °C, n is the number of electrons transferred, and each potential is for the partial reaction written as follows: Oxidant + ne = reductant.
Transcribed Image Text:TABLE 14.1 Standard reduction potentials of interest in biochemistry Oxidant Reductant E" (V) Acetate + CO2 + 2H* + 2e Pyruvate + H20 -0.70 Succinate + CO2 + 2H* + 2e a-Ketoglutarate + H,0 -0.67 Acetate + 3H* + 2e -0.60 Acetaldehyde + H,0 Ferredoxin (reduced) 2 Ferredoxin (oxidized) + e 1 -0.43 2H* + 2e H2 2 -0.42 a-Ketoglutarate + CO, + 2H+ + 2e Isocitrate -0.38 Acetoacetate + 2H+ + 2e B-Hydroxybutyrate -0.35 Pyruvate + CO, + H* + 2e Malate -0.33 NAD+ + H* + 2e NADH -0.32 NADP* + H* + 2e NADPH 2 -0.32 Lipoate (oxidized) + 2H* + 2e Lipoate (reduced) -0.29 1,3-Bisphosphoglycerate + 2H* + 2e Glyceraldehyde-3-phosphate + P -0.29 Glutathione (oxidized) + 2H* + 2e 2 Glutathione (reduced) -0.23 FAD (free coenzyme) + 2H* + 2e FADH2 2 -0.22 Acetaldehyde + 2H + 2e Pyruvate + 2H + 2e Ethanol 2 -0.20 Lactate 2 -0.19 Oxaloacetate + 2H* + 2e Malate -0.17 O2 + e a-Ketoglutarate + NHị + 2H + 2e O (superoxide) Glutamate + H,0 1 -0.16 -0.14 FAD (enzyme-bound) + 2H* + 2e FADH, (enzyme-bound) -0 to -0.30 Methylene blue (oxidized) + 2H* + 2e Methylene blue (reduced) 0.01 Fumarate + 2H* + 2e Succinate 2 0.03 Q + 2H* + 2e Dehydroascorbate + 2H* + 2e Cytochrome b (+3) + e QH2 2 0.04 Ascorbate 0.06 Cytochrome b (+2) 0.07 Cytochrome c, (+3) + e Cytochrome c, (+2) 1 0.23 Cytochrome c (+3) + e Cytochrome c (+2) 1 0.25 Cytochrome a (+3) + e Cytochrome a (+2) 1 0.29 O2 + 2H+ + 2e H2O2 0.30 Ferricyanide + 2e Ferrocyanide 2 0.36 NO, (Nitrate) + 2H* + 2e NO, (Nitrite) + H2O 2 0.42 Cytochrome a,(+3) + e Cytochrome a, (+2) 0.55 Fe (+3) + e Fe (+2) 1 0.77 0, + 2H* + 2e H20 0.82 Note: E" is the standard reduction potential at pH 7 and 25 °C, n is the number of electrons transferred, and each potential is for the partial reaction written as follows: Oxidant + ne = reductant.
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