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Copper (II) complex-catalyzed oxidation of NADH by hydrogen peroxide

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Abstract

Among various metal ions of physiological interest, Cu2+ is uniquely capable of catalyzing the oxidation of NADH by H2O2. This oxidation is stimulated about fivefold in the presence of imidazole. A similar activating effect is found for some imidazole derivatives (1-methyl imidazole, 2-methyl imidazole, andN-acetyl-L-histidine). Some other imidazole-containing compounds (L-histidine,L-histidine methyl ester, andL-carnosine), however, inhibit the Cu2+-catalyzed peroxidation of NADH. Other chelating agents such as EDTA andL-alanine are also inhibitory. Stoichiometry for NADH oxidation per mole of H2O2 utilized is 1, which excludes the possibility of a two-step oxidation mechanism with a nucleotide free-radical intermediate. About 92% of the NADH oxidation product can be identified as enzymatically active NAD+. D2O, 2,5-dimethylfuran, and 1,4-diazabicyclo [2.2.2]-octane have no significant effect on the oxidation, thus excluding1O2 as a mediator. Similarly, OH· is also not a likely intermediate, since the system is not affected by various scavengers of this radical. The results suggest that a copper-hydrogen peroxide intermediate, when complexed with suitable ligands, can generate still another oxygen species much more reactive than its parent compound, H2O2.

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Authors and Affiliations

  1. Department of Biochemistry, State University of New York Downstate Medical Center, 11203, Brooklyn, New York

    Phillip C. Chan & Leo Kesner

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  1. Phillip C. Chan
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  2. Leo Kesner
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Chan, P.C., Kesner, L. Copper (II) complex-catalyzed oxidation of NADH by hydrogen peroxide. Biol Trace Elem Res 2, 159–174 (1980). https://doi.org/10.1007/BF02785352

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  • DOI: https://doi.org/10.1007/BF02785352

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