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• W2076564802 abstract "The catalysis of NAD+ reduction by Rhodococcus opacus hydrogenase was investigated by spectroelectrochemistry in a thin layer cell on a platinum electrode. The NADH formation rates were significantly higher than those obtained with the hydrogenase of Alcaligenes eutrophus which has previously been identified as a good catalyst of this electrochemical reduction. As a consequence, for the first time to our knowledge, a well-identified current peak which corresponded to NAD+ reduction was observed on the voltammograms obtained with a platinum cathode. Thanks to the efficiency of this catalysis, it has been possible to improve the understanding of the mechanism. A two-step mechanism was assumed, according to the structure of the hydrogenase which is composed of two dimers with distinct hydrogenase and diaphorase activity. At high potentials (above −0.66 V (SCE)) only the diaphorase dimer was reduced by direct electron transfer from the electrode, without intervention of any hydrogen intermediate. For more negative potentials, a reduced hydrogen species adsorbed on the electrode surface was involved in the mechanism. In this case, catalysis followed a more classic catalytic pathway via the hydrogenase dimer and an intramolecular electron transfer to the diaphorase dimer, which reduced NAD+." @default.
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• W2076564802 date "1996-04-01" @default.
• W2076564802 modified "2023-10-18" @default.
• W2076564802 title "Direct electrochemistry of Rhodococcus opacus hydrogenase for the catalysis of NAD+ reduction" @default.
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• W2076564802 doi "https://doi.org/10.1016/0022-0728(95)04419-1" @default.
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