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The hexammineruthenium (HAR) and ferricyanide reductase activities of Complex I (H + -translocating NADH:ubiquinone reductase) from Paracoccus denitrificans and bovine heart mitochondria were studied. The rates of HAR reduction are high, and its steady-state kinetics is similar in both P. denitrificans and bovine Complex I. The deamino-NADH:HAR reductase activity of Complex I from both sources...
The NADH:ubiquinone reductase (NDH-2) of Escherichia coli was expressed as a His-tagged protein, extracted from the membrane fraction using detergent and purified by chromatography. The His-tagged NDH-2 was highly active and catalyzed NADH oxidation by ubiquinone-1 at rates over two orders of magnitude higher than previously reported. The purified, His-tagged NDH-2, like native NDH-2, did not oxidize...
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