Abstract
During aerobic growth of Escherichia coli, nicotinamide adenine dinucleotide (NADH) can initiate electron transport at either of two sites: Complex I (NDH-1 or NADH: ubiquinone oxidoreductase) or a single-subunit NADH dehydrogenase (NDH-2). We report evidence for the specific coupling of malate dehydrogenase to Complex I. Membrane vesicles prepared from wild type cultures retain malate dehydrogenase and are capable of proton translocation driven by the addition of malate+NAD. This activity was inhibited by capsaicin, an inhibitor specific to Complex I, and it proceeded with deamino-NAD, a substrate utilized by Complex I, but not by NDH-2. The concentration of free NADH produced by membrane vesicles supplemented with malate+NAD was estimated to be 1 μM, while the rate of proton translocation due to Complex I was consistent with a some what higher concentration, suggesting a direct transfer mechanism. This interpretation was supported by competition assays in which inactive mutant forms of malate dehydrogenase were able to inhibit Complex I activity.
These two lines of evidence indicate that the direct transfer of NADH from malate dehydrogenase to Complex I can occur in the E. coli system.
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Amarneh, B., Vik, S.B. Direct transfer of NADH from malate dehydrogenase to Complex I in Escherichia coli . Cell Biochem Biophys 42, 251–261 (2005). https://doi.org/10.1385/CBB:42:3:251
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DOI: https://doi.org/10.1385/CBB:42:3:251