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Revealing the Membrane-Bound Catalytic Oxidation of NADH by the Drug Target Type-II NADH Dehydrogenase. | LitMetric
Type-II NADH:quinone oxidoreductases (NDH-2s) are an important element of microbial pathogen electron transport chains and an attractive drug target. Despite being widely studied, its mechanism and catalysis are still poorly understood in a hydrophobic membrane environment. A recent report for the NDH-2 showed NADH oxidation in a solution-based assay but apparently showed the reverse reaction in electrochemical studies, calling into question the validity of the electrochemical approach. Here we report electrochemical catalysis in the well-studied NDH-2 from (NDH-2). In agreement with previous reports, we demonstrated NDH-2 NADH oxidation in a solution assay and electrochemical assays revealed a system artifact in the absence of quinone that was absent in a membrane system. However, in the presence of either immobilized quinone or mobile quinone in a membrane, NADH oxidation was observed as in solution-phase assays. This conclusively establishes surface-based electrochemistry as a viable approach for interrogating electron transfer chain drug targets.
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