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• W2042722626 abstract "Proton translocation, coupled to formate oxidation and hydrogen evolution, was studied in anaerobically grown fermenting Escherichia coli JW136 carrying hydrogenase 1 (hya) and hydrogenase 2 (hyb) double deletions. Rapid acidification of the medium by EDTA-treated anaerobic suspension of the whole cells or its alkalization by inverted membranes was observed in response to application of formate. The formate-dependent proton translocation and 2H+–K+ exchange coupled to H2 evolution were sensitive to the uncoupler, carbonylcyanide-m-chlorophenylhydrazone, and to copper ions, inhibitors of hydrogenases. No pH changes were observed in a suspension of formate-pulsed aerobically grown (“respiring”) cells. The apparent H+/formate ratio of 1.3 was obtained in cells oxidizing formate. The 2H+–K+ exchange of the ATP synthase inhibitor N,N′-dicyclohexylcarbodiimide-sensitive ion fluxes does take place in JW136 cell suspension. Hydrogen formation from formate by cell suspensions of E. coli JW136 resulted in the formation of a membrane potential (Δψ) across the cytoplasmic membrane of −130 mV (inside negative). This was abolished in the presence of copper ions, although they had little effect on the value of Δψ generated by E. coli under respiration. We conclude that the hydrogen production by hydrogenase 3 is coupled to formate-dependent proton pumping that regulates 2H+–K+ exchange in fermenting bacteria." @default.
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• W2042722626 date "2005-05-01" @default.
• W2042722626 modified "2023-10-15" @default.
• W2042722626 title "Proton translocation coupled to formate oxidation in anaerobically grown fermenting Escherichia coli" @default.
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• W2042722626 doi "https://doi.org/10.1016/j.bpc.2005.01.002" @default.
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