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Proton conductance and regulation of proton/potassium fluxes in Escherichia coli FhlA-lacking cells during fermentation of mixed carbon sources.
Archives of Biochemistry and Biophysics 2024 April 16
Escherichia coli uptake potassium ions with the coupling of proton efflux and energy utilization via proton FO F1 -ATPase. In this study contribution of formate hydrogen lyase (FHL) complexes in the proton/potassium fluxes and the formation of proton conductance (CM H+ ) were investigated using fhlA mutant strain. The proton flux rate (JH+ ) decreased in fhlA by ∼ 25 % and ∼70 % during the utilization of glucose and glycerol, respectively, at 20 h suggesting H+ transport via or through FHL complexes. The decrease in JK+ in fhlA by ∼40 % proposed the interaction between FHL and Trk secondary transport system during mixed carbon fermentation. Moreover, the usage of N,N'-dicyclohexylcarbodiimide (DCCD) demonstrated the mediation of FO F1 -ATPase in this interaction. CM H+ was 13.4 nmol min-1 mV-1 in WT at 20 h, which decreased by 20 % in fhlA. Taken together, FHL complexes have a significant contribution to the modulation of H+ /K+ fluxes and the CM H + for efficient energy transduction and regulation of the proton motive force during mixed carbon sources fermentation.
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