Conformational coupling of redox-driven Na + -translocation in Vibrio cholerae NADH:quinone oxidoreductase.

In the respiratory chain, NADH oxidation is coupled to ion translocation across the membrane to build up an electrochemical gradient. In the human pathogen Vibrio cholerae, the sodium-pumping NADH:quinone oxidoreductase (Na + -NQR) generates a sodium gradient by a so far unknown mechanism. Here we show that ion pumping in Na + -NQR is driven by large conformational changes coupling electron transfer to ion translocation. We have determined a series of cryo-EM and X-ray structures of the Na + -NQR that represent snapshots of the catalytic cycle. The six subunits NqrA, B, C, D, E, and F of Na + -NQR harbor a unique set of cofactors that shuttle the electrons from NADH twice across the membrane to quinone. The redox state of a unique intramembranous [2Fe-2S] cluster orchestrates the movements of subunit NqrC, which acts as an electron transfer switch. We propose that this switching movement controls the release of Na + from a binding site localized in subunit NqrB.