H+-translocator oxidoreductases

Much less is known about the coupling numbers of the ion-pumping Ferre-doxin (Fd) NAD oxidoreductase (Rnf) and Energy converting hydrogenase (Ech). Isozymes of Rnf and Ech can translocate an unknown number of either Na or H" during the transfer of electrons between Fd and NAD(H) or Fd and respectively. In the present analysis, we will presume 2 H+ each, similar to previous reports [48,49]. 

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