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(A) Membrane topology model of RnfA. RnfA-E109 is colored red. (B) Homology model of RnfA superimposed on the NqrE structure. RnfA-E109 (red) and the corresponding residue in Na+-NQR (NqrE-E95, yellow) are highlighted. The model created using RaptorX was selected as the best model; this selection was made on the basis of comparison to our RnfA topology data and the crystallographic structure of Na+-NQR.15
