Figure 4 - full size

Figure 4.
Fig. 4. Residues involved in proton translocation and coupling. Hydrogen bonds are represented by dashed black lines. Transmembrane helices in the N- and C-terminal domains are colored blue and red, respectively. Color code for atoms is as in Fig. 3. (A) Stereo view parallel to the membrane. (B) Stereo view along the membrane normal from the cytoplasmic side.