Figure 7.

Distribution of distances between E101 and Y288 in different protonation models of CcO. For the other models, see Figure S7. The different models are labelled according to the protonation states of residues D132, E286, K362, and E101, where “0” means unprotonated and “1” means protonated (see Table 5 in “Materials and Methods”). Letters a–f refer to a ${\mathrm{H}}_3{\mathrm{O}}^{+}$ ion in the K-channel at different heights (see also Figure 20d in “Materials and Methods”).