Figure 4
The Na+-binding site between domains 5 and 6. (a) An overall view with the main chains of domains 5 and 6 coloured blue and green, respectively. (b) A detailed view of the bonding in the vicinity of the Na4 cation site. In (b) Ile756 is not shown for clarity, although its main-chain N atom forms a hydrogen bond with W115 on the left-hand side of the figure (see Table 6). |