Fig. 5.

Stereoviews of the Ca²⁺-binding site of YfkE (gray) superimposed on NCX_Mj (green). Conformational changes of the residues in the Ca²⁺-binding site (A) and in the abolished Na⁺-binding sites (B). The residues from both structures are labeled and the counterpart residues from NCX_Mj are underlined.