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Light-driven sodium-pumping rhodopsins are able to actively transport sodium ions. Structure/function studies of Krokinobacter eikastus rhodopsin 2 (KR2) identified N61 and G263 at the cytoplasmic surface constituting the “Ion-selectivity filter” for sodium ions, while retinal Schiff base acts as the light “Switch and Gate” for transport of sodium ions. Q123 is located between the two regions, and...
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