Abstract

As a novel member of the new class of non-proton cation pumping rhodopsins, the light-driven sodium pump Krokinobacter eikastus rhodopsin 2 (KR2) boosted interest in the field of optogenetics, since it is a possible candidate for the application as a neural silencer. Even though a tremendous amount of work has yet been done on microbial rhodopsins in general, but also on KR2 in particular, many questions concerning structure-function relationship, transport mechanisms and chromophore-protein interactions and dynamics remain vividly debated.

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