Observation of structural changes in light-driven sodium ion pump KR2 upon sodium ion binding

摘要

Krokinobacter rhodopsin 2 (KR2) works as a light-driven Na~+ pump in the presence of Na~+, while as a H~+ pump in the presence of larger monovalent cation such as K~+.1 This means that KR2 is able to alter the transporting ion depending on the cation composition.