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Pumping mechanism of NM-R3, a light-driven bacterial chloride importer in the rhodopsin family.


ABSTRACT: A newly identified microbial rhodopsin, NM-R3, from the marine flavobacterium Nonlabens marinus, was recently shown to drive chloride ion uptake, extending our understanding of the diversity of mechanisms for biological energy conversion. To clarify the mechanism underlying its function, we characterized the crystal structures of NM-R3 in both the dark state and early intermediate photoexcited states produced by laser pulses of different intensities and temperatures. The displacement of chloride ions at five different locations in the model reflected the detailed anion-conduction pathway, and the activity-related key residues-Cys105, Ser60, Gln224, and Phe90-were identified by mutation assays and spectroscopy. Comparisons with other proteins, including a closely related outward sodium ion pump, revealed key motifs and provided structural insights into light-driven ion transport across membranes by the NQ subfamily of rhodopsins. Unexpectedly, the response of the retinal in NM-R3 to photostimulation appears to be substantially different from that seen in bacteriorhodopsin.

SUBMITTER: Yun JH 

PROVIDER: S-EPMC7007266 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Pumping mechanism of NM-R3, a light-driven bacterial chloride importer in the rhodopsin family.

Yun Ji-Hye JH   Ohki Mio M   Park Jae-Hyun JH   Ishimoto Naito N   Sato-Tomita Ayana A   Lee Wonbin W   Jin Zeyu Z   Tame Jeremy R H JRH   Shibayama Naoya N   Park Sam-Yong SY   Lee Weontae W  

Science advances 20200207 6


A newly identified microbial rhodopsin, NM-R3, from the marine flavobacterium <i>Nonlabens marinus</i>, was recently shown to drive chloride ion uptake, extending our understanding of the diversity of mechanisms for biological energy conversion. To clarify the mechanism underlying its function, we characterized the crystal structures of NM-R3 in both the dark state and early intermediate photoexcited states produced by laser pulses of different intensities and temperatures. The displacement of c  ...[more]

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