Crystal structure and functional characterization of a light-driven chloride pump having an NTQ motif

Kuglae Kim, Soon Kyeong Kwon, Sung Hoon Jun, Jeong Seok Cha, Hoyoung Kim, Weontae Lee, Jihyun F. Kim, Hyun Soo Cho

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

A novel light-driven chloride-pumping rhodopsin (ClR) containing an NTQ motif' in its putative ion conduction pathway has been discovered and functionally characterized in a genomic analysis study of a marine bacterium. Here we report the crystal structure of ClR from the flavobacterium Nonlabens marinus S1-08 T determined under two conditions at 2.0 and 1.56 Å resolutions. The structures reveal two chloride-binding sites, one around the protonated Schiff base and the other on a cytoplasmic loop. We identify a 3 omega motif' formed by three non-consecutive aromatic amino acids that is correlated with the B-C loop orientation. Detailed ClR structural analyses with functional studies in E. coli reveal the chloride ion transduction pathway. Our results help understand the molecular mechanism and physiological role of ClR and provide a structural basis for optogenetic applications.

Original languageEnglish
Article number12677
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Aug 24

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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