Cryo-EM structure of a blue-shifted channelrhodopsin from Klebsormidium nitens.

ABSTRACT: Channelrhodopsins (ChRs) are light-gated ion channels and invaluable tools for optogenetic applications. Recent developments in multicolor optogenetics, in which different neurons are controlled by multiple colors of light simultaneously, have increased the demand for ChR mutants with more distant absorption wavelengths. Here we report the 2.7 Å-resolution cryo-electron microscopy structure of a ChR from Klebsormidium nitens (KnChR), which is one of the most blue-shifted ChRs. The structure elucidates the 6-s-cis configuration of the retinal chromophore, indicating its contribution to a distinctive blue shift in action spectra. The unique architecture of the C-terminal region reveals its role in the allosteric modulation of channel kinetics, enhancing our understanding of its functional dy

SUBMITTER: Wang YZ 

PROVIDER: S-EPMC12177036 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature