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Structural basis for no retinal binding in flotillin-associated rhodopsins.

Kirill Kovalev1, Artem Stetsenko2, Florian Trunk3

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|July 12, 2025
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Summary

Flotillin-associated rhodopsins (FARs) are light-sensitive proteins. Researchers found that despite having a key lysine, FARs do not bind retinal due to specific amino acids, explaining natural retinal loss.

Keywords:
cryoelectron microscopyflotillinion transportmembranesphotocycleproteorhodopsinretinalrhodopsinspectroscopytime-resolved spectroscopy

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A Rhodopsin Transport Assay by High-Content Imaging Analysis
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Area of Science:

  • Membrane protein structural biology
  • Microbial rhodopsin research
  • Biochemistry of light-harvesting systems

Background:

  • Rhodopsins are light-sensitive proteins utilizing a retinal cofactor.
  • Some rhodopsins lack the conserved lysine essential for retinal binding.
  • Flotillin-associated rhodopsins (FARs) were recently identified, with many retaining the lysine but lacking retinal-binding pockets.

Purpose of the Study:

  • To elucidate the structural basis for the lack of retinal binding in flotillin-associated rhodopsins (FARs).
  • To investigate the structural characteristics of FARs compared to retinal-binding rhodopsins.
  • To understand the mechanisms behind natural retinal loss in microbial rhodopsins.

Main Methods:

  • Cryoelectron microscopy (cryo-EM) to determine the structures of FArhodopsin and proteorhodopsin.
  • Biochemical assays to assess retinal binding.
  • Site-directed mutagenesis to identify key residues involved in retinal binding.

Main Results:

  • Cryo-EM structures revealed that FArhodopsins and proteorhodopsins form pentamers, similar to other microbial rhodopsins.
  • FArhodopsin demonstrated no retinal binding, despite the presence of the conserved lysine residue.
  • Mutational analysis identified specific amino acids (H84 and E120) in FArhodopsin that prevent retinal binding.

Conclusions:

  • The study provides structural insights into how FARs have lost the ability to bind retinal, even with the lysine residue present.
  • Specific amino acid substitutions are responsible for the absence of retinal in FArhodopsins.
  • This research contributes to understanding the evolutionary diversity and functional adaptation of microbial rhodopsins.