Abstract
Opsins are universal photoreceptive proteins in animals. Vertebrate rhodopsin in ciliary photoreceptor cells photo-converts to a metastable active state to regulate cyclic nucleotide signaling. This active state cannot photo-convert back to the dark state, and thus vertebrate rhodopsin is categorized as a mono-stable opsin. By contrast, mollusk and arthropod rhodopsins in rhabdomeric photoreceptor cells photo-convert to a stable active state to stimulate IP3/calcium signaling. This active state can photo-convert back to the dark state, and thus these rhodopsins are categorized as bistable opsins. Moreover, the negatively charged counterion position crucial for the visible light sensitivity is different between vertebrate rhodopsin (Glu113) and mollusk and arthropod rhodopsins (Glu181). This can be explained by an evolutionary scenario where vertebrate rhodopsin newly acquired Glu113 as a counterion, which is thought to have led to higher signaling efficiency of vertebrate rhodopsin. However, the detailed evolutionary steps which led to the higher efficiency in vertebrate rhodopsin still remain unknown. Here, we analyzed the xenopsin group, which is phylogenetically distinct from vertebrate rhodopsin and functions in protostome ciliary cells. Xenopsins are blue-sensitive bistable opsins that regulate cAMP signaling. We found that a bistable xenopsin of Leptochiton asellus had Glu113 as a counterion but did not exhibit elevated signaling efficiency. Therefore, our results show that vertebrate rhodopsin and L. asellus xenopsin regulate cyclic nucleotide signaling in ciliary cells and displaced the counterion position from Glu181 to Glu113 via convergent evolution, whereas subsequently only vertebrate rhodopsin elevated its signaling efficiency by acquiring the mono-stable property.
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Acknowledgements
We thank Dr. Elizabeth Nakajima for a critical reading of the manuscript and Dr. Keita Sato for technical advice for the cAMP assay and the Ca2+ assay. We also thank Prof. Robert. S. Molday for the generous gift of a Rho1D4-producing hybridoma.
Funding
This work was supported in part by CREST, JST JPMJCR1753 (T.Y.), a grant from the Kyoto University Foundation (T.Y.) and a grant from the Takeda Science Foundation (T.Y.).
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TY designed research; KS, HI, CF and TY performed research; KS, HI, CF, YI and TY analyzed data; TY wrote the manuscript with editing by all authors.
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Sakai, K., Ikeuchi, H., Fujiyabu, C. et al. Convergent evolutionary counterion displacement of bilaterian opsins in ciliary cells. Cell. Mol. Life Sci. 79, 493 (2022). https://doi.org/10.1007/s00018-022-04525-6
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DOI: https://doi.org/10.1007/s00018-022-04525-6