EIPOD fellowship under Marie Sklodowska-Curie Actions COFUND
847543
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ジャーナル: Sci Adv / 年: 2025 タイトル: CryoRhodopsins: A comprehensive characterization of a group of microbial rhodopsins from cold environments. 著者: Gerrit H U Lamm / Egor Marin / Alexey Alekseev / Anna V Schellbach / Artem Stetsenko / Jose Manuel Haro-Moreno / Gleb Bourenkov / Valentin Borshchevskiy / Marvin Asido / Michael Agthe / ...著者: Gerrit H U Lamm / Egor Marin / Alexey Alekseev / Anna V Schellbach / Artem Stetsenko / Jose Manuel Haro-Moreno / Gleb Bourenkov / Valentin Borshchevskiy / Marvin Asido / Michael Agthe / Sylvain Engilberge / Samuel L Rose / Nicolas Caramello / Antoine Royant / Thomas R Schneider / Alex Bateman / Thomas Mager / Tobias Moser / Francisco Rodriguez-Valera / Josef Wachtveitl / Albert Guskov / Kirill Kovalev / 要旨: Microbial rhodopsins are omnipresent on Earth; however, the vast majority of them remain uncharacterized. Here, we describe a rhodopsin group found in microorganisms from cold environments, such as ...Microbial rhodopsins are omnipresent on Earth; however, the vast majority of them remain uncharacterized. Here, we describe a rhodopsin group found in microorganisms from cold environments, such as glaciers, denoted as CryoRhodopsins (CryoRs). A distinguishing feature of the group is the presence of a buried arginine residue close to the cytoplasmic face. Combining single-particle cryo-electron microscopy and x-ray crystallography with rhodopsin activation by light, we demonstrate that the arginine stabilizes an ultraviolet (UV)-absorbing intermediate of an extremely slow CryoRhodopsin photocycle. Together with extensive spectroscopic characterization, our investigations on CryoR1 and CryoR2 proteins reveal mechanisms of photoswitching in the identified group. Our data suggest that CryoRs are sensors for UV irradiation and are also capable of inward proton translocation modulated by UV light.