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-Structure paper
タイトル | Structural basis for no retinal binding in flotillin-associated rhodopsins. |
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ジャーナル・号・ページ | Structure, Year 2025 |
掲載日 | 2025年7月10日 |
![]() | Kirill Kovalev / Artem Stetsenko / Florian Trunk / Egor Marin / Jose M Haro-Moreno / Gerrit H U Lamm / Alexey Alekseev / Francisco Rodriguez-Valera / Thomas R Schneider / Josef Wachtveitl / Albert Guskov / ![]() ![]() ![]() |
PubMed 要旨 | Rhodopsins are light-sensitive membrane proteins capturing solar energy via a retinal cofactor covalently attached to a lysine residue. Several groups of rhodopsins lack the conserved lysine and ...Rhodopsins are light-sensitive membrane proteins capturing solar energy via a retinal cofactor covalently attached to a lysine residue. Several groups of rhodopsins lack the conserved lysine and showed no retinal binding. Recently, flotillin-associated rhodopsins (FArhodopsins or FARs) were identified and suggested to lack the retinal-binding pocket despite preserving the lysine residue in many members of the group. Here, we present cryoelectron microscopic (cryo-EM) structures of paralog FArhodopsin and proteorhodopsin from marine bacterium Pseudothioglobus, both forming pentamers similar to those of other microbial rhodopsins. We demonstrate no binding of retinal to the FArhodopsin despite preservation of the lysine residue and overall similarity of the protein fold and internal organization to those of the retinal-binding paralog. Mutational analysis confirmed that two amino acids, H84 and E120, prevent retinal binding within the FArhodopsin. Our work provides insights into the natural retinal loss in microbial rhodopsins and might contribute to the further understanding of FArhodopsins. |
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手法 | EM (単粒子) |
解像度 | 2.48 - 2.81 Å |
構造データ | EMDB-53519, PDB-9r21: EMDB-53520, PDB-9r22: EMDB-53521, PDB-9r23: |
化合物 | ![]() ChemComp-LFA: ![]() ChemComp-HOH: ![]() ChemComp-RET: ![]() ChemComp-LMT: |
由来 |
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![]() | MEMBRANE PROTEIN / flotillin / rhodopsin / retinal / proton transport / bioenergetics / proteorhodopsin / microbial rhodopsin |