+検索条件
-Structure paper
| タイトル | Structural insights into light-gating of potassium-selective channelrhodopsin. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 1283, Year 2025 |
| 掲載日 | 2025年2月3日 |
著者 | Takefumi Morizumi / Kyumhyuk Kim / Hai Li / Probal Nag / Tal Dogon / Oleg A Sineshchekov / Yumei Wang / Leonid S Brown / Songhwan Hwang / Han Sun / Ana-Nicoleta Bondar / Igor Schapiro / Elena G Govorunova / John L Spudich / Oliver P Ernst / ![]() |
| PubMed 要旨 | Structural information on channelrhodopsins' mechanism of light-gated ion conductance is scarce, limiting its engineering as optogenetic tools. Here, we use single-particle cryo-electron microscopy ...Structural information on channelrhodopsins' mechanism of light-gated ion conductance is scarce, limiting its engineering as optogenetic tools. Here, we use single-particle cryo-electron microscopy of peptidisc-incorporated protein samples to determine the structures of the slow-cycling mutant C110A of kalium channelrhodopsin 1 from Hyphochytrium catenoides (HcKCR1) in the dark and upon laser flash excitation. Upon photoisomerization of the retinal chromophore, the retinylidene Schiff base NH-bond reorients from the extracellular to the cytoplasmic side. This switch triggers a series of side chain reorientations and merges intramolecular cavities into a transmembrane K conduction pathway. Molecular dynamics simulations confirm K flux through the illuminated state but not through the resting state. The overall displacement between the closed and the open structure is small, involving mainly side chain rearrangements. Asp105 and Asp116 play a key role in K conductance. Structure-guided mutagenesis and patch-clamp analysis reveal the roles of the pathway-forming residues in channel gating and selectivity. |
リンク | Nat Commun / PubMed:39900567 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.05 - 3.44 Å |
| 構造データ | EMDB-45467, PDB-9cdc: EMDB-45468, PDB-9cdd: EMDB-45469, PDB-9cde: |
| 化合物 | ![]() ChemComp-RET: ![]() ChemComp-CLR: ![]() ChemComp-PEE: ![]() ChemComp-HOH: |
| 由来 |
|
キーワード | MEMBRANE PROTEIN / Retinal Protein / Channelrhodopsin / Cation Channel / Peptidisc / Optogenetics / Transport Protein |
ムービー
コントローラー
構造ビューア
万見文献について



著者

リンク









hyphochytrium catenoides (真核生物)
キーワード