+Open data
-Basic information
Entry | Database: PDB / ID: 8grn | ||||||
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Title | AtOSCA1.1 extended state | ||||||
Components | Protein OSCA1 | ||||||
Keywords | MEMBRANE PROTEIN / channel | ||||||
Function / homology | Function and homology information regulation of calcium ion import / calcium-activated cation channel activity / cellular hyperosmotic response / response to osmotic stress / monoatomic cation channel activity / protein tetramerization / plasma membrane / cytosol Similarity search - Function | ||||||
Biological species | Arabidopsis thaliana (thale cress) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.5 Å | ||||||
Authors | Zhang, M.F. | ||||||
Funding support | 1items
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Citation | Journal: Nat Commun / Year: 2023 Title: A mechanical-coupling mechanism in OSCA/TMEM63 channel mechanosensitivity. Authors: Mingfeng Zhang / Yuanyue Shan / Charles D Cox / Duanqing Pei / Abstract: Mechanosensitive (MS) ion channels are a ubiquitous type of molecular force sensor sensing forces from the surrounding bilayer. The profound structural diversity in these channels suggests that the ...Mechanosensitive (MS) ion channels are a ubiquitous type of molecular force sensor sensing forces from the surrounding bilayer. The profound structural diversity in these channels suggests that the molecular mechanisms of force sensing follow unique structural blueprints. Here we determine the structures of plant and mammalian OSCA/TMEM63 proteins, allowing us to identify essential elements for mechanotransduction and propose roles for putative bound lipids in OSCA/TMEM63 mechanosensation. Briefly, the central cavity created by the dimer interface couples each subunit and modulates dimeric OSCA/TMEM63 channel mechanosensitivity through the modulating lipids while the cytosolic side of the pore is gated by a plug lipid that prevents the ion permeation. Our results suggest that the gating mechanism of OSCA/TMEM63 channels may combine structural aspects of the 'lipid-gated' mechanism of MscS and TRAAK channels and the calcium-induced gating mechanism of the TMEM16 family, which may provide insights into the structural rearrangements of TMEM16/TMC superfamilies. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8grn.cif.gz | 264.5 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8grn.ent.gz | 212.4 KB | Display | PDB format |
PDBx/mmJSON format | 8grn.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 8grn_validation.pdf.gz | 1.5 MB | Display | wwPDB validaton report |
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Full document | 8grn_full_validation.pdf.gz | 1.6 MB | Display | |
Data in XML | 8grn_validation.xml.gz | 61.8 KB | Display | |
Data in CIF | 8grn_validation.cif.gz | 86.5 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/gr/8grn ftp://data.pdbj.org/pub/pdb/validation_reports/gr/8grn | HTTPS FTP |
-Related structure data
Related structure data | 34209MC 8groC 8grsC 8gsoC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: Protein | Mass: 87697.008 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Arabidopsis thaliana (thale cress) / Gene: OSCA1, OSCA1.1, At4g04340, T19B17.6 / Production host: Homo sapiens (human) / References: UniProt: Q9XEA1 #2: Chemical | Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: AtOSCA1.1 extended state / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: Arabidopsis (plant) |
Source (recombinant) | Organism: Homo sapiens (human) |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 2000 nm |
Image recording | Electron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
-Processing
CTF correction | Type: NONE |
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3D reconstruction | Resolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 838000 / Symmetry type: POINT |