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Open data
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Basic information
Entry | Database: PDB / ID: 7f8j | ||||||
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Title | Cryo-EM structure of human pannexin-1 in a nanodisc | ||||||
![]() | Pannexin-1 | ||||||
![]() | TRANSPORT PROTEIN / ATP release channel / vertebrate innexin homolog | ||||||
Function / homology | ![]() ATP transmembrane transporter activity / ATP transport / Electric Transmission Across Gap Junctions / leak channel activity / positive regulation of interleukin-1 alpha production / bleb / wide pore channel activity / monoatomic anion channel activity / monoatomic anion transmembrane transport / gap junction ...ATP transmembrane transporter activity / ATP transport / Electric Transmission Across Gap Junctions / leak channel activity / positive regulation of interleukin-1 alpha production / bleb / wide pore channel activity / monoatomic anion channel activity / monoatomic anion transmembrane transport / gap junction / gap junction channel activity / positive regulation of macrophage cytokine production / response to ATP / oogenesis / monoatomic cation transport / The NLRP3 inflammasome / positive regulation of interleukin-1 beta production / response to ischemia / calcium channel activity / calcium ion transport / actin filament binding / cell-cell signaling / scaffold protein binding / protease binding / transmembrane transporter binding / signaling receptor binding / endoplasmic reticulum membrane / structural molecule activity / endoplasmic reticulum / protein-containing complex / identical protein binding / membrane / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å | ||||||
![]() | Kuzuya, M. / Hirano, H. / Hayashida, K. / Watanabe, M. / Kobayashi, K. / Tani, K. / Fujiyoshi, Y. / Oshima, A. | ||||||
![]() | ![]() Title: Structures of human pannexin-1 in nanodiscs reveal gating mediated by dynamic movement of the N terminus and phospholipids. Authors: Maki Kuzuya / Hidemi Hirano / Kenichi Hayashida / Masakatsu Watanabe / Kazumi Kobayashi / Tohru Terada / Md Iqbal Mahmood / Florence Tama / Kazutoshi Tani / Yoshinori Fujiyoshi / Atsunori Oshima / ![]() Abstract: Pannexin (PANX) family proteins form large-pore channels that mediate purinergic signaling. We analyzed the cryo-EM structures of human PANX1 in lipid nanodiscs to elucidate the gating mechanism and ...Pannexin (PANX) family proteins form large-pore channels that mediate purinergic signaling. We analyzed the cryo-EM structures of human PANX1 in lipid nanodiscs to elucidate the gating mechanism and its regulation by the amino terminus in phospholipids. The wild-type channel has an amino-terminal funnel in the pore, but in the presence of the inhibitor probenecid, a cytoplasmically oriented amino terminus and phospholipids obstruct the pore. Functional analysis using whole-cell patch-clamp and oocyte voltage clamp showed that PANX1 lacking the amino terminus did not open and had a dominant negative effect on channel activity, thus confirming that the amino-terminal domain played an essential role in channel opening. These observations suggest that dynamic conformational changes in the amino terminus of human PANX1 are associated with lipid movement in and out of the pore. Moreover, the data provide insight into the gating mechanism of PANX1 and, more broadly, other large-pore channels. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 421 KB | Display | ![]() |
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PDB format | ![]() | 353.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 31489MC ![]() 7f8nC ![]() 7f8oC ![]() 7wsvC M: map data used to model this data C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data #1: human WT PANX1 in nanodisc [micrographs - multiframe]) |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 48093.863 Da / Num. of mol.: 7 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #2: Chemical | ChemComp-LBN / Has ligand of interest | N | |
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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 |
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Sample preparation
Component | Name: heptamar of human pannexin-1 channel in a nanodisc / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT | |||||||||||||||
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Molecular weight | Experimental value: NO | |||||||||||||||
Source (natural) | Organism: ![]() | |||||||||||||||
Source (recombinant) | Organism: ![]() | |||||||||||||||
Buffer solution | pH: 7.5 | |||||||||||||||
Buffer component |
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Specimen | Conc.: 4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||
Specimen support | Grid material: MOLYBDENUM / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/2 | |||||||||||||||
Vitrification | Instrument: LEICA KF80 / Cryogen name: ETHANE Details: blot for 10 seconds at room temperature followed by plunge freezing. Because of manual blotting, humidity and temperature in a room is not controlled. |
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Electron microscopy imaging
Microscopy | Model: JEOL CRYO ARM 300 |
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Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 40000 X / Calibrated defocus min: 500 nm / Calibrated defocus max: 5000 nm / Cs: 2.7 mm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: JEOL |
Image recording | Average exposure time: 2.6 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2817 |
EM imaging optics | Energyfilter name: In-column Omega Filter / Energyfilter slit width: 30 eV |
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Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | |||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING ONLY | |||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1533798 | |||||||||||||||||||||||||
3D reconstruction | Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 55718 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT | |||||||||||||||||||||||||
Atomic model building | B value: 146.5 / Protocol: AB INITIO MODEL / Space: REAL | |||||||||||||||||||||||||
Refine LS restraints |
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