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- EMDB-31491: Cryo-EM structure of the C-terminal deletion mutant of human PANX... -

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Basic information

Entry
Database: EMDB / ID: EMD-31491
TitleCryo-EM structure of the C-terminal deletion mutant of human PANX1 in a nanodisc
Map data
Sample
  • Complex: heptamar of human pannexin-1 channel in a nanodisc
    • Protein or peptide: Pannexin-1
  • Ligand: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
KeywordsATP release channel / vertebrate innexin homolog / TRANSPORT PROTEIN
Function / homology
Function and homology information


ATP transmembrane transporter activity / ATP transport / leak channel activity / Electric Transmission Across Gap Junctions / positive regulation of interleukin-1 alpha production / wide pore channel activity / bleb / monoatomic anion channel activity / monoatomic anion transmembrane transport / gap junction ...ATP transmembrane transporter activity / ATP transport / leak channel activity / Electric Transmission Across Gap Junctions / positive regulation of interleukin-1 alpha production / wide pore channel activity / bleb / 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
Pannexin / Innexin / Innexin / Pannexin family profile.
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsKuzuya M / Hirano H
Funding support Japan, 3 items
OrganizationGrant numberCountry
Japan Agency for Medical Research and Development (AMED)JP20ae0101051 Japan
Ministry of Education, Culture, Sports, Science and Technology (Japan)JP20H03165 Japan
New Energy and Industrial Technology Development Organization (NEDO)JP20am0101118 Japan
CitationJournal: Sci Signal / Year: 2022
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.
History
DepositionJul 2, 2021-
Header (metadata) releaseJan 26, 2022-
Map releaseJan 26, 2022-
UpdateNov 20, 2024-
Current statusNov 20, 2024Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.012
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.012
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7f8o
  • Surface level: 0.012
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_31491.png

Downloads & links

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Map

FileDownload / File: emd_31491.map.gz / Format: CCP4 / Size: 83.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.81 Å/pix.
x 280 pix.
= 226.8 Å		0.81 Å/pix.
x 280 pix.
= 226.8 Å		0.81 Å/pix.
x 280 pix.
= 226.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.81 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.01 / Movie #1: 0.012
Minimum - Maximum-0.068511 - 0.09940465
Average (Standard dev.)0.000049282586 (±0.0028944665)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions280280280
Spacing280280280
CellA=B=C: 226.8 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.810.810.81
M x/y/z280280280
origin x/y/z0.0000.0000.000
length x/y/z226.800226.800226.800
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS280280280
D min/max/mean-0.0690.0990.000

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Supplemental data

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Mask #1

Fileemd_31491_msk_1.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Half map: #2

Fileemd_31491_half_map_1.map
Projections & Slices
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Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_31491_half_map_2.map
Projections & Slices
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Sample components

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Entire : heptamar of human pannexin-1 channel in a nanodisc

EntireName: heptamar of human pannexin-1 channel in a nanodisc
Components
  • Complex: heptamar of human pannexin-1 channel in a nanodisc
    • Protein or peptide: Pannexin-1
  • Ligand: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine

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Supramolecule #1: heptamar of human pannexin-1 channel in a nanodisc

SupramoleculeName: heptamar of human pannexin-1 channel in a nanodisc / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Pannexin-1

MacromoleculeName: Pannexin-1 / type: protein_or_peptide / ID: 1 / Number of copies: 7 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 48.093863 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MAIAQLATEY VFSDFLLKEP TEPKFKGLRL ELAVDKMVTC IAVGLPLLLI SLAFAQEISI GTQISCFSPS SFSWRQAAFV DSYCWAAVQ QKNSLQSESG NLPLWLHKFF PYILLLFAIL LYLPPLFWRF AAAPHICSDL KFIMEELDKV YNRAIKAAKS A RDLDMRDG ...String:
MAIAQLATEY VFSDFLLKEP TEPKFKGLRL ELAVDKMVTC IAVGLPLLLI SLAFAQEISI GTQISCFSPS SFSWRQAAFV DSYCWAAVQ QKNSLQSESG NLPLWLHKFF PYILLLFAIL LYLPPLFWRF AAAPHICSDL KFIMEELDKV YNRAIKAAKS A RDLDMRDG ACSVPGVTEN LGQSLWEVSE SHFKYPIVEQ YLKTKKNSNN LIIKYISCRL LTLIIILLAC IYLGYYFSLS SL SDEFVCS IKSGILRNDS TVPDQFQCKL IAVGIFQLLS VINLVVYVLL APVVVYTLFV PFRQKTDVLK VYEILPTFDV LHF KSEGYN DLSLYNLFLE ENISEVKSYK CLKVLENIKS SGQGIDPMLL LTNLGMIKMD VVDGKTPMSA EMREEQGNQT AELQ GMNID SETKANNGEK NARQRLLDSS C

UniProtKB: Pannexin-1

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Macromolecule #2: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine

MacromoleculeName: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / type: ligand / ID: 2 / Number of copies: 21 / Formula: LBN
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-LBN:
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / phospholipid*YM

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration4.8 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
10.0 mMHEPES
300.0 mMNaClsodium chloride
GridModel: Quantifoil R2/2 / Material: MOLYBDENUM / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec.
VitrificationCryogen name: ETHANE / Instrument: LEICA KF80
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

MicroscopeJEOL CRYO ARM 300
Specialist opticsEnergy filter - Name: In-column Omega Filter / Energy filter - Slit width: 30 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Digitization - Dimensions - Width: 5760 pixel / Digitization - Dimensions - Height: 4092 pixel / Number grids imaged: 1 / Average exposure time: 2.4 sec. / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated defocus max: 5.0 µm / Calibrated defocus min: 0.5 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal magnification: 40000
Sample stageSpecimen holder model: JEOL / Cooling holder cryogen: NITROGEN

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Image processing

Particle selectionNumber selected: 1133305
Startup modelType of model: NONE
Final reconstructionNumber classes used: 1 / Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 31035
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL / Overall B value: 153.6
Output model

PDB-7f8o:
Cryo-EM structure of the C-terminal deletion mutant of human PANX1 in a nanodisc

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