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- EMDB-22979: Alpha-7 nicotinic acetylcholine receptor bound to alpha-bungaroto... -

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Basic information

Entry
Database: EMDB / ID: EMD-22979
TitleAlpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in a resting state.
Map dataAlpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in a resting state primary map
Sample
  • Complex: Complex between alpha-bungarotoxin and the human alpha-7 nicotinic acetylcholine receptor
    • Complex: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 fusion
      • Protein or peptide: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 fusion
    • Complex: Alpha-bungarotoxin isoform V31
      • Protein or peptide: Alpha-bungarotoxin isoform V31
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CALCIUM ION
KeywordsCys-loop receptor / MEMBRANE PROTEIN
Function / homology
Function and homology information


sensory processing / dendrite arborization / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / response to acetylcholine / acetylcholine-gated channel complex / acetylcholine-gated monoatomic cation-selective channel activity / regulation of amyloid fibril formation / short-term memory / acetylcholine receptor inhibitor activity ...sensory processing / dendrite arborization / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / response to acetylcholine / acetylcholine-gated channel complex / acetylcholine-gated monoatomic cation-selective channel activity / regulation of amyloid fibril formation / short-term memory / acetylcholine receptor inhibitor activity / positive regulation of CoA-transferase activity / ion channel regulator activity / dendritic spine organization / acetylcholine binding / chloride channel regulator activity / regulation of amyloid precursor protein catabolic process / acetylcholine receptor signaling pathway / positive regulation of amyloid-beta formation / negative regulation of amyloid-beta formation / plasma membrane raft / modulation of excitatory postsynaptic potential / response to amyloid-beta / monoatomic ion channel activity / negative regulation of tumor necrosis factor production / positive regulation of excitatory postsynaptic potential / toxic substance binding / monoatomic ion transport / positive regulation of protein metabolic process / positive regulation of long-term synaptic potentiation / response to nicotine / electron transport chain / synapse organization / calcium channel activity / memory / cognition / intracellular calcium ion homeostasis / positive regulation of angiogenesis / calcium ion transport / amyloid-beta binding / toxin activity / monoatomic ion transmembrane transport / postsynaptic membrane / postsynapse / positive regulation of MAPK cascade / periplasmic space / electron transfer activity / positive regulation of ERK1 and ERK2 cascade / learning or memory / response to hypoxia / neuron projection / iron ion binding / positive regulation of protein phosphorylation / heme binding / positive regulation of cell population proliferation / synapse / signal transduction / protein homodimerization activity / extracellular region / membrane / plasma membrane
Similarity search - Function
Snake three-finger toxin / Snake toxin, conserved site / Snake toxins signature. / : / Snake toxin cobra-type / Nicotinic acetylcholine receptor / Snake toxin-like superfamily / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain ...Snake three-finger toxin / Snake toxin, conserved site / Snake toxins signature. / : / Snake toxin cobra-type / Nicotinic acetylcholine receptor / Snake toxin-like superfamily / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Neurotransmitter-gated ion-channel / Neurotransmitter-gated ion-channel ligand-binding domain / Neurotransmitter-gated ion-channel ligand-binding domain superfamily / Neurotransmitter-gated ion-channel ligand binding domain
Similarity search - Domain/homology
Soluble cytochrome b562 / Neuronal acetylcholine receptor subunit alpha-7 / Alpha-bungarotoxin isoform V31
Similarity search - Component
Biological speciesHomo sapiens (human) / Bungarus multicinctus (many-banded krait)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsNoviello CM / Hibbs RE
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)NS095899 United States
National Institutes of Health/National Institute of Mental Health (NIH/NIMH)NS077983 United States
CitationJournal: Cell / Year: 2021
Title: Structure and gating mechanism of the α7 nicotinic acetylcholine receptor.
Authors: Colleen M Noviello / Anant Gharpure / Nuriya Mukhtasimova / Rico Cabuco / Leah Baxter / Dominika Borek / Steven M Sine / Ryan E Hibbs /
Abstract: The α7 nicotinic acetylcholine receptor plays critical roles in the central nervous system and in the cholinergic inflammatory pathway. This ligand-gated ion channel assembles as a homopentamer, is ...The α7 nicotinic acetylcholine receptor plays critical roles in the central nervous system and in the cholinergic inflammatory pathway. This ligand-gated ion channel assembles as a homopentamer, is exceptionally permeable to Ca, and desensitizes faster than any other Cys-loop receptor. The α7 receptor has served as a prototype for the Cys-loop superfamily yet has proven refractory to structural analysis. We present cryo-EM structures of the human α7 nicotinic receptor in a lipidic environment in resting, activated, and desensitized states, illuminating the principal steps in the gating cycle. The structures also reveal elements that contribute to its function, including a C-terminal latch that is permissive for channel opening, and an anionic ring in the extracellular vestibule that contributes to its high conductance and calcium permeability. Comparisons among the α7 structures provide a foundation for mapping the gating cycle and reveal divergence in gating mechanisms in the Cys-loop receptor superfamily.
History
DepositionNov 9, 2020-
Header (metadata) releaseMar 17, 2021-
Map releaseMar 17, 2021-
UpdateNov 6, 2024-
Current statusNov 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7koo
  • Surface level: 0.025
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_22979.png

Downloads & links

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Map

FileDownload / File: emd_22979.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationAlpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in a resting state primary map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 256 pix.
= 276.224 Å		1.08 Å/pix.
x 256 pix.
= 276.224 Å		1.08 Å/pix.
x 256 pix.
= 276.224 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.079 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0132 / Movie #1: 0.025
Minimum - Maximum-0.12901723 - 0.2264349
Average (Standard dev.)0.00037004022 (±0.0051400177)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 276.224 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0791.0791.079
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z276.224276.224276.224
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ496496496
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.1290.2260.000

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Supplemental data

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Additional map: Alpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in...

Fileemd_22979_additional_1.map
AnnotationAlpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in a resting state additional map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Alpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in...

Fileemd_22979_half_map_1.map
AnnotationAlpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in a resting state half map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Alpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in...

Fileemd_22979_half_map_2.map
AnnotationAlpha-7 nicotinic acetylcholine receptor bound to alpha-bungarotoxin in a resting state half map 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Complex between alpha-bungarotoxin and the human alpha-7 nicotini...

EntireName: Complex between alpha-bungarotoxin and the human alpha-7 nicotinic acetylcholine receptor
Components
  • Complex: Complex between alpha-bungarotoxin and the human alpha-7 nicotinic acetylcholine receptor
    • Complex: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 fusion
      • Protein or peptide: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 fusion
    • Complex: Alpha-bungarotoxin isoform V31
      • Protein or peptide: Alpha-bungarotoxin isoform V31
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: CALCIUM ION

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Supramolecule #1: Complex between alpha-bungarotoxin and the human alpha-7 nicotini...

SupramoleculeName: Complex between alpha-bungarotoxin and the human alpha-7 nicotinic acetylcholine receptor
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2

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Supramolecule #2: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrom...

SupramoleculeName: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 fusion
type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Alpha-bungarotoxin isoform V31

SupramoleculeName: Alpha-bungarotoxin isoform V31 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2

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Macromolecule #1: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrom...

MacromoleculeName: Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 fusion
type: protein_or_peptide / ID: 1 / Number of copies: 5 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 63.832293 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: EFQRKLYKEL VKNYNPLERP VANDSQPLTV YFSLSLLQIM DVDEKNQVLT TNIWLQMSWT DHYLQWNVSE YPGVKTVRFP DGQIWKPDI LLYNSADERF DATFHTNVLV NSSGHCQYLP PGIFKSSCYI DVRWFPFDVQ HCKLKFGSWS YGGWSLDLQM Q EADISGYI ...String:
EFQRKLYKEL VKNYNPLERP VANDSQPLTV YFSLSLLQIM DVDEKNQVLT TNIWLQMSWT DHYLQWNVSE YPGVKTVRFP DGQIWKPDI LLYNSADERF DATFHTNVLV NSSGHCQYLP PGIFKSSCYI DVRWFPFDVQ HCKLKFGSWS YGGWSLDLQM Q EADISGYI PNGEWDLVGI PGKRSERFYE CCKEPYPDVT FTVTMRRRTL YYGLNLLIPC VLISALALLV FLLPADSGEK IS LGITVLL SLTVFMLLVA EIMPATSDSV PLIAQYFAST MIIVGLSVVV TVIVLQYHHH DPDGGKMPKW TRVILLNWCA WFL RMKRPG EDKVRPACQH KQRRCSLASV EMAGAMADLE DNWETLNDNL KVIEKADNAA QVKDALTKMR AAALDAQKAT PPKL EDKSP DSPEMKDFRH GFDILVGQID DALKLANEGK VKEAQAAAEQ LKTTRNAYIQ KYLCGRMACS PTHDEHLLHG GQPPE GDPD LAKILEEVRY IANRFRCQDE SEAVCSEWKF AACVVDRLCL MAFSVFTIIC TIGILMSAPN FVEAVSKDFA WSHPQF EK

UniProtKB: Neuronal acetylcholine receptor subunit alpha-7, Soluble cytochrome b562, Neuronal acetylcholine receptor subunit alpha-7

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Macromolecule #2: Alpha-bungarotoxin isoform V31

MacromoleculeName: Alpha-bungarotoxin isoform V31 / type: protein_or_peptide / ID: 2 / Number of copies: 5 / Enantiomer: LEVO
Source (natural)Organism: Bungarus multicinctus (many-banded krait)
Molecular weightTheoretical: 7.721973 KDa
SequenceString:
IVCHTTATSP ISAVTCPPGE NLCYRKMWCD VFCSSRGKVV ELGCAATCPS KKPYEEVTCC STDKCNPHPK Q

UniProtKB: Alpha-bungarotoxin isoform V31

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Macromolecule #5: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 5 / Number of copies: 5 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #6: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 6 / Number of copies: 5 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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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

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 61.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 792521
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD

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