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- PDB-9viq: human alpha 7 nicotinic acetylcholine receptor L277A mutant in co... -

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Basic information

Entry
Database: PDB / ID: 9viq
Titlehuman alpha 7 nicotinic acetylcholine receptor L277A mutant in complex with L-nicotine (desensitized state)
ComponentsNeuronal acetylcholine receptor subunit alpha-7
KeywordsMEMBRANE PROTEIN / Ligand-gated ion channel / Nicotine / Desensitization / Recovery / Closed pore / mutant
Function / homology
Function and homology information


sensory processing / synaptic transmission involved in micturition / dendrite arborization / response to acetylcholine / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / acetylcholine-gated channel complex / regulation of amyloid fibril formation / acetylcholine-gated monoatomic cation-selective channel activity / short-term memory ...sensory processing / synaptic transmission involved in micturition / dendrite arborization / response to acetylcholine / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / acetylcholine-gated channel complex / regulation of amyloid fibril formation / acetylcholine-gated monoatomic cation-selective channel activity / short-term memory / cation channel complex / dendritic spine organization / chloride channel regulator activity / acetylcholine binding / regulation of amyloid precursor protein catabolic process / acetylcholine receptor signaling pathway / neurotransmitter receptor complex / positive regulation of amyloid-beta formation / positive regulation of protein metabolic process / negative regulation of amyloid-beta formation / response to amyloid-beta / ligand-gated ion channel signaling pathway / monoatomic ion channel activity / modulation of excitatory postsynaptic potential / plasma membrane raft / negative regulation of tumor necrosis factor production / positive regulation of excitatory postsynaptic potential / toxic substance binding / monoatomic ion transport / negative regulation of canonical NF-kappaB signal transduction / negative regulation of cytokine production involved in inflammatory response / positive regulation of long-term synaptic potentiation / regulation of membrane potential / excitatory postsynaptic potential / response to nicotine / synapse organization / calcium channel activity / cognition / memory / intracellular calcium ion homeostasis / positive regulation of angiogenesis / calcium ion transport / transmembrane signaling receptor activity / amyloid-beta binding / monoatomic ion transmembrane transport / chemical synaptic transmission / postsynaptic membrane / learning or memory / response to hypoxia / positive regulation of ERK1 and ERK2 cascade / postsynapse / neuron projection / positive regulation of MAPK cascade / positive regulation of cell population proliferation / dendrite / synapse / endoplasmic reticulum membrane / signal transduction / protein homodimerization activity / membrane / plasma membrane
Similarity search - Function
Nicotinic acetylcholine receptor / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / 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
(S)-3-(1-METHYLPYRROLIDIN-2-YL)PYRIDINE / Neuronal acetylcholine receptor subunit alpha-7
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.24 Å
AuthorsLiu, S. / Chen, H. / Tian, C.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: To Be Published
Title: Structural insights into the progressive recovery of alpha7 nicotinic acetylcholine receptor from nicotine-induced desensitization
Authors: Liu, S. / Chen, H. / Zhu, X. / Ye, F. / Zhao, Y. / Qin, J. / Zheng, Y. / Wang, X. / Zhang, L. / Chen, H. / Li, X. / Mu, W. / Luo, C. / Hou, H. / Bai, C. / Liu, L. / Tian, C.
History
DepositionJun 19, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Sep 10, 2025Provider: repository / Type: Initial release
Revision 1.0Sep 10, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Sep 10, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Sep 10, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Sep 10, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Sep 10, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Sep 10, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Neuronal acetylcholine receptor subunit alpha-7
B: Neuronal acetylcholine receptor subunit alpha-7
C: Neuronal acetylcholine receptor subunit alpha-7
D: Neuronal acetylcholine receptor subunit alpha-7
E: Neuronal acetylcholine receptor subunit alpha-7
hetero molecules


Theoretical massNumber of molelcules
Total (without water)291,91020
Polymers287,8715
Non-polymers4,03915
Water905
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Neuronal acetylcholine receptor subunit alpha-7 / nAChR7 / Nicotinic acetylcholine receptor subunit alpha-7


Mass: 57574.172 Da / Num. of mol.: 5 / Mutation: L277A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CHRNA7, NACHRA7 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P36544
#2: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#3: Chemical
ChemComp-NCT / (S)-3-(1-METHYLPYRROLIDIN-2-YL)PYRIDINE / (S)-(-)-NICOTINE / 3-[(2S)-1-METHYL-2-PYRROLIDINYL] PYRIDINE


Mass: 162.232 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C10H14N2 / Feature type: SUBJECT OF INVESTIGATION
#4: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 5 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: human alpha 7 nicotinic acetylcholine receptor L277A mutant in complex with L-nicotine
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1400 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 55 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.24 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 7997 / Symmetry type: POINT
RefinementCross valid method: NONE

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