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- PDB-8st2: The 3alpha2beta stoichiometry of human alpha4beta2 nicotinic acet... -

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Basic information

Entry
Database: PDB / ID: 8st2
TitleThe 3alpha2beta stoichiometry of human alpha4beta2 nicotinic acetylcholine receptor in complex with acetylcholine
Components
  • (Neuronal acetylcholine receptor subunit ...) x 2
  • IgG1 Heavy Chain
  • IgG1 Kappa Light Chain
KeywordsTRANSPORT PROTEIN / cys-loop ligand-gated pentameric ion channels / cation-selective channel / acetylcholine
Function / homology
Function and homology information


vestibulocochlear nerve development / lateral geniculate nucleus development / regulation of circadian sleep/wake cycle, REM sleep / regulation of synaptic transmission, dopaminergic / synaptic transmission involved in micturition / quaternary ammonium group binding / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / optic nerve morphogenesis / central nervous system projection neuron axonogenesis ...vestibulocochlear nerve development / lateral geniculate nucleus development / regulation of circadian sleep/wake cycle, REM sleep / regulation of synaptic transmission, dopaminergic / synaptic transmission involved in micturition / quaternary ammonium group binding / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / optic nerve morphogenesis / central nervous system projection neuron axonogenesis / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / response to acetylcholine / cholinergic synapse / acetylcholine-gated channel complex / positive regulation of dopamine secretion / regulation of dopamine metabolic process / negative regulation of action potential / behavioral response to nicotine / acetylcholine-gated monoatomic cation-selective channel activity / inhibitory postsynaptic potential / nervous system process / acetylcholine binding / synaptic transmission, cholinergic / acetylcholine receptor signaling pathway / postsynaptic specialization membrane / regulation of synapse assembly / regulation of dendrite morphogenesis / heterocyclic compound binding / regulation of dopamine secretion / plasma membrane raft / action potential / B cell activation / associative learning / membrane depolarization / social behavior / ligand-gated monoatomic ion channel activity / smooth muscle contraction / monoatomic ion transport / positive regulation of B cell proliferation / sensory perception of pain / visual perception / regulation of membrane potential / learning / response to cocaine / locomotory behavior / response to nicotine / sensory perception of sound / visual learning / memory / cognition / calcium ion transport / presynaptic membrane / chemical synaptic transmission / postsynaptic membrane / response to ethanol / response to oxidative stress / response to hypoxia / neuron projection / external side of plasma membrane / DNA repair / neuronal cell body / dendrite / synapse / protein-containing complex binding / signal transduction / 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
ACETYLCHOLINE / Neuronal acetylcholine receptor subunit beta-2 / Neuronal acetylcholine receptor subunit alpha-4
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.94 Å
AuthorsKang, G. / Hibbs, R.E.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)DA047848 United States
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)DA042072 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS120496 United States
CitationJournal: Br J Pharmacol / Year: 2024
Title: Structural bases for stoichiometry-selective calcium potentiation of a neuronal nicotinic receptor.
Authors: Simone Mazzaferro / Guipeun Kang / Kathiresan Natarajan / Ryan E Hibbs / Steven M Sine /
Abstract: BACKGROUND AND PURPOSE: α4β2 nicotinic acetylcholine (nACh) receptors assemble in two stoichiometric forms, one of which is potentiated by calcium. The sites of calcium binding that underpin potentiation are not known.
EXPERIMENTAL APPROACH: To identify calcium binding sites, we applied cryo-electron microscopy (cryo-EM) and molecular dynamics (MD) simulations to each stoichiometric form of the α4β2 nACh receptor ...EXPERIMENTAL APPROACH: To identify calcium binding sites, we applied cryo-electron microscopy (cryo-EM) and molecular dynamics (MD) simulations to each stoichiometric form of the α4β2 nACh receptor in the presence of calcium ions. To test whether the identified calcium sites are linked to potentiation, we generated mutants of anionic residues at the sites, expressed wild type and mutant receptors in clonal mammalian fibroblasts, and recorded ACh-elicited single-channel currents with or without calcium.
KEY RESULTS: Both cryo-EM and MD simulations show calcium bound to a site between the extracellular and transmembrane domains of each α4 subunit (ECD-TMD site). Substituting alanine for anionic ...KEY RESULTS: Both cryo-EM and MD simulations show calcium bound to a site between the extracellular and transmembrane domains of each α4 subunit (ECD-TMD site). Substituting alanine for anionic residues at the ECD-TMD site abolishes stoichiometry-selective calcium potentiation, as monitored by single-channel patch clamp electrophysiology. Additionally, MD simulation reveals calcium association at subunit interfaces within the extracellular domain. Substituting alanine for anionic residues at the ECD sites reduces or abolishes stoichiometry-selective calcium potentiation.
CONCLUSIONS AND IMPLICATIONS: Stoichiometry-selective calcium potentiation of the α4β2 nACh receptor is achieved by calcium association with topographically distinct sites framed by anionic ...CONCLUSIONS AND IMPLICATIONS: Stoichiometry-selective calcium potentiation of the α4β2 nACh receptor is achieved by calcium association with topographically distinct sites framed by anionic residues within the α4 subunit and between the α4 and β2 subunits. Stoichiometry-selective calcium potentiation could result from the greater number of calcium sites in the stoichiometric form with three rather than two α4 subunits. The results are relevant to modulation of signalling via α4β2 nACh receptors in physiological and pathophysiological conditions.
History
DepositionMay 9, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 7, 2024Provider: repository / Type: Initial release
Revision 1.1Aug 21, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update
Revision 1.2Nov 13, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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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-4
B: Neuronal acetylcholine receptor subunit alpha-4
C: Neuronal acetylcholine receptor subunit beta-2
D: Neuronal acetylcholine receptor subunit alpha-4
E: Neuronal acetylcholine receptor subunit beta-2
F: IgG1 Kappa Light Chain
G: IgG1 Heavy Chain
J: IgG1 Kappa Light Chain
K: IgG1 Heavy Chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)386,85924
Polymers383,2339
Non-polymers3,62615
Water1448
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Neuronal acetylcholine receptor subunit ... , 2 types, 5 molecules ABDCE

#1: Protein Neuronal acetylcholine receptor subunit alpha-4


Mass: 44862.367 Da / Num. of mol.: 3 / Fragment: UNP residues 27-364,582-627
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CHRNA4, NACRA4 / Production host: Homo sapiens (human) / References: UniProt: P43681
#2: Protein Neuronal acetylcholine receptor subunit beta-2


Mass: 46748.863 Da / Num. of mol.: 2 / Fragment: UNP residues 26-355,442-502
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CHRNB2 / Production host: Homo sapiens (human) / References: UniProt: P17787

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Antibody , 2 types, 4 molecules FJGK

#3: Antibody IgG1 Kappa Light Chain


Mass: 26378.596 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse)
#4: Antibody IgG1 Heavy Chain


Mass: 51195.668 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse)

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Sugars , 2 types, 11 molecules

#5: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}}LINUCSPDB-CARE
#6: 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.: 9 / 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

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Non-polymers , 3 types, 12 molecules

#7: Chemical ChemComp-ACH / ACETYLCHOLINE


Mass: 146.207 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C7H16NO2 / Feature type: SUBJECT OF INVESTIGATION / Comment: neurotransmitter*YM
#8: Chemical ChemComp-NA / SODIUM ION


Mass: 22.990 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Na
#9: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 8 / Source method: isolated from a natural source / Formula: H2O

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Details

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: A complex of two Fab fragments with the 3alpha2beta stoichiometry of human alpha4beta2 nicotinic receptor bound to acetylcholine
Type: COMPLEX / Entity ID: #1-#4 / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE / Humidity: 100 %

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487 / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 2.94 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 56216 / Symmetry type: POINT

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