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- PDB-6cnj: Structure of the 2alpha3beta stiochiometry of the human Alpha4Bet... -
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Basic information
Entry | Database: PDB / ID: 6cnj | ||||||||||||
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Title | Structure of the 2alpha3beta stiochiometry of the human Alpha4Beta2 nicotinic receptor | ||||||||||||
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![]() | TRANSPORT PROTEIN / Ligand-gated ion channel / Acetylcholine receptor / Cys-loop Receptor / MEMBRANE PROTEIN | ||||||||||||
Function / homology | ![]() vestibulocochlear nerve development / lateral geniculate nucleus development / regulation of circadian sleep/wake cycle, REM sleep / regulation of synaptic transmission, dopaminergic / quaternary ammonium group binding / synaptic transmission involved in micturition / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / optic nerve morphogenesis / response to acetylcholine ...vestibulocochlear nerve development / lateral geniculate nucleus development / regulation of circadian sleep/wake cycle, REM sleep / regulation of synaptic transmission, dopaminergic / quaternary ammonium group binding / synaptic transmission involved in micturition / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / optic nerve morphogenesis / response to acetylcholine / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / central nervous system projection neuron axonogenesis / acetylcholine-gated channel complex / cholinergic synapse / regulation of dopamine metabolic process / negative regulation of action potential / behavioral response to nicotine / positive regulation of dopamine secretion / acetylcholine receptor activity / inhibitory postsynaptic potential / synaptic transmission, cholinergic / acetylcholine binding / postsynaptic specialization membrane / nervous system process / acetylcholine receptor signaling pathway / acetylcholine-gated monoatomic cation-selective channel activity / regulation of synapse assembly / action potential / regulation of dendrite morphogenesis / heterocyclic compound binding / B cell activation / regulation of dopamine secretion / plasma membrane raft / membrane depolarization / associative learning / 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 / response to cocaine / learning / locomotory behavior / regulation of membrane potential / sensory perception of sound / response to nicotine / 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 / synapse / dendrite / protein-containing complex binding / signal transduction / membrane / plasma membrane Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å | ||||||||||||
![]() | Walsh Jr, R.M. / Roh, S.H. / Gharpure, A. / Morales-Perez, C.L. / Teng, J. / Hibbs, R.E. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural principles of distinct assemblies of the human α4β2 nicotinic receptor. Authors: Richard M Walsh / Soung-Hun Roh / Anant Gharpure / Claudio L Morales-Perez / Jinfeng Teng / Ryan E Hibbs / ![]() Abstract: Fast chemical communication in the nervous system is mediated by neurotransmitter-gated ion channels. The prototypical member of this class of cell surface receptors is the cation-selective nicotinic ...Fast chemical communication in the nervous system is mediated by neurotransmitter-gated ion channels. The prototypical member of this class of cell surface receptors is the cation-selective nicotinic acetylcholine receptor. As with most ligand-gated ion channels, nicotinic receptors assemble as oligomers of subunits, usually as hetero-oligomers and often with variable stoichiometries . This intrinsic heterogeneity in protein composition provides fine tunability in channel properties, which is essential to brain function, but frustrates structural and biophysical characterization. The α4β2 subtype of the nicotinic acetylcholine receptor is the most abundant isoform in the human brain and is the principal target in nicotine addiction. This pentameric ligand-gated ion channel assembles in two stoichiometries of α- and β-subunits (2α:3β and 3α:2β). Both assemblies are functional and have distinct biophysical properties, and an imbalance in the ratio of assemblies is linked to both nicotine addiction and congenital epilepsy. Here we leverage cryo-electron microscopy to obtain structures of both receptor assemblies from a single sample. Antibody fragments specific to β2 were used to 'break' symmetry during particle alignment and to obtain high-resolution reconstructions of receptors of both stoichiometries in complex with nicotine. The results reveal principles of subunit assembly and the structural basis of the distinctive biophysical and pharmacological properties of the two different stoichiometries of this receptor. | ||||||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 564.3 KB | Display | ![]() |
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PDB format | ![]() | 463.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.8 MB | Display | ![]() |
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Full document | ![]() | 1.9 MB | Display | |
Data in XML | ![]() | 102.4 KB | Display | |
Data in CIF | ![]() | 145.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7535MC ![]() 7536C ![]() 6cnkC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Neuronal acetylcholine receptor subunit ... , 2 types, 5 molecules ADBCE
#1: Protein | Mass: 44862.367 Da / Num. of mol.: 2 Mutation: Glu-Arg linker was inserted in the MX-M4 junction, between Phe559-Ser560 in the alpha4 subunit Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #2: Protein | Mass: 46748.863 Da / Num. of mol.: 3 Mutation: Glu-Arg linker was inserted in the MX-M4 junction between Gln420-Ser421 in the beta 2 subunit. Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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-Antibody , 2 types, 6 molecules FHJGIK
#3: Antibody | Mass: 26378.596 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #4: Antibody | Mass: 51195.668 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Sugars , 2 types, 5 molecules ![](data/chem/img/NAG.gif)
#5: Polysaccharide | #6: Sugar | |
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-Non-polymers , 3 types, 13 molecules ![](data/chem/img/NCT.gif)
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#7: Chemical | #8: Chemical | ChemComp-Y01 / #9: Chemical | ChemComp-NA / | |
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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: Complex of three Fab fragments with the 2alpha3beta stoichiometry of the human Alpha4Beta2 nicotinic receptor Type: COMPLEX Details: Fab fragmented generated by proteolytic cleavage of IgG antibody Entity ID: #1-#4 / Source: MULTIPLE SOURCES | |||||||||||||||||||||||||||||||||||
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Molecular weight | Value: 0.344 MDa | |||||||||||||||||||||||||||||||||||
Source (natural) | Organism: ![]() | |||||||||||||||||||||||||||||||||||
Source (recombinant) | Organism: ![]() | |||||||||||||||||||||||||||||||||||
Buffer solution | pH: 7.4 | |||||||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | |||||||||||||||||||||||||||||||||||
Specimen support | Details: Sample was glow discharged at 30mA for 80 seconds using a PELCO easiGLow Grid material: GOLD / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3 | |||||||||||||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: 4 second blot time |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Calibrated magnification: 46730 X / Nominal defocus max: 4500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 90 K / Temperature (min): 80 K |
Image recording | Average exposure time: 15 sec. / Electron dose: 75 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 5166 |
EM imaging optics | Energyfilter name: GIF Quantum LS / Energyfilter upper: 10 eV / Energyfilter lower: -10 eV |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 649773 | ||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 263695 / Algorithm: BACK PROJECTION / Num. of class averages: 4 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: AB INITIO MODEL / Space: REAL | ||||||||||||||||||||||||||||||||||||||||
Refinement | Highest resolution: 3.4 Å |