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- PDB-8v8c: Alpha7-nicotinic acetylcholine receptor time resolved bound to ep... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8v8c | ||||||
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Title | Alpha7-nicotinic acetylcholine receptor time resolved bound to epibatidine and PNU-120596 asymmetric state 1 | ||||||
![]() | Neuronal acetylcholine receptor subunit alpha-7,Soluble cytochrome b562 | ||||||
![]() | MEMBRANE PROTEIN / ION CHANNEL / NICOTINIC RECEPTOR | ||||||
Function / homology | ![]() sensory processing / dendrite arborization / response to acetylcholine / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine-gated channel complex / regulation of amyloid fibril formation / short-term memory / positive regulation of CoA-transferase activity / acetylcholine receptor activity / dendritic spine organization ...sensory processing / dendrite arborization / response to acetylcholine / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine-gated channel complex / regulation of amyloid fibril formation / short-term memory / positive regulation of CoA-transferase activity / acetylcholine receptor activity / dendritic spine organization / chloride channel regulator activity / acetylcholine binding / regulation of amyloid precursor protein catabolic process / acetylcholine receptor signaling pathway / acetylcholine-gated monoatomic cation-selective channel activity / positive regulation of amyloid-beta formation / negative regulation of amyloid-beta formation / plasma membrane raft / modulation of excitatory postsynaptic potential / positive regulation of excitatory postsynaptic potential / response to amyloid-beta / negative regulation of tumor necrosis factor production / toxic substance binding / monoatomic ion transport / monoatomic ion transmembrane transport / positive regulation of protein metabolic process / positive regulation of long-term synaptic potentiation / electron transport chain / synapse organization / response to nicotine / calcium channel activity / memory / cognition / intracellular calcium ion homeostasis / positive regulation of angiogenesis / calcium ion transport / monoatomic ion channel activity / amyloid-beta binding / postsynapse / postsynaptic membrane / positive regulation of MAPK cascade / periplasmic space / electron transfer activity / learning or memory / positive regulation of ERK1 and ERK2 cascade / response to hypoxia / neuron projection / iron ion binding / positive regulation of protein phosphorylation / synapse / heme binding / positive regulation of cell population proliferation / signal transduction / protein homodimerization activity / membrane / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.29 Å | ||||||
![]() | Burke, S.M. / Noviello, C.M. / Hibbs, R.E. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural mechanisms of α7 nicotinic receptor allosteric modulation and activation. Authors: Sean M Burke / Mariia Avstrikova / Colleen M Noviello / Nuriya Mukhtasimova / Jean-Pierre Changeux / Ganesh A Thakur / Steven M Sine / Marco Cecchini / Ryan E Hibbs / ![]() ![]() Abstract: The α7 nicotinic acetylcholine receptor is a pentameric ligand-gated ion channel that plays an important role in cholinergic signaling throughout the nervous system. Its unique physiological ...The α7 nicotinic acetylcholine receptor is a pentameric ligand-gated ion channel that plays an important role in cholinergic signaling throughout the nervous system. Its unique physiological characteristics and implications in neurological disorders and inflammation make it a promising but challenging therapeutic target. Positive allosteric modulators overcome limitations of traditional α7 agonists, but their potentiation mechanisms remain unclear. Here, we present high-resolution structures of α7-modulator complexes, revealing partially overlapping binding sites but varying conformational states. Structure-guided functional and computational tests suggest that differences in modulator activity arise from the stable rotation of a channel gating residue out of the pore. We extend the study using a time-resolved cryoelectron microscopy (cryo-EM) approach to reveal asymmetric state transitions for this homomeric channel and also find that a modulator with allosteric agonist activity exploits a distinct channel-gating mechanism. These results define mechanisms of α7 allosteric modulation and activation with implications across the pentameric receptor superfamily. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 654.7 KB | Display | ![]() |
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PDB format | ![]() | 545.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 2.3 MB | Display | ![]() |
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Full document | ![]() | 2.4 MB | Display | |
Data in XML | ![]() | 68.2 KB | Display | |
Data in CIF | ![]() | 100.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 43034MC ![]() 8ut1C ![]() 8utbC ![]() 8uzjC ![]() 8v80C ![]() 8v82C ![]() 8v86C ![]() 8v88C ![]() 8v89C ![]() 8v8aC ![]() 8v8dC C: citing same article ( M: map data used to model this data |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Protein , 1 types, 5 molecules ABCDE
#1: Protein | Mass: 67220.797 Da / Num. of mol.: 5 Source method: isolated from a genetically manipulated source Details: 351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage) ...Details: 351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage),351-353 (linker) 354-460 (SOLUBLE CYTOCHROME B562 FUSION) 551-558 (strep tag II) 559-571 (linker) 572-579 (strep tag II) 580-582 (linker) 583-599 (T2A self cleaving peptide post cleavage) Source: (gene. exp.) ![]() ![]() |
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-Sugars , 2 types, 15 molecules ![](data/chem/img/NAG.gif)
#2: Polysaccharide | 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose Source method: isolated from a genetically manipulated source #3: Sugar | ChemComp-NAG / |
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-Non-polymers , 3 types, 13 molecules ![](data/chem/img/EPJ.gif)
![](data/chem/img/I34.gif)
![](data/chem/img/CA.gif)
![](data/chem/img/I34.gif)
![](data/chem/img/CA.gif)
#4: Chemical | ChemComp-EPJ / #5: Chemical | ChemComp-I34 / #6: Chemical | |
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-Details
Has ligand of interest | Y |
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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: Alpha7-nicotinic acetylcholine receptor time resolved bound to epibatidine and PNU-120596 asymmetric state 1 Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.4 |
Specimen | Conc.: 6.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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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 / Nominal defocus max: 2000 nm / Nominal defocus min: 500 nm |
Image recording | Electron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.29 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 30540 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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