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- PDB-9gu2: Human adult muscle nAChR in desensitised state in nanodisc with 1... -

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Basic information

Entry
Database: PDB / ID: 9gu2
TitleHuman adult muscle nAChR in desensitised state in nanodisc with 100 uM acetylcholine
Components
  • (Acetylcholine receptor subunit ...) x 4
  • Fab35 heavy chain
  • Fab35 light chain
KeywordsMEMBRANE PROTEIN / Ligand-gated ion channel / nicotinic receptor / pLGIC / cys-loop receptor
Function / homology
Function and homology information


postsynaptic membrane organization / skeletal muscle tissue growth / musculoskeletal movement / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / acetylcholine-gated channel complex / neuromuscular synaptic transmission / behavioral response to nicotine ...postsynaptic membrane organization / skeletal muscle tissue growth / musculoskeletal movement / Highly sodium permeable postsynaptic acetylcholine nicotinic receptors / Highly calcium permeable nicotinic acetylcholine receptors / Highly calcium permeable postsynaptic nicotinic acetylcholine receptors / acetylcholine receptor activity / acetylcholine-gated channel complex / neuromuscular synaptic transmission / behavioral response to nicotine / acetylcholine-gated monoatomic cation-selective channel activity / muscle cell development / acetylcholine binding / nervous system process / synaptic transmission, cholinergic / monoatomic cation transmembrane transporter activity / acetylcholine receptor signaling pathway / muscle cell cellular homeostasis / postsynaptic specialization membrane / ligand-gated monoatomic ion channel activity / neuromuscular process / neuromuscular junction development / monoatomic cation transport / membrane depolarization / skeletal muscle contraction / neuronal action potential / muscle contraction / bioluminescence / regulation of membrane potential / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / generation of precursor metabolites and energy / response to nicotine / neuromuscular junction / neuron cellular homeostasis / transmembrane signaling receptor activity / channel activity / monoatomic ion transmembrane transport / chemical synaptic transmission / postsynaptic membrane / neuron projection / synapse / cell surface / signal transduction / plasma membrane
Similarity search - Function
Nicotinic acetylcholine receptor / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Green fluorescent protein, GFP / Neurotransmitter-gated ion-channel / Neurotransmitter-gated ion-channel ligand-binding domain ...Nicotinic acetylcholine receptor / Neurotransmitter-gated ion-channel transmembrane domain / Neurotransmitter-gated ion-channel transmembrane region / Neurotransmitter-gated ion-channel, conserved site / Neurotransmitter-gated ion-channels signature. / Neurotransmitter-gated ion-channel transmembrane domain superfamily / Neuronal acetylcholine receptor / Green fluorescent protein, GFP / 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 / Green fluorescent protein-related / Green fluorescent protein / Green fluorescent protein
Similarity search - Domain/homology
ACETYLCHOLINE / COPPER (II) ION / Acetylcholine receptor subunit alpha / Acetylcholine receptor subunit beta / Green fluorescent protein / Acetylcholine receptor subunit epsilon / Acetylcholine receptor subunit delta
Similarity search - Component
Biological speciesHomo sapiens (human)
Aequorea victoria (jellyfish)
Rattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.73 Å
AuthorsLi, A. / Pike, A.C.W. / Chi, G. / Webster, R. / Maxwell, S. / Liu, W. / Beeson, D. / Sauer, D.B. / Dong, Y.Y.
Funding support United Kingdom, 2items
OrganizationGrant numberCountry
Wellcome Trust102161/Z/13/Z United Kingdom
Medical Research Council (MRC, United Kingdom)MR/Y012623/1 United Kingdom
Citation
Journal: Cell Rep / Year: 2025
Title: Structures of the human adult muscle-type nicotinic receptor in resting and desensitized states.
Authors: Anna Li / Ashley C W Pike / Richard Webster / Susan Maxwell / Wei-Wei Liu / Gamma Chi / Jacqueline Palace / David Beeson / David B Sauer / Yin Yao Dong /
Abstract: Muscle-type nicotinic acetylcholine receptor (AChR) is the key signaling molecule in neuromuscular junctions. Here, we present the structures of full-length human adult receptors in complex with ...Muscle-type nicotinic acetylcholine receptor (AChR) is the key signaling molecule in neuromuscular junctions. Here, we present the structures of full-length human adult receptors in complex with Fab35 in α-bungarotoxin (αBuTx)-bound resting states and ACh-bound desensitized states. In addition to identifying the conformational changes during recovery from desensitization, we also used electrophysiology to probe the effects of eight previously unstudied AChR genetic variants found in patients with congenital myasthenic syndrome (CMS), revealing they cause either slow- or fast-channel CMS characterized by prolonged or abbreviated ion channel bursts. The combined kinetic and structural data offer a better understanding of both the AChR state transition and the pathogenic mechanisms of disease variants.
#1: Journal: Acta Crystallogr D Struct Biol / Year: 2019
Title: Macromolecular structure determination using X-rays, neutrons and electrons: recent developments in Phenix.
Authors: Dorothee Liebschner / Pavel V Afonine / Matthew L Baker / Gábor Bunkóczi / Vincent B Chen / Tristan I Croll / Bradley Hintze / Li Wei Hung / Swati Jain / Airlie J McCoy / Nigel W Moriarty ...Authors: Dorothee Liebschner / Pavel V Afonine / Matthew L Baker / Gábor Bunkóczi / Vincent B Chen / Tristan I Croll / Bradley Hintze / Li Wei Hung / Swati Jain / Airlie J McCoy / Nigel W Moriarty / Robert D Oeffner / Billy K Poon / Michael G Prisant / Randy J Read / Jane S Richardson / David C Richardson / Massimo D Sammito / Oleg V Sobolev / Duncan H Stockwell / Thomas C Terwilliger / Alexandre G Urzhumtsev / Lizbeth L Videau / Christopher J Williams / Paul D Adams /
Abstract: Diffraction (X-ray, neutron and electron) and electron cryo-microscopy are powerful methods to determine three-dimensional macromolecular structures, which are required to understand biological ...Diffraction (X-ray, neutron and electron) and electron cryo-microscopy are powerful methods to determine three-dimensional macromolecular structures, which are required to understand biological processes and to develop new therapeutics against diseases. The overall structure-solution workflow is similar for these techniques, but nuances exist because the properties of the reduced experimental data are different. Software tools for structure determination should therefore be tailored for each method. Phenix is a comprehensive software package for macromolecular structure determination that handles data from any of these techniques. Tasks performed with Phenix include data-quality assessment, map improvement, model building, the validation/rebuilding/refinement cycle and deposition. Each tool caters to the type of experimental data. The design of Phenix emphasizes the automation of procedures, where possible, to minimize repetitive and time-consuming manual tasks, while default parameters are chosen to encourage best practice. A graphical user interface provides access to many command-line features of Phenix and streamlines the transition between programs, project tracking and re-running of previous tasks.
History
DepositionSep 18, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 14, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Acetylcholine receptor subunit alpha
B: Acetylcholine receptor subunit beta
D: Acetylcholine receptor subunit delta
E: Acetylcholine receptor subunit epsilon,Green fluorescent protein
L: Acetylcholine receptor subunit alpha
C: Fab35 light chain
F: Fab35 heavy chain
G: Fab35 light chain
H: Fab35 heavy chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)392,40219
Polymers386,1569
Non-polymers6,24510
Water1,71195
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Acetylcholine receptor subunit ... , 4 types, 5 molecules ALBDE

#1: Protein Acetylcholine receptor subunit alpha


Mass: 49747.645 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CHRNA1, ACHRA, CHNRA / Plasmid: TLCV2 / Cell line (production host): Expi293F / Production host: Homo sapiens (human) / References: UniProt: P02708
#2: Protein Acetylcholine receptor subunit beta


Mass: 54596.477 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CHRNB1, ACHRB, CHRNB / Plasmid: TLCV2 / Cell line (production host): Expi293F / Production host: Homo sapiens (human) / References: UniProt: P11230
#3: Protein Acetylcholine receptor subunit delta


Mass: 56915.359 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CHRND, ACHRD / Plasmid: TLCV2 / Cell line (production host): Expi293F / Production host: Homo sapiens (human) / References: UniProt: Q07001
#4: Protein Acetylcholine receptor subunit epsilon,Green fluorescent protein


Mass: 80603.750 Da / Num. of mol.: 1
Mutation: EGFP insertion between residues R344 and A345 in the M3-M4 intracellular loop
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Aequorea victoria (jellyfish)
Gene: CHRNE, ACHRE, GFP / Plasmid: TLCV2 / Cell line (production host): Expi293F / Production host: Homo sapiens (human) / References: UniProt: Q04844, UniProt: P42212

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Antibody , 2 types, 4 molecules CGFH

#5: Antibody Fab35 light chain


Mass: 23392.982 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Cell line (production host): Hybridoma / Production host: Rattus norvegicus (Norway rat)
#6: Antibody Fab35 heavy chain


Mass: 23879.758 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Cell line (production host): Hybridoma / Production host: Rattus norvegicus (Norway rat)

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Sugars , 5 types, 7 molecules

#7: Polysaccharide alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)-[alpha-D- ...alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1235.105 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpa1-6]DManpa1-6[DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,7,6/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3-3/a4-b1_b4-c1_c3-d1_c6-e1_e3-f1_e6-g1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#8: Polysaccharide alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1- ...alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-6DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3/a4-b1_b4-c1_c6-d1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(6+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#9: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1276.157 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-2DManpa1-3[DManpa1-3DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,7,6/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-1-3-3/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1_f3-g1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][b-D-GlcpNAc]{}}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#10: 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.: 1
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
#12: 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.: 1 / 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, 98 molecules

#11: Chemical ChemComp-ACH / ACETYLCHOLINE


Mass: 146.207 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C7H16NO2 / Comment: neurotransmitter*YM
#13: Chemical ChemComp-CU / COPPER (II) ION


Mass: 63.546 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Cu
#14: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 95 / 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: Human adult muscle nAChR in desensitised state in nanodisc with 100 uM acetylcholine
Type: COMPLEX
Details: nAChR in complex with acetylcholine and Fab35 in MSP2N2-soy polar lipids nanodiscs
Entity ID: #1-#6 / Source: RECOMBINANT
Molecular weightValue: 0.386 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: Expi293F / Plasmid: TLCV2
Buffer solutionpH: 7.5 / Details: 20 mM HEPES pH 7.5, 150 mM NaCl
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPESC8H18N2O4S1
2150 mMsodium chlorideNaCl1
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was monodisperse
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.35 K / Details: 2.5 ul sample, blot time=6 s, blot force=-10

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS / Details: objective aperture 100 um
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 2400 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 6.84 sec. / Electron dose: 50 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 13868
EM imaging opticsEnergyfilter name: TFS Selectris X / Energyfilter slit width: 10 eV
Image scansWidth: 4096 / Height: 4096

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Processing

EM software
IDNameVersionCategory
1cryoSPARC3.3.1particle selection
2EPUimage acquisition
4cryoSPARC3.3.1CTF correction
7UCSF ChimeraX1.6.1model fitting
8Coot0.9.8model fitting
9ISOLDEmodel fitting
11cryoSPARC3.3.1initial Euler assignment
12cryoSPARC3.3.1final Euler assignment
13RELION3.1.3classification
14cryoSPARC3.3.13D reconstruction
15PHENIX1.21.1_5286model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 2034352 / Details: extracted by topaz picking
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.73 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 175800 / Algorithm: FOURIER SPACE / Details: Non-uniform refinement / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Details: Initial fitting of alphafold models using chimeraX followed by manual rebuilding in COOT and final refinement in ISOLDE and PHENIX
Atomic model building
ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
11P027081AlphaFoldin silico model
21P112302AlphaFoldin silico model
31Q070013AlphaFoldin silico model
41Q048444AlphaFoldin silico model
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 122.23 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.002222058
ELECTRON MICROSCOPYf_angle_d0.487530197
ELECTRON MICROSCOPYf_chiral_restr0.04173655
ELECTRON MICROSCOPYf_plane_restr0.00433749
ELECTRON MICROSCOPYf_dihedral_angle_d13.11287928

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