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- PDB-9b36: Open state of kainate receptor GluK2 in complex with agonist glut... -

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Basic information

Entry
Database: PDB / ID: 9b36
TitleOpen state of kainate receptor GluK2 in complex with agonist glutamate and positive allosteric modulator BPAM344 bound to two concanavalin A dimers. Composite map.
Components
  • Concanavalin A
  • Glutamate receptor ionotropic, kainate 2
KeywordsMEMBRANE PROTEIN / kainate receptor / GluK2 / positive allosteric modulator / BPAM344 / open / concanavalin A / ConA / glutamate
Function / homology
Function and homology information


mossy fiber rosette / detection of cold stimulus involved in thermoception / Activation of Na-permeable kainate receptors / kainate selective glutamate receptor complex / Activation of Ca-permeable Kainate Receptor / D-glucose binding / negative regulation of synaptic transmission, glutamatergic / regulation of short-term neuronal synaptic plasticity / inhibitory postsynaptic potential / glutamate receptor activity ...mossy fiber rosette / detection of cold stimulus involved in thermoception / Activation of Na-permeable kainate receptors / kainate selective glutamate receptor complex / Activation of Ca-permeable Kainate Receptor / D-glucose binding / negative regulation of synaptic transmission, glutamatergic / regulation of short-term neuronal synaptic plasticity / inhibitory postsynaptic potential / glutamate receptor activity / ubiquitin conjugating enzyme binding / receptor clustering / modulation of excitatory postsynaptic potential / extracellularly glutamate-gated ion channel activity / D-mannose binding / regulation of JNK cascade / kainate selective glutamate receptor activity / ionotropic glutamate receptor complex / behavioral fear response / neuronal action potential / positive regulation of synaptic transmission / glutamate-gated receptor activity / glutamate-gated calcium ion channel activity / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / presynaptic modulation of chemical synaptic transmission / dendrite cytoplasm / hippocampal mossy fiber to CA3 synapse / regulation of membrane potential / SNARE binding / excitatory postsynaptic potential / synaptic transmission, glutamatergic / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / PDZ domain binding / postsynaptic density membrane / regulation of long-term neuronal synaptic plasticity / modulation of chemical synaptic transmission / terminal bouton / intracellular calcium ion homeostasis / vasodilation / positive regulation of neuron apoptotic process / manganese ion binding / presynaptic membrane / scaffold protein binding / chemical synaptic transmission / perikaryon / postsynaptic membrane / neuron apoptotic process / negative regulation of neuron apoptotic process / postsynaptic density / axon / neuronal cell body / glutamatergic synapse / dendrite / ubiquitin protein ligase binding / calcium ion binding / synapse / identical protein binding / membrane / plasma membrane
Similarity search - Function
Legume lectin, alpha chain, conserved site / Legume lectins alpha-chain signature. / Legume lectins beta-chain signature. / Legume lectin domain / Legume lectin, beta chain, Mn/Ca-binding site / Legume lectin domain / : / Ionotropic glutamate receptor, metazoa / Ligated ion channel L-glutamate- and glycine-binding site / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain ...Legume lectin, alpha chain, conserved site / Legume lectins alpha-chain signature. / Legume lectins beta-chain signature. / Legume lectin domain / Legume lectin, beta chain, Mn/Ca-binding site / Legume lectin domain / : / Ionotropic glutamate receptor, metazoa / Ligated ion channel L-glutamate- and glycine-binding site / Ionotropic glutamate receptor, L-glutamate and glycine-binding domain / Ligated ion channel L-glutamate- and glycine-binding site / Ligand-gated ion channel / : / Ionotropic glutamate receptor / Eukaryotic homologues of bacterial periplasmic substrate binding proteins. / Receptor, ligand binding region / Receptor family ligand binding region / Periplasmic binding protein-like I / Concanavalin A-like lectin/glucanase domain superfamily
Similarity search - Domain/homology
Chem-2J9 / CHOLESTEROL / GLUTAMIC ACID / Chem-POV / Concanavalin V / Glutamate receptor ionotropic, kainate 2
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
Canavalia ensiformis (jack bean)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.29 Å
AuthorsNadezhdin, K.D. / Gangwar, S.P. / Sobolevsky, A.I.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01 NS083660 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01 NS107253 United States
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)R01 AR078814 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)R01 CA206573 United States
CitationJournal: Nature / Year: 2024
Title: Kainate receptor channel opening and gating mechanism.
Authors: Shanti Pal Gangwar / Maria V Yelshanskaya / Kirill D Nadezhdin / Laura Y Yen / Thomas P Newton / Muhammed Aktolun / Maria G Kurnikova / Alexander I Sobolevsky /
Abstract: Kainate receptors, a subclass of ionotropic glutamate receptors, are tetrameric ligand-gated ion channels that mediate excitatory neurotransmission. Kainate receptors modulate neuronal circuits and ...Kainate receptors, a subclass of ionotropic glutamate receptors, are tetrameric ligand-gated ion channels that mediate excitatory neurotransmission. Kainate receptors modulate neuronal circuits and synaptic plasticity during the development and function of the central nervous system and are implicated in various neurological and psychiatric diseases, including epilepsy, depression, schizophrenia, anxiety and autism. Although structures of kainate receptor domains and subunit assemblies are available, the mechanism of kainate receptor gating remains poorly understood. Here we present cryo-electron microscopy structures of the kainate receptor GluK2 in the presence of the agonist glutamate and the positive allosteric modulators lectin concanavalin A and BPAM344. Concanavalin A and BPAM344 inhibit kainate receptor desensitization and prolong activation by acting as a spacer between the amino-terminal and ligand-binding domains and a stabilizer of the ligand-binding domain dimer interface, respectively. Channel opening involves the kinking of all four pore-forming M3 helices. Our structures reveal the molecular basis of kainate receptor gating, which could guide the development of drugs for treatment of neurological disorders.
History
DepositionMar 18, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 22, 2024Provider: repository / Type: Initial release
Revision 1.1Jun 5, 2024Group: Database references / Category: citation / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Jun 26, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Glutamate receptor ionotropic, kainate 2
B: Glutamate receptor ionotropic, kainate 2
C: Glutamate receptor ionotropic, kainate 2
D: Glutamate receptor ionotropic, kainate 2
E: Concanavalin A
F: Concanavalin A
G: Concanavalin A
H: Concanavalin A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)549,86274
Polymers514,3968
Non-polymers35,46666
Water00
1


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

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Components

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Protein , 2 types, 8 molecules ABCDEFGH

#1: Protein
Glutamate receptor ionotropic, kainate 2 / GluK2 / Glutamate receptor 6 / GluR-6 / GluR6


Mass: 102976.586 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Grik2, Glur6 / Production host: Homo sapiens (human) / References: UniProt: P42260
#2: Protein
Concanavalin A / ConV


Mass: 25622.385 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Canavalia ensiformis (jack bean) / References: UniProt: C0HJY1

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Sugars , 7 types, 28 molecules

#3: Polysaccharide beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose- ...beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-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: 1276.157 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGalpb1-4DGlcpNAcb1-2DManpa1-6[DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/4,7,6/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5][a2112h-1b_1-5]/1-1-2-3-3-1-4/a4-b1_b4-c1_c3-d1_c6-e1_e2-f1_f4-g1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{[(2+1)][b-D-GlcpNAc]{[(4+1)][b-D-Galp]{}}}}}}}LINUCSPDB-CARE
#4: 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.: 12
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
#5: Polysaccharide beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose- ...beta-D-galactopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-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: 1479.349 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGalpb1-4DGlcpNAcb1-2DManpa1-6[DGlcpNAcb1-2DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/4,8,7/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5][a2112h-1b_1-5]/1-1-2-3-1-3-1-4/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1_f2-g1_g4-h1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-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]{[(2+1)][b-D-GlcpNAc]{[(4+1)][b-D-Galp]{}}}}}}}LINUCSPDB-CARE
#6: 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.: 5
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
#7: Polysaccharide beta-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4) ...beta-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: 748.682 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-3DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2-2/a4-b1_b4-c1_c3-d1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][b-D-Manp]{}}}}}LINUCSPDB-CARE
#8: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[2-acetamido-2-deoxy- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-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: 1317.209 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-2DManpa1-3[DGlcpNAcb1-2DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam 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]/1-1-2-3-1-3-1/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1_f2-g1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-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]{[(2+1)][b-D-GlcpNAc]{}}}}}}LINUCSPDB-CARE
#9: 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.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-6DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam 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
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE

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Non-polymers , 6 types, 38 molecules

#10: Chemical
ChemComp-2J9 / 4-cyclopropyl-7-fluoro-3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide


Mass: 242.270 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H11FN2O2S / Feature type: SUBJECT OF INVESTIGATION
#11: Chemical
ChemComp-GLU / GLUTAMIC ACID


Type: L-peptide linking / Mass: 147.129 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C5H9NO4 / Feature type: SUBJECT OF INVESTIGATION
#12: Chemical
ChemComp-POV / (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / POPC


Mass: 760.076 Da / Num. of mol.: 14 / Source method: obtained synthetically / Formula: C42H82NO8P / Comment: phospholipid*YM
#13: Chemical
ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C27H46O
#14: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn
#15: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Ca

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Details

Has ligand of interestY

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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: full-length rat GluK2 tetramer in complex with two concanavalin A dimers
Type: COMPLEX / Entity ID: #1-#2 / Source: MULTIPLE SOURCES
Molecular weightValue: 0.51 MDa / Experimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: Homo sapiens (human) / Cell: Human embryonic kidney 293 / Plasmid: pEG BacMam
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
1150 mMsodium chlorideNaCl1
220 mMtris(hydroxymethyl)aminomethane1
31 mMbeta-Mercaptoethanol1
40.05 %digitonin1
50.5 mMBPAM3441
60.09 mMconcanavalin A1
72.5 mML-Glutamic acid1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: UltrAuFoil R1.2/1.3
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: 2000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm
Image recordingAverage exposure time: 2.5 sec. / Electron dose: 58 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 5 / Num. of real images: 22990
Image scansWidth: 5760 / Height: 4092

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.4.1particle selection
4cryoSPARC4.4.1CTF correction
9PHENIX1.18model refinement
10cryoSPARC4.4.1initial Euler assignment
11cryoSPARC4.4.1final Euler assignment
13cryoSPARC4.4.13D reconstruction
CTF correctionType: NONE
Particle selectionNum. of particles selected: 8660229
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 4.29 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 109827
Details: This is composite map. Reference map: 4.29 A ATD: 3.5 A LBD-TMD: 3.4 A ConA: 3.58 A
Symmetry type: POINT
Atomic model buildingSpace: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00737230
ELECTRON MICROSCOPYf_angle_d1.24650570
ELECTRON MICROSCOPYf_dihedral_angle_d12.14128662
ELECTRON MICROSCOPYf_chiral_restr0.0695870
ELECTRON MICROSCOPYf_plane_restr0.0086166

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