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- EMDB-48764: CryoEM structure of GluK2 bound to glutamate in the shallow desen... -

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Basic information

Entry
Database: EMDB / ID: EMD-48764
TitleCryoEM structure of GluK2 bound to glutamate in the shallow desensitized state, composite map
Map data
Sample
  • Complex: GluK2
    • Protein or peptide: Glutamate receptor ionotropic, kainate 2
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: GLUTAMIC ACID
KeywordscryoEM / glutamate / channel gating / STRUCTURAL PROTEIN
Function / homology
Function and homology information


mossy fiber rosette / detection of cold stimulus involved in thermoception / Activation of Na-permeable kainate receptors / Activation of Ca-permeable Kainate Receptor / kainate selective glutamate receptor complex / regulation of short-term neuronal synaptic plasticity / glutamate receptor activity / ubiquitin conjugating enzyme binding / negative regulation of synaptic transmission, glutamatergic / regulation of JNK cascade ...mossy fiber rosette / detection of cold stimulus involved in thermoception / Activation of Na-permeable kainate receptors / Activation of Ca-permeable Kainate Receptor / kainate selective glutamate receptor complex / regulation of short-term neuronal synaptic plasticity / glutamate receptor activity / ubiquitin conjugating enzyme binding / negative regulation of synaptic transmission, glutamatergic / regulation of JNK cascade / inhibitory postsynaptic potential / receptor clustering / kainate selective glutamate receptor activity / modulation of excitatory postsynaptic potential / extracellularly glutamate-gated ion channel activity / ionotropic glutamate receptor complex / positive regulation of synaptic transmission / behavioral fear response / neuronal action potential / 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 / SNARE binding / PDZ domain binding / excitatory postsynaptic potential / synaptic transmission, glutamatergic / regulation of membrane potential / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / regulation of long-term neuronal synaptic plasticity / postsynaptic density membrane / modulation of chemical synaptic transmission / intracellular calcium ion homeostasis / terminal bouton / positive regulation of neuron apoptotic process / presynaptic membrane / neuron apoptotic process / scaffold protein binding / chemical synaptic transmission / negative regulation of neuron apoptotic process / perikaryon / postsynaptic membrane / postsynaptic density / axon / neuronal cell body / ubiquitin protein ligase binding / synapse / dendrite / glutamatergic synapse / identical protein binding / membrane / plasma membrane
Similarity search - Function
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
Similarity search - Domain/homology
Glutamate receptor ionotropic, kainate 2
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsChang PZ / Nami T
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R35GM147266-01 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)3R35GM147266-01S1 United States
CitationJournal: To Be Published
Title: CryoEM structure of GluK2 bound to glutamate in the shallow desensitized state, composite map
Authors: Chang PZ / Nami T
History
DepositionJan 23, 2025-
Header (metadata) releaseFeb 4, 2026-
Map releaseFeb 4, 2026-
UpdateFeb 4, 2026-
Current statusFeb 4, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_48764.png

Downloads & links

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Map

FileDownload / File: emd_48764.map.gz / Format: CCP4 / Size: 67 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 260 pix.
= 275.6 Å		1.06 Å/pix.
x 260 pix.
= 275.6 Å		1.06 Å/pix.
x 260 pix.
= 275.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.235
Minimum - Maximum-1.9702849 - 3.2142754
Average (Standard dev.)0.009453446 (±0.08640354)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions260260260
Spacing260260260
CellA=B=C: 275.59998 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : GluK2

EntireName: GluK2
Components
  • Complex: GluK2
    • Protein or peptide: Glutamate receptor ionotropic, kainate 2
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: GLUTAMIC ACID

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Supramolecule #1: GluK2

SupramoleculeName: GluK2 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Rattus norvegicus (Norway rat)

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Macromolecule #1: Glutamate receptor ionotropic, kainate 2

MacromoleculeName: Glutamate receptor ionotropic, kainate 2 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Molecular weightTheoretical: 102.547031 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MKIISPVLSN LVFSRSIKVL LCLLWIGYSQ GTTHVLRFGG IFEYVESGPM GAEELAFRFA VNTINRNRTL LPNTTLTYDT QKINLYDSF EASKKACDQL SLGVAAIFGP SHSSSANAVQ SICNALGVPH IQTRWKHQVS DNKDSFYVSL YPDFSSLSRA I LDLVQFFK ...String:
MKIISPVLSN LVFSRSIKVL LCLLWIGYSQ GTTHVLRFGG IFEYVESGPM GAEELAFRFA VNTINRNRTL LPNTTLTYDT QKINLYDSF EASKKACDQL SLGVAAIFGP SHSSSANAVQ SICNALGVPH IQTRWKHQVS DNKDSFYVSL YPDFSSLSRA I LDLVQFFK WKTVTVVYDD STGLIRLQEL IKAPSRYNLR LKIRQLPADT KDAKPLLKEM KRGKEFHVIF DCSHEMAAGI LK QALAMGM MTEYYHYIFT TLDLFALDVE PYRYSGVNMT GFRILNTENT QVSSIIEKWS MERLQAPPKP DSGLLDGFMT TDA ALMYDA VHVVSVAVQQ FPQMTVSSLQ CNRHKPWRFG TRFMSLIKEA HWEGLTGRIT FNKTNGLRTD FDLDVISLKE EGLE KIGTW DPASGLNMTE SQKGKPANIT DSLSNRSLIV TTILEEPYVL FKKSDKPLYG NDRFEGYCID LLRELSTILG FTYEI RLVE DGKYGAQDDV NGQWNGMVRE LIDHKADLAV APLAITYVRE KVIDFSKPFM TLGISILYRK PNGTNPGVFS FLNPLS PDI WMYILLAYLG VSCVLFVIAR FSPYEWYNPH PCNPDSDVVE NNFTLLNSFW FGVGALMQQG SELMPKALST RIVGGIW WF FTLIIISSYT ANLAAFLTVE RMESPIDSAD DLACQTKIEY GAVEDGATMT FFKKSKISTY DKMWAFMSSR RQSVLVKS N EEGIQRVLTS DYAFLMESTT IEFVTQRNCN LTQIGGLIDS KGYGVGTPMG SPYRDKITIA ILQLQEEGKL HMMKEKWWR GCGCPEEESK EASALGVQNI GGIFIVLAAG LVLSVFVAVG EFLYKSKKNA QLEKRSFCSA MVEELRMSLK CQRRLKHKPQ APVIVKTEE VINMHTFNDR RLPGKETMA

UniProtKB: Glutamate receptor ionotropic, kainate 2

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Macromolecule #3: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 3 / Number of copies: 12 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #4: GLUTAMIC ACID

MacromoleculeName: GLUTAMIC ACID / type: ligand / ID: 4 / Number of copies: 4 / Formula: GLU
Molecular weightTheoretical: 147.129 Da
Chemical component information

ChemComp-GLU:
GLUTAMIC ACID

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration3 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TECNAI F30
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.6 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Tecnai F30 / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

9b36

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: OTHER / Software - Name: cryoSPARC / Number images used: 81654
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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