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- EMDB-7960: Open state GluA2 in complex with STZ and blocked by IEM-1460, aft... -

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Basic information

Entry
Database: EMDB / ID: EMD-7960
TitleOpen state GluA2 in complex with STZ and blocked by IEM-1460, after micelle signal subtraction
Map dataTMD-directed refinement after micelle signal subtraction
Sample
  • Complex: Open state GluA2 in complex with STZ and blocked by IEM-1460, after micelle signal subtraction
    • Protein or peptide: Glutamate receptor 2,Voltage-dependent calcium channel gamma-2 subunit
  • Ligand: GLUTAMIC ACID
  • Ligand: CYCLOTHIAZIDE
  • Ligand: N,N,N-trimethyl-5-({[(3s,5s,7s)-tricyclo[3.3.1.1~3,7~]decan-1-yl]methyl}amino)pentan-1-aminium
KeywordsIon channel / TRANSPORT PROTEIN
Function / homology
Function and homology information


LGI-ADAM interactions / Presynaptic depolarization and calcium channel opening / eye blink reflex / positive regulation of protein localization to basolateral plasma membrane / neurotransmitter receptor transport, postsynaptic endosome to lysosome / neurotransmitter receptor internalization / cerebellar mossy fiber / regulation of AMPA receptor activity / Trafficking of AMPA receptors / postsynaptic neurotransmitter receptor diffusion trapping ...LGI-ADAM interactions / Presynaptic depolarization and calcium channel opening / eye blink reflex / positive regulation of protein localization to basolateral plasma membrane / neurotransmitter receptor transport, postsynaptic endosome to lysosome / neurotransmitter receptor internalization / cerebellar mossy fiber / regulation of AMPA receptor activity / Trafficking of AMPA receptors / postsynaptic neurotransmitter receptor diffusion trapping / membrane hyperpolarization / protein targeting to membrane / voltage-gated calcium channel complex / neurotransmitter receptor localization to postsynaptic specialization membrane / neuromuscular junction development / spine synapse / dendritic spine neck / dendritic spine head / Activation of AMPA receptors / channel regulator activity / perisynaptic space / AMPA glutamate receptor activity / transmission of nerve impulse / ligand-gated monoatomic cation channel activity / Trafficking of GluR2-containing AMPA receptors / response to lithium ion / immunoglobulin binding / AMPA glutamate receptor complex / kainate selective glutamate receptor activity / ionotropic glutamate receptor complex / cellular response to glycine / extracellularly glutamate-gated ion channel activity / membrane depolarization / asymmetric synapse / regulation of receptor recycling / Unblocking of NMDA receptors, glutamate binding and activation / positive regulation of synaptic transmission / glutamate receptor binding / voltage-gated calcium channel activity / glutamate-gated receptor activity / regulation of synaptic transmission, glutamatergic / response to fungicide / cytoskeletal protein binding / presynaptic active zone membrane / ionotropic glutamate receptor binding / dendrite membrane / glutamate-gated calcium ion channel activity / extracellular ligand-gated monoatomic ion channel activity / somatodendritic compartment / cellular response to brain-derived neurotrophic factor stimulus / ligand-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential / dendrite cytoplasm / ionotropic glutamate receptor signaling pathway / positive regulation of synaptic transmission, glutamatergic / SNARE binding / hippocampal mossy fiber to CA3 synapse / dendritic shaft / transmitter-gated monoatomic ion channel activity involved in regulation of postsynaptic membrane potential / synaptic transmission, glutamatergic / PDZ domain binding / protein tetramerization / synaptic membrane / modulation of chemical synaptic transmission / establishment of protein localization / postsynaptic density membrane / terminal bouton / Schaffer collateral - CA1 synapse / cerebral cortex development / receptor internalization / response to calcium ion / synaptic vesicle membrane / endocytic vesicle membrane / synaptic vesicle / signaling receptor activity / presynapse / amyloid-beta binding / presynaptic membrane / growth cone / scaffold protein binding / chemical synaptic transmission / perikaryon / postsynaptic membrane / dendritic spine / postsynaptic density / neuron projection / axon / neuronal cell body / dendrite / synapse / protein-containing complex binding / protein kinase binding / glutamatergic synapse / cell surface / endoplasmic reticulum / protein-containing complex / identical protein binding / membrane / plasma membrane
Similarity search - Function
Voltage-dependent calcium channel, gamma-2 subunit / : / PMP-22/EMP/MP20/Claudin family / Voltage-dependent calcium channel, gamma subunit / PMP-22/EMP/MP20/Claudin superfamily / 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 ...Voltage-dependent calcium channel, gamma-2 subunit / : / PMP-22/EMP/MP20/Claudin family / Voltage-dependent calcium channel, gamma subunit / PMP-22/EMP/MP20/Claudin superfamily / 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 2 / Voltage-dependent calcium channel gamma-2 subunit
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.4 Å
AuthorsTwomey EC / Yelshanskaya MV
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS093838 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS083660 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)CA206573 United States
CitationJournal: Neuron / Year: 2018
Title: Mechanisms of Channel Block in Calcium-Permeable AMPA Receptors.
Authors: Edward C Twomey / Maria V Yelshanskaya / Alexander A Vassilevski / Alexander I Sobolevsky /
Abstract: AMPA receptors mediate fast excitatory neurotransmission and are critical for CNS development and function. Calcium-permeable subsets of AMPA receptors are strongly implicated in acute and chronic ...AMPA receptors mediate fast excitatory neurotransmission and are critical for CNS development and function. Calcium-permeable subsets of AMPA receptors are strongly implicated in acute and chronic neurological disorders. However, despite the clinical importance, the therapeutic landscape for specifically targeting them, and not the calcium-impermeable AMPA receptors, remains largely undeveloped. To address this problem, we used cryo-electron microscopy and electrophysiology to investigate the mechanisms by which small-molecule blockers selectively inhibit ion channel conductance in calcium-permeable AMPA receptors. We determined the structures of calcium-permeable GluA2 AMPA receptor complexes with the auxiliary subunit stargazin bound to channel blockers, including the orb weaver spider toxin AgTx-636, the spider toxin analog NASPM, and the adamantane derivative IEM-1460. Our structures provide insights into the architecture of the blocker binding site and the mechanism of trapping, which are critical for development of small molecules that specifically target calcium-permeable AMPA receptors.
History
DepositionJun 4, 2018-
Header (metadata) releaseJul 4, 2018-
Map releaseAug 22, 2018-
UpdateNov 13, 2024-
Current statusNov 13, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.04
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.04
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6dm0
  • Surface level: 0.04
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_7960.png

Downloads & links

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Map

FileDownload / File: emd_7960.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationTMD-directed refinement after micelle signal subtraction
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 300 pix.
= 324. Å		1.08 Å/pix.
x 300 pix.
= 324. Å		1.08 Å/pix.
x 300 pix.
= 324. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.04 / Movie #1: 0.04
Minimum - Maximum-0.069580205 - 0.14075422
Average (Standard dev.)0.0006538125 (±0.005154319)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 324.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.081.081.08
M x/y/z300300300
origin x/y/z0.0000.0000.000
length x/y/z324.000324.000324.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS300300300
D min/max/mean-0.0700.1410.001

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Supplemental data

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Additional map: Refinement of full map after micelle signal subtraction

Fileemd_7960_additional.map
AnnotationRefinement of full map after micelle signal subtraction
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Open state GluA2 in complex with STZ and blocked by IEM-1460, aft...

EntireName: Open state GluA2 in complex with STZ and blocked by IEM-1460, after micelle signal subtraction
Components
  • Complex: Open state GluA2 in complex with STZ and blocked by IEM-1460, after micelle signal subtraction
    • Protein or peptide: Glutamate receptor 2,Voltage-dependent calcium channel gamma-2 subunit
  • Ligand: GLUTAMIC ACID
  • Ligand: CYCLOTHIAZIDE
  • Ligand: N,N,N-trimethyl-5-({[(3s,5s,7s)-tricyclo[3.3.1.1~3,7~]decan-1-yl]methyl}amino)pentan-1-aminium

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Supramolecule #1: Open state GluA2 in complex with STZ and blocked by IEM-1460, aft...

SupramoleculeName: Open state GluA2 in complex with STZ and blocked by IEM-1460, after micelle signal subtraction
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Details: The full-map (non-TMD-directed) is included as a supplemental file
Source (natural)Organism: Rattus norvegicus (Norway rat)

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Macromolecule #1: Glutamate receptor 2,Voltage-dependent calcium channel gamma-2 subunit

MacromoleculeName: Glutamate receptor 2,Voltage-dependent calcium channel gamma-2 subunit
type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 115.178531 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: NSIQIGGLFP RGADQEYSAF RVGMVQFSTS EFRLTPHIDN LEVANSFAVT NAFCSQFSRG VYAIFGFYDK KSVNTITSFC GTLHVSFIT PSFPTDGTHP FVIQMRPDLK GALLSLIEYY QWDKFAYLYD SDRGLSTLQA VLDSAAEKKW QVTAINVGNI N NDKKDETY ...String:
NSIQIGGLFP RGADQEYSAF RVGMVQFSTS EFRLTPHIDN LEVANSFAVT NAFCSQFSRG VYAIFGFYDK KSVNTITSFC GTLHVSFIT PSFPTDGTHP FVIQMRPDLK GALLSLIEYY QWDKFAYLYD SDRGLSTLQA VLDSAAEKKW QVTAINVGNI N NDKKDETY RSLFQDLELK KERRVILDCE RDKVNDIVDQ VITIGKHVKG YHYIIANLGF TDGDLLKIQF GGAEVSGFQI VD YDDSLVS KFIERWSTLE EKEYPGAHTA TIKYTSALTY DAVQVMTEAF RNLRKQRIEI SRRGNAGDCL ANPAVPWGQG VEI ERALKQ VQVEGLSGNI KFDQNGKRIN YTINIMELKT NGPRKIGYWS EVDKMVLTED DTSGLEQKTV VVTTILESPY VMMK KNHEM LEGNERYEGY CVDLAAEIAK HCGFKYKLTI VGDGKYGARD ADTKIWNGMV GELVYGKADI AIAPLTITLV REEVI DFSK PFMSLGISIM IKKPQKSKPG VFSFLDPLAY EIWMCIVFAY IGVSVVLFLV SRFSPYEWHT EEFEDGRETQ SSESTN EFG IFNSLWFSLG AFMQQGCDIS PRSLSGRIVG GVWWFFTLII ISSYTANLAA FLTVERMVSP IESAEDLSKQ TEIAYGT LD SGSTKEFFRR SKIAVFDKMW TYMRSAEPSV FVRTTAEGVA RVRKSKGKYA YLLESTMNEY IEQRKPCDTM KVGGNLDS K GYGIATPKGS SLGTPVNLAV LKLSEQGVLD KLKNKWWYDK GECGAKDSGS KEKTSALSLS NVAGVFYILV GGLGLAMLV ALIEFCYKSR AEAKRMKGTG LFDRGVQMLL TTVGAFAAFS LMTIAVGTDY WLYSRGVCKT KSVSEDETSK KNEEVMTHSG LWRTCCLEG NFKGLCKQID HFPEDADYEA DTAEYFLRAV RASSIFPILS VILLFMGGLC IAASEFYKTR HNIILSAGIF F VSAGLSNI IGIIVYISAN AGDPSKSDSK KNSYSYGWSF YFGALSFIIA EMVGVLAVHM FIDRHKQLTG GAE

UniProtKB: Glutamate receptor 2, Voltage-dependent calcium channel gamma-2 subunit

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Macromolecule #2: GLUTAMIC ACID

MacromoleculeName: GLUTAMIC ACID / type: ligand / ID: 2 / Number of copies: 4 / Formula: GLU
Molecular weightTheoretical: 147.129 Da
Chemical component information

ChemComp-GLU:
GLUTAMIC ACID

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Macromolecule #3: CYCLOTHIAZIDE

MacromoleculeName: CYCLOTHIAZIDE / type: ligand / ID: 3 / Number of copies: 4 / Formula: CYZ
Molecular weightTheoretical: 389.878 Da
Chemical component information

ChemComp-CYZ:
CYCLOTHIAZIDE

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Macromolecule #4: N,N,N-trimethyl-5-({[(3s,5s,7s)-tricyclo[3.3.1.1~3,7~]decan-1-yl]...

MacromoleculeName: N,N,N-trimethyl-5-({[(3s,5s,7s)-tricyclo[3.3.1.1~3,7~]decan-1-yl]methyl}amino)pentan-1-aminium
type: ligand / ID: 4 / Number of copies: 1 / Formula: GZD
Molecular weightTheoretical: 293.51 Da
Chemical component information

ChemComp-GZD:
N,N,N-trimethyl-5-({[(3s,5s,7s)-tricyclo[3.3.1.1~3,7~]decan-1-yl]methyl}amino)pentan-1-aminium

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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

Concentration4 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV
DetailsOpen state GluA2 in complex with STZ and blocked by IEM-1460, after micelle signal subtraction

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average exposure time: 8.0 sec. / Average electron dose: 55.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

5weo


Details: Activated GluA2 complex bound to glutamate, cyclothiazide, and STZ in digitonin
Final reconstructionApplied symmetry - Point group: C2 (2 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 4.4 Å / Resolution method: FSC 0.143 CUT-OFF
Details: Full map resolution (supplemental file) is 4.8 angstrom.
Number images used: 30849
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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Atomic model buiding 1

RefinementSpace: REAL
Output model

PDB-6dm0:
Open state GluA2 in complex with STZ and blocked by IEM-1460, after micelle signal subtraction

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