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- EMDB-22023: hEAAT3-IFS-in250mM-KCl -

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ID or keywords:

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Basic information

Entry
Database: EMDB / ID: EMD-22023
TitlehEAAT3-IFS-in250mM-KCl
Map datahEAAT3 inward-facing in 250mM KCl
Sample
  • Complex: inward facing hEAAT3 trimer in 250mM KCl
    • Complex: inward facing hEAAT3 trimer in 250mM KCl
      • Protein or peptide: human Excitatory amino acid transporter 3
Keywordsinward-facing hEAAT3 in 250mM KCl / TRANSPORT PROTEIN
Function / homology
Function and homology information


D-aspartate transmembrane transport / regulation of protein targeting to membrane / D-aspartate transmembrane transporter activity / Defective SLC1A1 is implicated in schizophrenia 18 (SCZD18) and dicarboxylic aminoaciduria (DCBXA) / response to anesthetic / distal dendrite / cysteine transmembrane transporter activity / cysteine transport / high-affinity L-glutamate transmembrane transporter activity / glutamate:sodium symporter activity ...D-aspartate transmembrane transport / regulation of protein targeting to membrane / D-aspartate transmembrane transporter activity / Defective SLC1A1 is implicated in schizophrenia 18 (SCZD18) and dicarboxylic aminoaciduria (DCBXA) / response to anesthetic / distal dendrite / cysteine transmembrane transporter activity / cysteine transport / high-affinity L-glutamate transmembrane transporter activity / glutamate:sodium symporter activity / neurotransmitter receptor transport to plasma membrane / response to decreased oxygen levels / L-glutamate import / Transport of inorganic cations/anions and amino acids/oligopeptides / cellular response to mercury ion / retina layer formation / L-glutamate transmembrane transporter activity / L-glutamate transmembrane transport / D-aspartate import across plasma membrane / glutathione biosynthetic process / cellular response to ammonium ion / L-aspartate transmembrane transport / righting reflex / zinc ion transmembrane transport / cellular response to bisphenol A / L-aspartate transmembrane transporter activity / grooming behavior / L-aspartate import across plasma membrane / Glutamate Neurotransmitter Release Cycle / monoatomic anion channel activity / intracellular glutamate homeostasis / proximal dendrite / L-glutamate import across plasma membrane / transepithelial transport / apical dendrite / conditioned place preference / intracellular zinc ion homeostasis / cellular response to cocaine / chloride transmembrane transporter activity / blood vessel morphogenesis / motor neuron apoptotic process / response to morphine / motor behavior / glutamate receptor signaling pathway / neurotransmitter transport / glutamate binding / G protein-coupled dopamine receptor signaling pathway / superoxide metabolic process / maintenance of blood-brain barrier / heart contraction / perisynaptic space / adult behavior / dopamine metabolic process / glial cell projection / : / asymmetric synapse / postsynaptic modulation of chemical synaptic transmission / response to axon injury / behavioral fear response / transport across blood-brain barrier / synaptic cleft / positive regulation of heart rate / monoatomic ion transport / axon terminus / chloride transmembrane transport / response to amphetamine / dendritic shaft / neurogenesis / cell periphery / locomotory behavior / long-term synaptic potentiation / synapse organization / brain development / Schaffer collateral - CA1 synapse / cytokine-mediated signaling pathway / memory / recycling endosome membrane / late endosome membrane / presynapse / early endosome membrane / cellular response to oxidative stress / perikaryon / gene expression / chemical synaptic transmission / negative regulation of neuron apoptotic process / dendritic spine / apical plasma membrane / membrane raft / response to xenobiotic stimulus / axon / external side of plasma membrane / neuronal cell body / dendrite / endoplasmic reticulum / extracellular exosome / identical protein binding / membrane / metal ion binding / plasma membrane
Similarity search - Function
: / Sodium:dicarboxylate symporter family signature 2. / Sodium:dicarboxylate symporter / Sodium:dicarboxylate symporter, conserved site / Sodium:dicarboxylate symporter superfamily / Sodium:dicarboxylate symporter family / Sodium:dicarboxylate symporter family signature 1.
Similarity search - Domain/homology
Excitatory amino acid transporter 3
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.85 Å
AuthorsQiu B / Matthies D / Boudker O
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01NS064357 United States
CitationJournal: Sci Adv / Year: 2021
Title: Cryo-EM structures of excitatory amino acid transporter 3 visualize coupled substrate, sodium, and proton binding and transport.
Authors: Biao Qiu / Doreen Matthies / Eva Fortea / Zhiheng Yu / Olga Boudker /
Abstract: Human excitatory amino acid transporter 3 (hEAAT3) mediates glutamate uptake in neurons, intestine, and kidney. Here, we report cryo-EM structures of hEAAT3 in several functional states where the ...Human excitatory amino acid transporter 3 (hEAAT3) mediates glutamate uptake in neurons, intestine, and kidney. Here, we report cryo-EM structures of hEAAT3 in several functional states where the transporter is empty, bound to coupled sodium ions only, or fully loaded with three sodium ions, a proton, and the substrate aspartate. The structures suggest that hEAAT3 operates by an elevator mechanism involving three functionally independent subunits. When the substrate-binding site is near the cytoplasm, it has a remarkably low affinity for the substrate, perhaps facilitating its release and allowing the rapid transport turnover. The mechanism of the coupled uptake of the sodium ions and the substrate is conserved across evolutionarily distant families and is augmented by coupling to protons in EAATs. The structures further suggest a mechanism by which a conserved glutamate residue mediates proton symport.
History
DepositionMay 21, 2020-
Header (metadata) releaseApr 28, 2021-
Map releaseApr 28, 2021-
UpdateAug 30, 2023-
Current statusAug 30, 2023Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.021
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.021
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_22023.png

Downloads & links

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Map

FileDownload / File: emd_22023.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationhEAAT3 inward-facing in 250mM KCl
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 288 pix.
= 239.616 Å		0.83 Å/pix.
x 288 pix.
= 239.616 Å		0.83 Å/pix.
x 288 pix.
= 239.616 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.832 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.019 / Movie #1: 0.021
Minimum - Maximum-0.098668754 - 0.15530656
Average (Standard dev.)0.0000069293487 (±0.004183226)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 239.616 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8320.8320.832
M x/y/z288288288
origin x/y/z0.0000.0000.000
length x/y/z239.616239.616239.616
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ300300300
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS288288288
D min/max/mean-0.0990.1550.000

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Supplemental data

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Sample components

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Entire : inward facing hEAAT3 trimer in 250mM KCl

EntireName: inward facing hEAAT3 trimer in 250mM KCl
Components
  • Complex: inward facing hEAAT3 trimer in 250mM KCl
    • Complex: inward facing hEAAT3 trimer in 250mM KCl
      • Protein or peptide: human Excitatory amino acid transporter 3

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Supramolecule #1: inward facing hEAAT3 trimer in 250mM KCl

SupramoleculeName: inward facing hEAAT3 trimer in 250mM KCl / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #2: inward facing hEAAT3 trimer in 250mM KCl

SupramoleculeName: inward facing hEAAT3 trimer in 250mM KCl / type: complex / ID: 2 / Parent: 1 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: human Excitatory amino acid transporter 3

MacromoleculeName: human Excitatory amino acid transporter 3 / type: protein_or_peptide / ID: 1
Details: The Glycine and Proline at the N terminal are the residues left after PreScission Protease treatment
Enantiomer: LEVO
SequenceString: GPMGKPARKG CEWKRFLKNN WVLLSTVAAV VLGITTGVLV REHSNLSTLE KFYFAFPGEI LMRMLKLIIL PL IISSMIT GVAALDSNVS GKIGLRAVVY YFCTTLIAVI LGIVLVVSIK PGVTQKVGEI ARTGSTPEVS TVD AMLDLI RNMFPENLVQ ACFQQYKTKR ...String:
GPMGKPARKG CEWKRFLKNN WVLLSTVAAV VLGITTGVLV REHSNLSTLE KFYFAFPGEI LMRMLKLIIL PL IISSMIT GVAALDSNVS GKIGLRAVVY YFCTTLIAVI LGIVLVVSIK PGVTQKVGEI ARTGSTPEVS TVD AMLDLI RNMFPENLVQ ACFQQYKTKR EEVKPPSDPE MNMTEESFTA VMTTAISKNK TKEYKIVGMY SDGI NVLGL IVFCLVFGLV IGKMGEKGQI LVDFFNALSD ATMKIVQIIM CYMPLGILFL IAGKIIEVED WEIFR KLGL YMATVLTGLA IHSIVILPLI YFIVVRKNPF RFAMGMAQAL LTALMISSSS ATLPVTFRCA EENNQV DKR ITRFVLPVGA TINMDGTALY EAVAAVFIAQ LNDLDLGIGQ IITISITATS ASIGAAGVPQ AGLVTMV IV LSAVGLPAED VTLIIAVDWL LDRFRTMVNV LGDAFGTGIV EKLSKKELEQ MDVSSEVNIV NPFALEST I LDNEDSDTKK SYVNGGFAVD KSDTISFTQT SQF

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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

Concentration6 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
20.0 mMC4H11NO3Tris
250.0 mMKClpotassium chloride
1.0 mMC9H15O6PTCEP
0.086 mMC56H92O25Digitonin glyco diosgenin
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: blot 3s.
DetailsThis sample was mono disperse

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 105000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1769994
Startup modelType of model: OTHER
Final reconstructionNumber classes used: 2 / Applied symmetry - Point group: C3 (3 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 2.85 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 668093
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final 3D classificationNumber classes: 8 / Software - Name: RELION (ver. 3.0)
FSC plot (resolution estimation)

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