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- PDB-6x17: Outward-facing state of the glutamate transporter homologue GltPh... -

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Basic information

Entry
Database: PDB / ID: 6x17
TitleOutward-facing state of the glutamate transporter homologue GltPh in complex with TBOA
ComponentsGlutamate transporter homologue GltPh
KeywordsTRANSPORT PROTEIN / sodium-coupled L-aspartate transporter
Function / homology
Function and homology information


amino acid:sodium symporter activity / L-aspartate transmembrane transport / L-aspartate transmembrane transporter activity / L-aspartate import across plasma membrane / chloride transmembrane transporter activity / protein homotrimerization / chloride transmembrane transport / identical protein binding / metal ion binding / plasma membrane
Similarity search - Function
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
Chem-6OU / Glutamate transporter homolog
Similarity search - Component
Biological speciesPyrococcus horikoshii (archaea)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.66 Å
AuthorsWang, X. / Boudker, O.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R37NS085318 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01NS064357 United States
CitationJournal: Elife / Year: 2020
Title: Large domain movements through the lipid bilayer mediate substrate release and inhibition of glutamate transporters.
Authors: Xiaoyu Wang / Olga Boudker /
Abstract: Glutamate transporters are essential players in glutamatergic neurotransmission in the brain, where they maintain extracellular glutamate below cytotoxic levels and allow for rounds of transmission. ...Glutamate transporters are essential players in glutamatergic neurotransmission in the brain, where they maintain extracellular glutamate below cytotoxic levels and allow for rounds of transmission. The structural bases of their function are well established, particularly within a model archaeal homolog, sodium, and aspartate symporter Glt. However, the mechanism of gating on the cytoplasmic side of the membrane remains ambiguous. We report Cryo-EM structures of Glt reconstituted into nanodiscs, including those structurally constrained in the cytoplasm-facing state and either apo, bound to sodium ions only, substrate, or blockers. The structures show that both substrate translocation and release involve movements of the bulky transport domain through the lipid bilayer. They further reveal a novel mode of inhibitor binding and show how solutes release is coupled to protein conformational changes. Finally, we describe how domain movements are associated with the displacement of bound lipids and significant membrane deformations, highlighting the potential regulatory role of the bilayer.
History
DepositionMay 18, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 18, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession
Revision 1.2Oct 23, 2024Group: Data collection / Structure summary / Category: em_admin / pdbx_entry_details
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Assembly

Deposited unit
A: Glutamate transporter homologue GltPh
B: Glutamate transporter homologue GltPh
C: Glutamate transporter homologue GltPh
hetero molecules


Theoretical massNumber of molelcules
Total (without water)136,1646
Polymers134,0103
Non-polymers2,1543
Water543
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area7200 Å2
ΔGint-73 kcal/mol
Surface area50640 Å2

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Components

#1: Protein Glutamate transporter homologue GltPh


Mass: 44669.957 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Pyrococcus horikoshii (archaea) / Production host: Escherichia coli (E. coli) / References: UniProt: O59010*PLUS
#2: Chemical ChemComp-6OU / [(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate


Mass: 717.996 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C39H76NO8P / Comment: phospholipid*YM
#3: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN
Has protein modificationN

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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: Complex of GltPh with TBOA in MSP1E3 nanodisc / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.134 MDa / Experimental value: NO
Source (natural)Organism: Pyrococcus horikoshii (archaea)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: YES / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
EM embeddingMaterial: ice
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 69.7 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 3.66 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 88961 / Symmetry type: POINT

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