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- PDB-6xwp: Structure of glutamate transporter homologue GltTk in unsaturated... -
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Basic information
Entry | Database: PDB / ID: 6xwp | ||||||
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Title | Structure of glutamate transporter homologue GltTk in unsaturated conditions - outward-outward-inward configuration | ||||||
![]() | Proton/glutamate symporter, SDF family | ||||||
![]() | TRANSPORT PROTEIN / AMINO ACID TRANSPORTER / ASPARTATE TRANSPORT / GLUTAMATE TRANSPORTER HOMOLOGUE / MEMBRANE PROTEIN | ||||||
Function / homology | ![]() | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.38 Å | ||||||
![]() | Arkhipova, V. / Slotboom, D.J. / Guskov, A. | ||||||
![]() | ![]() Title: Structural ensemble of a glutamate transporter homologue in lipid nanodisc environment. Authors: Valentina Arkhipova / Albert Guskov / Dirk J Slotboom / ![]() ![]() Abstract: Glutamate transporters are cation-coupled secondary active membrane transporters that clear the neurotransmitter L-glutamate from the synaptic cleft. These transporters are homotrimers, with each ...Glutamate transporters are cation-coupled secondary active membrane transporters that clear the neurotransmitter L-glutamate from the synaptic cleft. These transporters are homotrimers, with each protomer functioning independently by an elevator-type mechanism, in which a mobile transport domain alternates between inward- and outward-oriented states. Using single-particle cryo-EM we have determined five structures of the glutamate transporter homologue Glt, a Na- L-aspartate symporter, embedded in lipid nanodiscs. Dependent on the substrate concentrations used, the protomers of the trimer adopt a variety of asymmetrical conformations, consistent with the independent movement. Six of the 15 resolved protomers are in a hitherto elusive state of the transport cycle in which the inward-facing transporters are loaded with Na ions. These structures explain how substrate-leakage is prevented - a strict requirement for coupled transport. The belt protein of the lipid nanodiscs bends around the inward oriented protomers, suggesting that membrane deformations occur during transport. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 211 KB | Display | ![]() |
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PDB format | ![]() | 172.5 KB | Display | ![]() |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 10634MC ![]() 6xwnC ![]() 6xwoC ![]() 6xwqC ![]() 6xwrC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 45580.203 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: TK0986 / Production host: ![]() ![]() #2: Chemical | Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Trimer of GltTk / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.136 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Microscopy | Model: FEI TECNAI ARCTICA |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 53 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 QUANTUM (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.16_3549: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: NONE | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.38 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 72313 / Symmetry type: POINT | ||||||||||||||||||||||||
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