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- PDB-6mpb: Cryo-EM structure of the human neutral amino acid transporter ASCT2 -
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Basic information
Entry | Database: PDB / ID: 6mpb | ||||||
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Title | Cryo-EM structure of the human neutral amino acid transporter ASCT2 | ||||||
![]() | Neutral amino acid transporter B(0) | ||||||
![]() | TRANSPORT PROTEIN / human neutral amino acid transporter / ASCT2 / outward-oriented state / membrane protein | ||||||
Function / homology | ![]() glutamine secretion / L-glutamine import across plasma membrane / glutamine transport / L-glutamine transmembrane transporter activity / L-serine transmembrane transporter activity / ligand-gated channel activity / neutral amino acid transport / amino acid transmembrane transporter activity / L-aspartate transmembrane transporter activity / Amino acid transport across the plasma membrane ...glutamine secretion / L-glutamine import across plasma membrane / glutamine transport / L-glutamine transmembrane transporter activity / L-serine transmembrane transporter activity / ligand-gated channel activity / neutral amino acid transport / amino acid transmembrane transporter activity / L-aspartate transmembrane transporter activity / Amino acid transport across the plasma membrane / L-aspartate import across plasma membrane / neutral L-amino acid transmembrane transporter activity / symporter activity / antiporter activity / amino acid transport / RHOJ GTPase cycle / RHOQ GTPase cycle / protein homotrimerization / RHOH GTPase cycle / transport across blood-brain barrier / RAC3 GTPase cycle / RAC1 GTPase cycle / basal plasma membrane / erythrocyte differentiation / melanosome / virus receptor activity / signaling receptor activity / extracellular exosome / membrane / metal ion binding / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.84 Å | ||||||
![]() | Yu, X. / Han, S. | ||||||
![]() | ![]() Title: Cryo-EM structures of the human glutamine transporter SLC1A5 (ASCT2) in the outward-facing conformation. Authors: Xiaodi Yu / Olga Plotnikova / Paul D Bonin / Timothy A Subashi / Thomas J McLellan / Darren Dumlao / Ye Che / Yin Yao Dong / Elisabeth P Carpenter / Graham M West / Xiayang Qiu / Jeffrey S Culp / Seungil Han / ![]() ![]() Abstract: Alanine-serine-cysteine transporter 2 (ASCT2, SLC1A5) is the primary transporter of glutamine in cancer cells and regulates the mTORC1 signaling pathway. The SLC1A5 function involves finely tuned ...Alanine-serine-cysteine transporter 2 (ASCT2, SLC1A5) is the primary transporter of glutamine in cancer cells and regulates the mTORC1 signaling pathway. The SLC1A5 function involves finely tuned orchestration of two domain movements that include the substrate-binding transport domain and the scaffold domain. Here, we present cryo-EM structures of human SLC1A5 and its complex with the substrate, L-glutamine in an outward-facing conformation. These structures reveal insights into the conformation of the critical ECL2a loop which connects the two domains, thus allowing rigid body movement of the transport domain throughout the transport cycle. Furthermore, the structures provide new insights into substrate recognition, which involves conformational changes in the HP2 loop. A putative cholesterol binding site was observed near the domain interface in the outward-facing state. Comparison with the previously determined inward-facing structure of SCL1A5 provides a basis for a more integrated understanding of substrate recognition and transport mechanism in the SLC1 family. | ||||||
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 222.3 KB | Display | ![]() |
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PDB format | ![]() | 182.3 KB | Display | ![]() |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 9188MC ![]() 9187C ![]() 6mp6C 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: 56638.902 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #2: Chemical | #3: Sugar | |
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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: Ternary complex of SLC1A5 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.170 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.5 |
Specimen | Conc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: unspecified |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE |
Specimen holder | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 1.06 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: dev_2776: / Classification: refinement | |||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.84 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 253220 / Symmetry type: POINT | |||||||||||||||||||||||||||
Refine LS restraints |
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