6MPB

Cryo-EM structure of the human neutral amino acid transporter ASCT2

Summary for 6MPB

• Entry DOI: 10.2210/pdb6mpb/pdb
• EMDB information: 9187 9188
• Descriptor: Neutral amino acid transporter B(0), GLUTAMINE, 2-acetamido-2-deoxy-beta-D-glucopyranose (3 entities in total)
• Functional Keywords: human neutral amino acid transporter, asct2, outward-oriented state, membrane protein, transport protein
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 3
• Total formula weight: 171018.76

Authors

Yu, X.,Han, S. (deposition date: 2018-10-05, release date: 2019-11-06, Last modification date: 2020-07-29)

Primary citation

Yu, X.,Plotnikova, O.,Bonin, P.D.,Subashi, T.A.,McLellan, T.J.,Dumlao, D.,Che, Y.,Dong, Y.Y.,Carpenter, E.P.,West, G.M.,Qiu, X.,Culp, J.S.,Han, S.
Cryo-EM structures of the human glutamine transporter SLC1A5 (ASCT2) in the outward-facing conformation.
Elife, 8:-, 2019

PubMed 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 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.

PubMed: 31580259
DOI: 10.7554/eLife.48120

Experimental method

ELECTRON MICROSCOPY (3.84 Å)