+
Open data
-
Basic information
Entry | Database: EMDB / ID: EMD-13267 | |||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Title | Cryo EM structure of System XC- | |||||||||||||||||||||||||||||||||
![]() | postprocessed | |||||||||||||||||||||||||||||||||
![]() |
| |||||||||||||||||||||||||||||||||
Function / homology | ![]() cystine:glutamate antiporter activity / regulation of neutrophil apoptotic process / L-kynurenine transmembrane transport / L-kynurenine transmembrane transporter activity / regulation of cysteine metabolic process / regulation of glutathione biosynthetic process / regulation of glutamate metabolic process / regulation of melanin biosynthetic process / regulation of AMPA glutamate receptor clustering / L-cystine transport ...cystine:glutamate antiporter activity / regulation of neutrophil apoptotic process / L-kynurenine transmembrane transport / L-kynurenine transmembrane transporter activity / regulation of cysteine metabolic process / regulation of glutathione biosynthetic process / regulation of glutamate metabolic process / regulation of melanin biosynthetic process / regulation of AMPA glutamate receptor clustering / L-cystine transport / negative regulation of ferroptosis / neutral L-amino acid secondary active transmembrane transporter activity / Defective SLC7A7 causes lysinuric protein intolerance (LPI) / methionine transport / tyrosine transport / L-histidine transport / apical pole of neuron / dipeptide import across plasma membrane / aromatic amino acid transmembrane transporter activity / amino acid transport complex / L-amino acid transmembrane transporter activity / : / L-leucine import across plasma membrane / L-alanine transmembrane transporter activity / isoleucine transport / L-alanine import across plasma membrane / phenylalanine transport / valine transport / L-leucine transmembrane transporter activity / amino acid transmembrane transport / ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||||||||||||||||||||||||||
Biological species | ![]() ![]() | |||||||||||||||||||||||||||||||||
Method | ![]() ![]() | |||||||||||||||||||||||||||||||||
![]() | Parker JL / Deme JC / Lea SM / Newstead S | |||||||||||||||||||||||||||||||||
Funding support | ![]()
| |||||||||||||||||||||||||||||||||
![]() | ![]() Title: Molecular basis for redox control by the human cystine/glutamate antiporter system xc. Authors: Joanne L Parker / Justin C Deme / Dimitrios Kolokouris / Gabriel Kuteyi / Philip C Biggin / Susan M Lea / Simon Newstead / ![]() ![]() Abstract: Cysteine plays an essential role in cellular redox homoeostasis as a key constituent of the tripeptide glutathione (GSH). A rate limiting step in cellular GSH synthesis is the availability of ...Cysteine plays an essential role in cellular redox homoeostasis as a key constituent of the tripeptide glutathione (GSH). A rate limiting step in cellular GSH synthesis is the availability of cysteine. However, circulating cysteine exists in the blood as the oxidised di-peptide cystine, requiring specialised transport systems for its import into the cell. System xc is a dedicated cystine transporter, importing cystine in exchange for intracellular glutamate. To counteract elevated levels of reactive oxygen species in cancerous cells system xc is frequently upregulated, making it an attractive target for anticancer therapies. However, the molecular basis for ligand recognition remains elusive, hampering efforts to specifically target this transport system. Here we present the cryo-EM structure of system xc in both the apo and glutamate bound states. Structural comparisons reveal an allosteric mechanism for ligand discrimination, supported by molecular dynamics and cell-based assays, establishing a mechanism for cystine transport in human cells. | |||||||||||||||||||||||||||||||||
History |
|
-
Structure visualization
Movie |
![]() |
---|---|
Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
-
Downloads & links
-EMDB archive
Map data | ![]() | 117.9 MB | ![]() | |
---|---|---|---|---|
Header (meta data) | ![]() ![]() | 19.9 KB 19.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 11.4 KB | Display | ![]() |
Images | ![]() | 127.7 KB | ||
Masks | ![]() | 125 MB | ![]() | |
Others | ![]() ![]() ![]() | 62.1 MB 116 MB 116 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7p9vMC ![]() 7p9uC C: citing same article ( M: atomic model generated by this map |
---|---|
Similar structure data |
-
Links
EMDB pages | ![]() ![]() |
---|---|
Related items in Molecule of the Month |
-
Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Annotation | postprocessed | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.832 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
|
-Supplemental data
-Mask #1
File | ![]() | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & Slices |
| ||||||||||||
Density Histograms |
-Additional map: #1
File | emd_13267_additional_1.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & Slices |
| ||||||||||||
Density Histograms |
-Half map: halfmap1
File | emd_13267_half_map_1.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Annotation | halfmap1 | ||||||||||||
Projections & Slices |
| ||||||||||||
Density Histograms |
-Half map: halfmap2
File | emd_13267_half_map_2.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Annotation | halfmap2 | ||||||||||||
Projections & Slices |
| ||||||||||||
Density Histograms |
-
Sample components
-Entire : System XC-
Entire | Name: System XC- |
---|---|
Components |
|
-Supramolecule #1: System XC-
Supramolecule | Name: System XC- / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
---|---|
Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
-Macromolecule #1: 4F2 cell-surface antigen heavy chain
Macromolecule | Name: 4F2 cell-surface antigen heavy chain / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
---|---|
Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 69.161867 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MHHHHHHHHE LQPPEASIAV VSIPRQLPGS HSEAGVQGLS AGDDSELGSH CVAQTGLELL ASGDPLPSAS QNAEMIETGS DCVTQAGLQ LLASSDPPAL ASKNAEVTGT MSQDTEVDMK EVELNELEPE KQPMNAASGA AMSLAGAEKN GLVKIKVAED E AEAAAAAK ...String: MHHHHHHHHE LQPPEASIAV VSIPRQLPGS HSEAGVQGLS AGDDSELGSH CVAQTGLELL ASGDPLPSAS QNAEMIETGS DCVTQAGLQ LLASSDPPAL ASKNAEVTGT MSQDTEVDMK EVELNELEPE KQPMNAASGA AMSLAGAEKN GLVKIKVAED E AEAAAAAK FTGLSKEELL KVAGSPGWVR TRWALLLLFW LGWLGMLAGA VVIIVRAPRC RELPAQKWWH TGALYRIGDL QA FQGHGAG NLAGLKGRLD YLSSLKVKGL VLGPIHKNQK DDVAQTDLLQ IDPNFGSKED FDSLLQSAKK KSIRVILDLT PNY RGENSW FSTQVDTVAT KVKDALEFWL QAGVDGFQVR DIENLKDASS FLAEWQNITK GFSEDRLLIA GTNSSDLQQI LSLL ESNKD LLLTSSYLSD SGSTGEHTKS LVTQYLNATG NRWCSWSLSQ ARLLTSFLPA QLLRLYQLML FTLPGTPVFS YGDEI GLDA AALPGQPMEA PVMLWDESSF PDIPGAVSAN MTVKGQSEDP GSLLSLFRRL SDQRSKERSL LHGDFHAFSA GPGLFS YIR HWDQNERFLV VLNFGDVGLS AGLQASDLPA SASLPAKADL LLSTQPGREE GSPLELERLK LEPHEGLLLR FPYAA |
-Macromolecule #2: Cystine/glutamate transporter
Macromolecule | Name: Cystine/glutamate transporter / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
---|---|
Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 56.466605 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MDYKDDDDKV RKPVVSTISK GGYLQGNVNG RLPSLGNKEP PGQEKVQLKR KVTLLRGVSI IIGTIIGAGI FISPKGVLQN TGSVGMSLT IWTVCGVLSL FGALSYAELG TTIKKSGGHY TYILEVFGPL PAFVRVWVEL LIIRPAATAV ISLAFGRYIL E PFFIQCEI ...String: MDYKDDDDKV RKPVVSTISK GGYLQGNVNG RLPSLGNKEP PGQEKVQLKR KVTLLRGVSI IIGTIIGAGI FISPKGVLQN TGSVGMSLT IWTVCGVLSL FGALSYAELG TTIKKSGGHY TYILEVFGPL PAFVRVWVEL LIIRPAATAV ISLAFGRYIL E PFFIQCEI PELAIKLITA VGITVVMVLN SMSVSWSARI QIFLTFCKLT AILIIIVPGV MQLIKGQTQN FKDAFSGRDS SI TRLPLAF YYGMYAYAGW FYLNFVTEEV ENPEKTIPLA ICISMAIVTI GYVLTNVAYF TTINAEELLL SNAVAVTFSE RLL GNFSLA VPIFVALSCF GSMNGGVFAV SRLFYVASRE GHLPEILSMI HVRKHTPLPA VIVLHPLTMI MLFSGDLDSL LNFL SFARW LFIGLAVAGL IYLRYKCPDM HRPFKVPLFI PALFSFTCLF MVALSLYSDP FSTGIGFVIT LTGVPAYYLF IIWDK KPRW FRIMSEKITR TLQIILEVVP EEDKL |
-Experimental details
-Structure determination
Method | ![]() |
---|---|
![]() | ![]() |
Aggregation state | particle |
-
Sample preparation
Buffer | pH: 7.5 |
---|---|
Vitrification | Cryogen name: ETHANE |
-
Electron microscopy
Microscope | FEI TITAN KRIOS |
---|---|
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD![]() |
Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 59.1 e/Å2 |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |