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- PDB-8ex8: Human S1P transporter Spns2 in an outward-facing partially occlud... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8ex8 | ||||||
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Title | Human S1P transporter Spns2 in an outward-facing partially occluded conformation (state 2) | ||||||
![]() | Sphingosine-1-phosphate transporter SPNS2 | ||||||
![]() | MEMBRANE PROTEIN / transporter | ||||||
Function / homology | ![]() regulation of eye pigmentation / regulation of humoral immune response / regulation of T cell migration / sphingolipid transporter activity / lymphocyte migration / sphingolipid biosynthetic process / Sphingolipid de novo biosynthesis / sphingosine-1-phosphate receptor signaling pathway / lipid transport / T cell homeostasis ...regulation of eye pigmentation / regulation of humoral immune response / regulation of T cell migration / sphingolipid transporter activity / lymphocyte migration / sphingolipid biosynthetic process / Sphingolipid de novo biosynthesis / sphingosine-1-phosphate receptor signaling pathway / lipid transport / T cell homeostasis / B cell homeostasis / transmembrane transporter activity / lymph node development / sensory perception of sound / bone development / endosome membrane / membrane / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.17 Å | ||||||
![]() | Ahmed, S. / Zhao, H. / Dai, Y. / Lee, C.H. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural and functional insights into Spns2-mediated transport of sphingosine-1-phosphate. Authors: Hongwen Chen / Shahbaz Ahmed / Hongtu Zhao / Nadia Elghobashi-Meinhardt / Yaxin Dai / Jae Hun Kim / Jeffrey G McDonald / Xiaochun Li / Chia-Hsueh Lee / ![]() ![]() Abstract: Sphingosine-1-phosphate (S1P) is an important signaling sphingolipid that regulates the immune system, angiogenesis, auditory function, and epithelial and endothelial barrier integrity. Spinster ...Sphingosine-1-phosphate (S1P) is an important signaling sphingolipid that regulates the immune system, angiogenesis, auditory function, and epithelial and endothelial barrier integrity. Spinster homolog 2 (Spns2) is an S1P transporter that exports S1P to initiate lipid signaling cascades. Modulating Spns2 activity can be beneficial in treatments of cancer, inflammation, and immune diseases. However, the transport mechanism of Spns2 and its inhibition remain unclear. Here, we present six cryo-EM structures of human Spns2 in lipid nanodiscs, including two functionally relevant intermediate conformations that link the inward- and outward-facing states, to reveal the structural basis of the S1P transport cycle. Functional analyses suggest that Spns2 exports S1P via facilitated diffusion, a mechanism distinct from other MFS lipid transporters. Finally, we show that the Spns2 inhibitor 16d attenuates the transport activity by locking Spns2 in the inward-facing state. Our work sheds light on Spns2-mediated S1P transport and aids the development of advanced Spns2 inhibitors. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 80.9 KB | Display | ![]() |
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PDB format | ![]() | 60.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 28.4 KB | Display | |
Data in CIF | ![]() | 37.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 28654MC ![]() 8ex4C ![]() 8ex5C ![]() 8ex6C ![]() 8ex7C ![]() 8g92C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
#1: Protein | Mass: 48896.184 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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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: Human S1P transporter Spns2 in an outward-facing partially occluded conformation (state 2) Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7 |
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: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 600 nm |
Image recording | Electron dose: 75 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: NONE |
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3D reconstruction | Resolution: 4.17 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 583897 / Symmetry type: POINT |