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- PDB-8ex8: Human S1P transporter Spns2 in an outward-facing partially occlud... -

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Basic information

Entry
Database: PDB / ID: 8ex8
TitleHuman S1P transporter Spns2 in an outward-facing partially occluded conformation (state 2)
ComponentsSphingosine-1-phosphate transporter SPNS2
KeywordsMEMBRANE PROTEIN / transporter
Function / homology
Function and homology information


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
Protein spinster-like / Major facilitator superfamily / Major Facilitator Superfamily / Major facilitator superfamily domain / Major facilitator superfamily (MFS) profile. / MFS transporter superfamily
Similarity search - Domain/homology
Sphingosine-1-phosphate transporter SPNS2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.17 Å
AuthorsAhmed, S. / Zhao, H. / Dai, Y. / Lee, C.H.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM143282 United States
CitationJournal: Cell / Year: 2023
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
DepositionOct 24, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 31, 2023Provider: repository / Type: Initial release
Revision 1.1Jun 7, 2023Group: Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Jun 28, 2023Group: Database references / Category: citation / Item: _citation.journal_volume / _citation.page_first
Revision 1.3Jun 19, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Sphingosine-1-phosphate transporter SPNS2


Theoretical massNumber of molelcules
Total (without water)48,8961
Polymers48,8961
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Sphingosine-1-phosphate transporter SPNS2 / Protein spinster homolog 2


Mass: 48896.184 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SPNS2 / Production host: Homo sapiens (human) / References: UniProt: Q8IVW8

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Human S1P transporter Spns2 in an outward-facing partially occluded conformation (state 2)
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 75 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 4.17 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 583897 / Symmetry type: POINT

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