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- EMDB-66136: Cryo-EM structure of the d18:1 S1P-bound S1PR3 and Gq complex -

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Entry
Database: EMDB / ID: EMD-66136
TitleCryo-EM structure of the d18:1 S1P-bound S1PR3 and Gq complex
Map data
Sample
  • Complex: d18:1 S1P-bound S1PR3 in complex with Gq
    • Protein or peptide: Engineered G-alpha-q
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: scFv16
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Nb35
    • Protein or peptide: Sphingosine 1-phosphate receptor 3
  • Ligand: (2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphate
KeywordsGPCR / SBDD / lipid / MEMBRANE PROTEIN
Function / homology
Function and homology information


negative regulation of establishment of endothelial barrier / sphingosine-1-phosphate receptor activity / Lysosphingolipid and LPA receptors / regulation of interleukin-1 beta production / regulation of metabolic process / anatomical structure morphogenesis / Notch signaling pathway / G protein-coupled receptor activity / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / integrin binding ...negative regulation of establishment of endothelial barrier / sphingosine-1-phosphate receptor activity / Lysosphingolipid and LPA receptors / regulation of interleukin-1 beta production / regulation of metabolic process / anatomical structure morphogenesis / Notch signaling pathway / G protein-coupled receptor activity / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / integrin binding / Olfactory Signaling Pathway / adenylate cyclase-activating G protein-coupled receptor signaling pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / ADP signalling through P2Y purinoceptor 1 / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / G-protein beta-subunit binding / cellular response to prostaglandin E stimulus / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / G alpha (12/13) signalling events / presynapse / extracellular vesicle / sensory perception of taste / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / positive regulation of cytosolic calcium ion concentration / retina development in camera-type eye / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / inflammatory response / lysosomal membrane / GTPase activity / positive regulation of cell population proliferation / synapse / lipid binding / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
EDG-3 sphingosine 1-phosphate receptor / Sphingosine 1-phosphate receptor / Serpentine type 7TM GPCR chemoreceptor Srsx / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain ...EDG-3 sphingosine 1-phosphate receptor / Sphingosine 1-phosphate receptor / Serpentine type 7TM GPCR chemoreceptor Srsx / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Sphingosine 1-phosphate receptor 3
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.25 Å
AuthorsIm D / Asada H / Iwata S / Yamauchi M / Hagiwara M
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Proc Natl Acad Sci U S A / Year: 2025
Title: Structural insights into the G-protein subtype selectivity revealed by human sphingosine-1-phosphate receptor 3-G complexes.
Authors: Momono Yamauchi / Dohyun Im / Shintaro Maeda / Tatsuya Ikuta / Masayasu Toyomoto / Hidetsugu Asada / Yukihiko Sugita / Jun-Ichi Kishikawa / Takeshi Noda / Takayuki Kato / Asuka Inoue / So ...Authors: Momono Yamauchi / Dohyun Im / Shintaro Maeda / Tatsuya Ikuta / Masayasu Toyomoto / Hidetsugu Asada / Yukihiko Sugita / Jun-Ichi Kishikawa / Takeshi Noda / Takayuki Kato / Asuka Inoue / So Iwata / Masatoshi Hagiwara /
Abstract: Sphingosine-1-phosphate (S1P) is one of the most extensively studied bioactive lipids that transduces signals via the S1P receptor (S1PR) family (S1PR1-5), a class of G-protein-coupled receptors ...Sphingosine-1-phosphate (S1P) is one of the most extensively studied bioactive lipids that transduces signals via the S1P receptor (S1PR) family (S1PR1-5), a class of G-protein-coupled receptors (GPCRs), to regulate immune cell migration, vascular permeability, and pain modulation. However, the mechanism for achieving specificity in downstream signaling remains poorly understood. Here, we present cryogenic electron microscopic structures of the S1PR3-G complex bound to endogenous agonists: d18:1 S1P or d16:1 S1P. Both agonists shared the same binding pocket and binding mode despite the different signaling intensities of the S1PR3-G signal pathway. By comparing the structures of two agonist-bound complexes, combined with mutagenesis studies, we identified key amino acids, Phe119 and Arg136, that play crucial roles in differential agonist recognition and receptor activation. Furthermore, structural comparisons with previously determined S1PR3-G complex or G-protein-free S1PR3 structures, along with mutagenesis analysis, revealed dynamic intracellular loop 2 conformations and specific amino acid interactions that contribute to G-protein selectivity. Notably, we identified amino acids at the 34.50 and 34.53 positions within ICL2 as critical for specific interactions with G proteins. These findings provide better understanding of the mechanism of GPCR activation and unique perspectives that can be applied to other class A GPCRs, leading to the possibility of optimized drug development.
History
DepositionSep 8, 2025-
Header (metadata) releaseNov 26, 2025-
Map releaseNov 26, 2025-
UpdateNov 26, 2025-
Current statusNov 26, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_66136.png

Downloads & links

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Map

FileDownload / File: emd_66136.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

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AxesX (Sec.)Y (Row.)Z (Col.)
0.88 Å/pix.
x 320 pix.
= 281.6 Å		0.88 Å/pix.
x 320 pix.
= 281.6 Å		0.88 Å/pix.
x 320 pix.
= 281.6 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.88 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 4.5
Minimum - Maximum-39.243935 - 54.039490000000001
Average (Standard dev.)0.000000000005154 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 281.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_66136_additional_1.map
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Half map: #1

Fileemd_66136_half_map_1.map
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Half map: #2

Fileemd_66136_half_map_2.map
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Sample components

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Entire : d18:1 S1P-bound S1PR3 in complex with Gq

EntireName: d18:1 S1P-bound S1PR3 in complex with Gq
Components
  • Complex: d18:1 S1P-bound S1PR3 in complex with Gq
    • Protein or peptide: Engineered G-alpha-q
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: scFv16
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: Nb35
    • Protein or peptide: Sphingosine 1-phosphate receptor 3
  • Ligand: (2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphate

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Supramolecule #1: d18:1 S1P-bound S1PR3 in complex with Gq

SupramoleculeName: d18:1 S1P-bound S1PR3 in complex with Gq / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 190 KDa

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Macromolecule #1: Engineered G-alpha-q

MacromoleculeName: Engineered G-alpha-q / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 27.680387 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: VSAEDKAAAE RSKMIDKNLR EDGEKARRTL RLLLLGADNS GKSTIVKQMR ILHGGSGGSG GTSGIFETKF QVDKVNFHMF DVGGQRDER RKWIQCFNDV TAIIFVVDSS DYNRLQEALN DFKSIWNNRW LRTISVILFL NKQDLLAEKV LAGKSKIEDY F PEFARYTT ...String:
VSAEDKAAAE RSKMIDKNLR EDGEKARRTL RLLLLGADNS GKSTIVKQMR ILHGGSGGSG GTSGIFETKF QVDKVNFHMF DVGGQRDER RKWIQCFNDV TAIIFVVDSS DYNRLQEALN DFKSIWNNRW LRTISVILFL NKQDLLAEKV LAGKSKIEDY F PEFARYTT PEDATPEPGE DPRVTRAKYF IRKEFVDIST ASGDGRHICY PHFTCAVDTE NARRIFNDCK DIILQMNLKE YN LV

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Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.418086 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MHHHHHHLEV LFQGPGSSGS ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLV SASQDGKLII WDSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG H TGYLSCCR ...String:
MHHHHHHLEV LFQGPGSSGS ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLV SASQDGKLII WDSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG H TGYLSCCR FLDDNQIVTS SGDTTCALWD IETGQQTTTF TGHTGDVMSL SLAPDTRLFV SGACDASAKL WDVREGMCRQ TF TGHESDI NAICFFPNGN AFATGSDDAT CRLFDLRADQ ELMTYSHDNI ICGITSVSFS KSGRLLLAGY DDFNCNVWDA LKA DRAGVL AGHDNRVSCL GVTDDGMAVA TGSWDSFLKI WN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #3: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 27.784896 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL KAAAHHHHHH HH

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Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #5: Nb35

MacromoleculeName: Nb35 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 14.016636 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MQVQLQESGG GLVQPGGSLR LSCAASGFTF SNYKMNWVRQ APGKGLEWVS DISQSGASIS YTGSVKGRFT ISRDNAKNTL YLQMNSLKP EDTAVYYCAR CPAPFTRDCF DVTSTTYAYR GQGTQVTVSS

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Macromolecule #6: Sphingosine 1-phosphate receptor 3

MacromoleculeName: Sphingosine 1-phosphate receptor 3 / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.829141 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DYKDDDDKGS HHHHHHHHGS LEVLFQGPAT ALPPRLQPVR GQETLREHYQ YVGKLAGRLK EASEGSTLTT VLFLVICSFI VLENLMVLI AIWKNNKFHN RMYFFIGNLA LCDLLAGIAY KVNILMSGKK TFSLSPTVWF LREGSMFVAL GASTCSLLAI A IERHLTMI ...String:
DYKDDDDKGS HHHHHHHHGS LEVLFQGPAT ALPPRLQPVR GQETLREHYQ YVGKLAGRLK EASEGSTLTT VLFLVICSFI VLENLMVLI AIWKNNKFHN RMYFFIGNLA LCDLLAGIAY KVNILMSGKK TFSLSPTVWF LREGSMFVAL GASTCSLLAI A IERHLTMI KMRPYDANKR HRVFLLIGMC WLIAFTLGAL PILGWNCLHN LPDCSTILPL YSKKYIAFCI SIFTAILVTI VI LYARIYF LVKSSSRKVA NHNNSERSMA LLRTVVIVVS VFIACWSPLF ILFLIDVACR VQACPILFKA QWFIVLAVLN SAM NPVIYT LASKEMRRAF FRLVCN

UniProtKB: Sphingosine 1-phosphate receptor 3

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Macromolecule #7: (2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphate

MacromoleculeName: (2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphate
type: ligand / ID: 7 / Number of copies: 1 / Formula: S1P
Molecular weightTheoretical: 379.472 Da
Chemical component information

ChemComp-S1P:
(2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphate

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration10 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 281.15 K

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 0.8 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7c4s

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.25 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 366554
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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