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- PDB-9m1h: Cryo-EM structure of PGE2-EP1-Gq complex -

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Basic information

Entry
Database: PDB / ID: 9m1h
TitleCryo-EM structure of PGE2-EP1-Gq complex
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • Prostaglandin E2 receptor EP1 subtype
KeywordsMEMBRANE PROTEIN / GPCR / EP1 / PGE2 / Gq
Function / homology
Function and homology information


negative regulation of mucus secretion / prostaglandin E receptor activity / Prostanoid ligand receptors / positive regulation of gonadotropin secretion / phospholipase C-activating tachykinin receptor signaling pathway / Fatty Acids bound to GPR40 (FFAR1) regulate insulin secretion / Acetylcholine regulates insulin secretion / phospholipase C-activating G protein-coupled glutamate receptor signaling pathway / regulation of platelet activation / PLC beta mediated events ...negative regulation of mucus secretion / prostaglandin E receptor activity / Prostanoid ligand receptors / positive regulation of gonadotropin secretion / phospholipase C-activating tachykinin receptor signaling pathway / Fatty Acids bound to GPR40 (FFAR1) regulate insulin secretion / Acetylcholine regulates insulin secretion / phospholipase C-activating G protein-coupled glutamate receptor signaling pathway / regulation of platelet activation / PLC beta mediated events / phospholipase C-activating serotonin receptor signaling pathway / entrainment of circadian clock / sensory perception of itch / positive regulation of membrane depolarization / phototransduction, visible light / regulation of canonical Wnt signaling pathway / glutamate receptor signaling pathway / adenylate cyclase-activating G protein-coupled bile acid receptor signaling pathway / adenylate cyclase-activating serotonin receptor signaling pathway / intracellular transport / regulation of skeletal muscle contraction / hair follicle placode formation / developmental growth / PKA activation in glucagon signalling / renal water homeostasis / postsynaptic cytosol / photoreceptor outer segment / D1 dopamine receptor binding / hormone-mediated signaling pathway / vascular endothelial cell response to laminar fluid shear stress / Hedgehog 'off' state / activation of adenylate cyclase activity / adenylate cyclase-activating adrenergic receptor signaling pathway / cellular response to acidic pH / regulation of eating behavior / adenylate cyclase inhibitor activity / T cell migration / positive regulation of protein localization to cell cortex / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / ovarian follicle development / cellular response to glucagon stimulus / D2 dopamine receptor binding / GTPase activator activity / adenylate cyclase-inhibiting dopamine receptor signaling pathway / adenylate cyclase-inhibiting serotonin receptor signaling pathway / G protein-coupled serotonin receptor binding / Turbulent (oscillatory, disturbed) flow shear stress activates signaling by PIEZO1 and integrins in endothelial cells / regulation of G protein-coupled receptor signaling pathway / intracellular glucose homeostasis / cellular response to forskolin / adenylate cyclase activator activity / regulation of mitotic spindle organization / mast cell degranulation / positive regulation of insulin secretion involved in cellular response to glucose stimulus / chemokine-mediated signaling pathway / positive regulation of insulin secretion / trans-Golgi network membrane / bone development / establishment of mitotic spindle orientation / negative regulation of inflammatory response to antigenic stimulus / neuropeptide signaling pathway / Regulation of insulin secretion / response to prostaglandin E / positive regulation of cholesterol biosynthetic process / platelet aggregation / G protein-coupled receptor binding / blood coagulation / cognition / response to peptide hormone / G-protein beta/gamma-subunit complex binding / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / Olfactory Signaling Pathway / phospholipase C-activating G protein-coupled receptor signaling pathway / Activation of the phototransduction cascade / sensory perception of smell / G protein-coupled acetylcholine receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / GDP binding / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / photoreceptor disc membrane / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / glucose homeostasis / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADP signalling through P2Y purinoceptor 1
Similarity search - Function
Prostanoid EP1 receptor / Prostaglandin DP receptor / Prostanoid receptor / G-protein alpha subunit, group Q / G-protein alpha subunit, group S / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit ...Prostanoid EP1 receptor / Prostaglandin DP receptor / Prostanoid receptor / G-protein alpha subunit, group Q / G-protein alpha subunit, group S / G-protein alpha subunit, group I / G protein alpha subunit, helical insertion / G protein alpha subunit / Guanine nucleotide binding protein (G-protein), alpha subunit / G-protein alpha subunit / G-alpha domain profile. / 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 / Guanine nucleotide-binding protein, beta subunit / G protein beta WD-40 repeat protein / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 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 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Chem-P2E / Prostaglandin E2 receptor EP1 subtype / Guanine nucleotide-binding protein G(q) subunit alpha / 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 / Guanine nucleotide-binding protein G(s) subunit alpha isoforms short / Guanine nucleotide-binding protein G(i) subunit alpha-1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.55 Å
AuthorsMeng, X. / Xu, Y. / Xu, H.E.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81902085 China
CitationJournal: Proc Natl Acad Sci U S A / Year: 2025
Title: Structural insights into the activation of the human prostaglandin E receptor EP1 subtype by prostaglandin E.
Authors: Xue Meng / Yang Li / Jiuyin Xu / Kai Wu / Wen Hu / Canrong Wu / H Eric Xu / Youwei Xu /
Abstract: Prostaglandin E (PGE) mediates diverse physiological processes through four G protein-coupled receptor subtypes (EP1-EP4). While structures of EP2, EP3, and EP4 have been determined, the structural ...Prostaglandin E (PGE) mediates diverse physiological processes through four G protein-coupled receptor subtypes (EP1-EP4). While structures of EP2, EP3, and EP4 have been determined, the structural basis for PGE recognition and activation of the EP1 receptor subtype has remained elusive due to its inherent instability. Here, we present the cryoelectron microscopy structure of the human EP1 receptor in complex with PGE and heterotrimeric Gq protein at 2.55 Å resolution, completing the structural characterization of the EP receptor family. Our structure reveals a unique binding mode of PGE within EP1, involving key interactions with residues in the orthosteric pocket. Notably, we observe a less pronounced outward displacement of transmembrane helix 6 compared to other EP receptor subtypes, suggesting a distinct activation mechanism for EP1. Through extensive mutational analyses, we identify critical residues involved in PGE recognition, EP1 activation, and Gq protein coupling. By overcoming the challenges associated with the instability of EP1, our findings provide valuable insights into the subtype-specific activation mechanisms of EP receptors and lay the foundation for the development of more selective EP1-targeted therapeutics.
History
DepositionFeb 26, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Apr 30, 2025Provider: repository / Type: Initial release
Revision 1.0Apr 30, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Apr 30, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.0Apr 30, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Apr 30, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Nov 12, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Prostaglandin E2 receptor EP1 subtype
B: Guanine nucleotide-binding protein G(i) subunit alpha-1,Guanine nucleotide-binding protein G(s) subunit alpha isoforms short,Guanine nucleotide-binding protein G(q) subunit alpha
C: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)129,7015
Polymers129,3484
Non-polymers3521
Water181
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 1 types, 1 molecules A

#1: Protein Prostaglandin E2 receptor EP1 subtype / PGE receptor EP1 subtype / PGE2 receptor EP1 subtype / Prostanoid EP1 receptor


Mass: 41847.230 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PTGER1 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P34995

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Guanine nucleotide-binding protein ... , 3 types, 3 molecules BCG

#2: Protein Guanine nucleotide-binding protein G(i) subunit alpha-1,Guanine nucleotide-binding protein G(s) subunit alpha isoforms short,Guanine nucleotide-binding protein G(q) subunit alpha / Adenylate cyclase-inhibiting G alpha protein / Adenylate cyclase-stimulating G alpha protein / ...Adenylate cyclase-inhibiting G alpha protein / Adenylate cyclase-stimulating G alpha protein / Guanine nucleotide-binding protein alpha-q


Mass: 41724.383 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAI1, GNAS, GNAS1, GSP, GNAQ, GAQ / Production host: Trichoplusia ni (cabbage looper)
References: UniProt: P63096, UniProt: P63092, UniProt: P50148, Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement
#3: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 37915.496 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNB1 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P62873
#4: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 7861.143 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P59768

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Non-polymers , 2 types, 2 molecules

#5: Chemical ChemComp-P2E / (Z)-7-[(1R,2R,3R)-3-hydroxy-2-[(E,3S)-3-hydroxyoct-1-enyl]-5-oxo-cyclopentyl]hept-5-enoic acid / Prostaglandin E2


Mass: 352.465 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H32O5
#6: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestN
Has protein modificationN

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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: PGE2-EP1-Gq complex / Type: COMPLEX / Entity ID: #1-#4 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 7.5
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 5000 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 30 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 2.55 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 543885 / Symmetry type: POINT

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