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- PDB-8zfz: cryo-EM structure of Gs-coupled zebrafish GPR4 at pH 6.5 -

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Basic information

Entry
Database: PDB / ID: 8zfz
Titlecryo-EM structure of Gs-coupled zebrafish GPR4 at pH 6.5
Components
  • 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
  • Soluble cytochrome b562,G-protein coupled receptor 4,LgBiT
  • scFv16
KeywordsSIGNALING PROTEIN / GPCR / membrane protein.
Function / homology
Function and homology information


response to acidic pH / cellular response to acidic pH / PKA activation in glucagon signalling / developmental growth / hair follicle placode formation / D1 dopamine receptor binding / intracellular transport / vascular endothelial cell response to laminar fluid shear stress / renal water homeostasis / activation of adenylate cyclase activity ...response to acidic pH / cellular response to acidic pH / PKA activation in glucagon signalling / developmental growth / hair follicle placode formation / D1 dopamine receptor binding / intracellular transport / vascular endothelial cell response to laminar fluid shear stress / renal water homeostasis / activation of adenylate cyclase activity / Hedgehog 'off' state / adenylate cyclase-activating adrenergic receptor signaling pathway / cellular response to glucagon stimulus / regulation of insulin secretion / adenylate cyclase activator activity / trans-Golgi network membrane / negative regulation of inflammatory response to antigenic stimulus / electron transport chain / G protein-coupled receptor activity / bone development / G-protein beta/gamma-subunit complex binding / platelet aggregation / cognition / Olfactory 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 / adenylate cyclase-activating G protein-coupled receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / 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 / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / sensory perception of smell / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / positive regulation of cold-induced thermogenesis / retina development in camera-type eye / G protein activity / 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 / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / Ras protein signal transduction / periplasmic space / electron transfer activity / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / iron ion binding / lysosomal membrane / GTPase activity / heme binding / synapse / GTP binding / protein-containing complex binding / signal transduction / extracellular exosome / metal ion binding / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
G protein-coupled receptor 4 orphan / G-protein alpha subunit, group S / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit ...G protein-coupled receptor 4 orphan / G-protein alpha subunit, group S / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / 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 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
G-protein coupled receptor 4 / Soluble cytochrome b562 / 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
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
Escherichia coli (E. coli)
Danio rerio (zebrafish)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsMa, Y. / Tang, M. / Ru, H. / Song, G.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32171215 China
CitationJournal: Nat Commun / Year: 2025
Title: Cryo-EM structure of an activated GPR4-Gs signaling complex.
Authors: Yitong Ma / Yijie Wang / Mengyuan Tang / Yuan Weng / Ying Chen / Yueming Xu / Shuxiao An / Yiran Wu / Suwen Zhao / Huanhuan Xu / Dali Li / Mingyao Liu / Weiqiang Lu / Heng Ru / Gaojie Song /
Abstract: G protein-coupled receptor 4 (GPR4) belongs to the subfamily of proton-sensing GPCRs (psGPCRs), which detect pH changes in extracellular environment and regulate diverse physiological responses. GPR4 ...G protein-coupled receptor 4 (GPR4) belongs to the subfamily of proton-sensing GPCRs (psGPCRs), which detect pH changes in extracellular environment and regulate diverse physiological responses. GPR4 was found to be overactivated in acidic tumor microenvironment as well as inflammation sites, with a triad of acidic residues within the transmembrane domain identified as crucial for proton sensing. However, the 3D structure remains unknown, and the roles of other conserved residues within psGPCRs are not well understood. Here we report cryo-electron microscopy (cryo-EM) structures of active zebrafish GPR4 at both pH 6.5 and 8.5, each highlighting a distribution of histidine and acidic residues at the extracellular region. Cell-based assays show that these ionizable residues moderately influence the proton-sensing capacity of zebrafish GPR4, compared to the more significant effects of the triad residues. Furthermore, we reveal a cluster of aromatic residues within the orthosteric pocket that may propagate the signaling to the intercellular region via repacking the aromatic patch at the central region. This study provides a framework for future signaling and functional investigation of psGPCRs.
History
DepositionMay 8, 2024Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Jan 22, 2025Provider: repository / Type: Initial release
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Revision 1.1Jul 23, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 23, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
D: scFv16
A: Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
R: Soluble cytochrome b562,G-protein coupled receptor 4,LgBiT
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2


Theoretical massNumber of molelcules
Total (without water)178,9045
Polymers178,9045
Non-polymers00
Water00
1


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

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Components

#1: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 39728.426 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1, with C-terminal smBIT tag
Source: (gene. exp.) Homo sapiens (human) / Gene: GNB1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P62873
#2: Antibody scFv16


Mass: 30765.471 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Spodoptera frugiperda (fall armyworm)
#3: Protein Guanine nucleotide-binding protein G(s) subunit alpha isoforms short / Adenylate cyclase-stimulating G alpha protein


Mass: 28362.049 Da / Num. of mol.: 1 / Mutation: G49D, E50N, A249D, S252D, L272D, I372A, V375I
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAS, GNAS1, GSP / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P63092
#4: Protein Soluble cytochrome b562,G-protein coupled receptor 4,LgBiT / Cytochrome b-562


Mass: 72372.461 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli), (gene. exp.) Danio rerio (zebrafish), (gene. exp.) synthetic construct (others)
Gene: cybC, gpr4 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P0ABE7, UniProt: E7FEL0
#5: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 7675.814 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P59768
Has protein modificationY

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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: zGPR4-Gs complex / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Danio rerio (zebrafish)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 6.5
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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 52 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 183055 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0049267
ELECTRON MICROSCOPYf_angle_d0.70812566
ELECTRON MICROSCOPYf_dihedral_angle_d5.0991261
ELECTRON MICROSCOPYf_chiral_restr0.0441403
ELECTRON MICROSCOPYf_plane_restr0.0051604

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