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- PDB-8ieq: Cryo-EM structure of G-protein free GPR156 -

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Basic information

Entry
Database: PDB / ID: 8ieq
TitleCryo-EM structure of G-protein free GPR156
ComponentsProbable G-protein coupled receptor 156
KeywordsMEMBRANE PROTEIN / G-protein coupled receptor / Signal transduction / Phospholipid
Function / homology
Function and homology information


G protein-coupled GABA receptor activity / G protein-coupled receptor heterodimeric complex / gamma-aminobutyric acid signaling pathway / plasma membrane
Similarity search - Function
GPR156, 7TM domain / GPCR family 3, GABA-B receptor / G-protein coupled receptors family 3 profile. / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR
Similarity search - Domain/homology
: / Probable G-protein coupled receptor 156
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.73 Å
AuthorsShin, J. / Park, J. / Cho, Y.
Funding support Korea, Republic Of, 1items
OrganizationGrant numberCountry
National Research Foundation (NRF, Korea)2021R1A2C301335711 Korea, Republic Of
CitationJournal: Nat Struct Mol Biol / Year: 2024
Title: Constitutive activation mechanism of a class C GPCR.
Authors: Jinwoo Shin / Junhyeon Park / Jieun Jeong / Jordy Homing Lam / Xingyu Qiu / Di Wu / Kuglae Kim / Joo-Youn Lee / Carol V Robinson / Jaekyung Hyun / Vsevolod Katritch / Kwang Pyo Kim / Yunje Cho /
Abstract: Class C G-protein-coupled receptors (GPCRs) are activated through binding of agonists to the large extracellular domain (ECD) followed by rearrangement of the transmembrane domains (TMDs). GPR156, a ...Class C G-protein-coupled receptors (GPCRs) are activated through binding of agonists to the large extracellular domain (ECD) followed by rearrangement of the transmembrane domains (TMDs). GPR156, a class C orphan GPCR, is unique because it lacks an ECD and exhibits constitutive activity. Impaired GPR156-G signaling contributes to loss of hearing. Here we present the cryo-electron microscopy structures of human GPR156 in the G-free and G-coupled states. We found that an endogenous phospholipid molecule is located within each TMD of the GPR156 dimer. Asymmetric binding of Gα to the phospholipid-bound GPR156 dimer restructures the first and second intracellular loops and the carboxy-terminal part of the elongated transmembrane 7 (TM7) without altering dimer conformation. Our findings reveal that GPR156 is a transducer for phospholipid signaling. Constant binding of abundant phospholipid molecules and the G-protein-induced reshaping of the cytoplasmic face provide a basis for the constitutive activation of GPR156.
History
DepositionFeb 15, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 14, 2024Provider: repository / Type: Initial release
Revision 1.1Feb 21, 2024Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name
Revision 2.0Mar 6, 2024Group: Advisory / Atomic model ...Advisory / Atomic model / Author supporting evidence / Data collection / Derived calculations / Non-polymer description / Other / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / chem_comp_atom / chem_comp_bond / entity / pdbx_database_status / pdbx_entity_instance_feature / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_unobs_or_zero_occ_atoms
Item: _atom_site.auth_comp_id / _atom_site.label_comp_id ..._atom_site.auth_comp_id / _atom_site.label_comp_id / _chem_comp.formula / _chem_comp.formula_weight / _chem_comp.id / _chem_comp.mon_nstd_flag / _chem_comp.name / _chem_comp.pdbx_synonyms / _chem_comp.type / _entity.formula_weight / _entity.pdbx_description / _pdbx_database_status.pdb_format_compatible / _pdbx_entity_instance_feature.auth_comp_id / _pdbx_entity_instance_feature.comp_id / _pdbx_entity_nonpoly.comp_id / _pdbx_entity_nonpoly.name / _pdbx_nonpoly_scheme.mon_id / _pdbx_nonpoly_scheme.pdb_mon_id
Revision 2.1May 1, 2024Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 2.2Oct 16, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Probable G-protein coupled receptor 156
B: Probable G-protein coupled receptor 156
C: Probable G-protein coupled receptor 156
D: Probable G-protein coupled receptor 156
hetero molecules


Theoretical massNumber of molelcules
Total (without water)265,5548
Polymers262,5144
Non-polymers3,0404
Water00
1


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

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Components

#1: Protein
Probable G-protein coupled receptor 156 / G-protein coupled receptor PGR28 / GABAB-related G-protein coupled receptor


Mass: 65628.484 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GPR156 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: Q8NFN8
#2: Chemical
ChemComp-A1LYA / [(2R)-3-[(E)-hexadec-9-enoyl]oxy-2-octadecanoyloxy-propyl] 2-(trimethylazaniumyl)ethyl phosphate


Mass: 760.076 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C42H82NO8P / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
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: G-protein free GPR156 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 262.4 kDa/nm / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
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: FEI TITAN KRIOS
Electron gunElectron source: OTHER / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: OTHER / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 64 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.73 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 493410 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0049081
ELECTRON MICROSCOPYf_angle_d0.63112320
ELECTRON MICROSCOPYf_dihedral_angle_d23.5051324
ELECTRON MICROSCOPYf_chiral_restr0.0391514
ELECTRON MICROSCOPYf_plane_restr0.0051437

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