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- PDB-8wgd: mGlu2-4 inactive heterodimer -

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Basic information

Entry
Database: PDB / ID: 8wgd
TitlemGlu2-4 inactive heterodimer
Components
  • Metabotropic glutamate receptor 2
  • Metabotropic glutamate receptor 4
KeywordsMEMBRANE PROTEIN / GPCR
Function / homology
Function and homology information


adenylate cyclase-inhibiting G protein-coupled glutamate receptor signaling pathway / regulation of response to drug / group II metabotropic glutamate receptor activity / adenylate cyclase inhibiting G protein-coupled glutamate receptor activity / intracellular glutamate homeostasis / behavioral response to nicotine / neurotransmitter secretion / G protein-coupled glutamate receptor signaling pathway / negative regulation of adenylate cyclase activity / astrocyte projection ...adenylate cyclase-inhibiting G protein-coupled glutamate receptor signaling pathway / regulation of response to drug / group II metabotropic glutamate receptor activity / adenylate cyclase inhibiting G protein-coupled glutamate receptor activity / intracellular glutamate homeostasis / behavioral response to nicotine / neurotransmitter secretion / G protein-coupled glutamate receptor signaling pathway / negative regulation of adenylate cyclase activity / astrocyte projection / Class C/3 (Metabotropic glutamate/pheromone receptors) / glutamate receptor activity / glutamate secretion / long-term synaptic depression / regulation of glutamate secretion / cellular response to stress / regulation of dopamine secretion / regulation of synaptic transmission, glutamatergic / regulation of neuron apoptotic process / calcium channel regulator activity / presynaptic modulation of chemical synaptic transmission / response to cocaine / G protein-coupled receptor activity / Sensory perception of sweet, bitter, and umami (glutamate) taste / presynapse / presynaptic membrane / cytoplasmic vesicle / scaffold protein binding / G alpha (i) signalling events / gene expression / chemical synaptic transmission / postsynaptic membrane / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / positive regulation of MAPK cascade / axon / dendrite / glutamatergic synapse / plasma membrane
Similarity search - Function
GPCR, family 3, metabotropic glutamate receptor 4 / GPCR, family 3, metabotropic glutamate receptor 2 / GPCR, family 3, metabotropic glutamate receptor / : / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / G-protein coupled receptors family 3 signature 3. ...GPCR, family 3, metabotropic glutamate receptor 4 / GPCR, family 3, metabotropic glutamate receptor 2 / GPCR, family 3, metabotropic glutamate receptor / : / G-protein coupled receptors family 3 signature 1. / G-protein coupled receptors family 3 signature 2. / GPCR, family 3, nine cysteines domain / GPCR, family 3, nine cysteines domain superfamily / Nine Cysteines Domain of family 3 GPCR / G-protein coupled receptors family 3 signature 3. / GPCR, family 3, conserved site / GPCR, family 3 / G-protein coupled receptors family 3 profile. / GPCR family 3, C-terminal / 7 transmembrane sweet-taste receptor of 3 GCPR / Receptor, ligand binding region / Receptor family ligand binding region / Periplasmic binding protein-like I
Similarity search - Domain/homology
: / : / Metabotropic glutamate receptor 2 / Metabotropic glutamate receptor 4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.45 Å
AuthorsZhang, Y. / Liu, J.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Commun / Year: 2024
Title: Structural basis of orientated asymmetry in a mGlu heterodimer.
Authors: Weizhu Huang / Nan Jin / Jia Guo / Cangsong Shen / Chanjuan Xu / Kun Xi / Léo Bonhomme / Robert B Quast / Dan-Dan Shen / Jiao Qin / Yi-Ru Liu / Yuxuan Song / Yang Gao / Emmanuel Margeat / ...Authors: Weizhu Huang / Nan Jin / Jia Guo / Cangsong Shen / Chanjuan Xu / Kun Xi / Léo Bonhomme / Robert B Quast / Dan-Dan Shen / Jiao Qin / Yi-Ru Liu / Yuxuan Song / Yang Gao / Emmanuel Margeat / Philippe Rondard / Jean-Philippe Pin / Yan Zhang / Jianfeng Liu /
Abstract: The structural basis for the allosteric interactions within G protein-coupled receptors (GPCRs) heterodimers remains largely unknown. The metabotropic glutamate (mGlu) receptors are complex dimeric ...The structural basis for the allosteric interactions within G protein-coupled receptors (GPCRs) heterodimers remains largely unknown. The metabotropic glutamate (mGlu) receptors are complex dimeric GPCRs important for the fine tuning of many synapses. Heterodimeric mGlu receptors with specific allosteric properties have been identified in the brain. Here we report four cryo-electron microscopy structures of mGlu2-4 heterodimer in different states: an inactive state bound to antagonists, two intermediate states bound to either mGlu2 or mGlu4 agonist only and an active state bound to both glutamate and a mGlu4 positive allosteric modulator (PAM) in complex with Gi protein. In addition to revealing a unique PAM binding pocket among mGlu receptors, our data bring important information for the asymmetric activation of mGlu heterodimers. First, we show that agonist binding to a single subunit in the extracellular domain is not sufficient to stabilize an active dimer conformation. Single-molecule FRET data show that the monoliganded mGlu2-4 can be found in both intermediate states and an active one. Second, we provide a detailed view of the asymmetric interface in seven-transmembrane (7TM) domains and identified key residues within the mGlu2 7TM that limits its activation leaving mGlu4 as the only subunit activating G proteins.
History
DepositionSep 20, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 27, 2024Provider: repository / Type: Initial release
Revision 1.1May 28, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
C: Metabotropic glutamate receptor 2
B: Metabotropic glutamate receptor 4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)192,8514
Polymers192,2272
Non-polymers6252
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 Metabotropic glutamate receptor 2


Mass: 93861.367 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GRM2 / Production host: Homo sapiens (human) / References: UniProt: Q14416
#2: Protein Metabotropic glutamate receptor 4


Mass: 98365.320 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GRM4 / Production host: Homo sapiens (human) / References: UniProt: Q14833
#3: Chemical ChemComp-WAG / (1S,2R)-2-[(2S)-2-azanyl-1-oxidanyl-1-oxidanylidene-3-(9H-xanthen-9-yl)propan-2-yl]cyclopropane-1-carboxylic acid


Mass: 353.369 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H19NO5 / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-WA6 / (2S)-2-azanyl-2-cyclopropyl-2-(4-phosphonophenyl)ethanoic acid


Mass: 271.206 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C11H14NO5P / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
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: mGlu2-4 inactive heterodimer / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 600 nm
Image recordingElectron dose: 52 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 4.45 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 94971 / Symmetry type: POINT

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