8WGB

mGlu2-4 heterodimer bound with Gi


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis of orientated asymmetry in a mGlu heterodimer.

Huang, W.Jin, N.Guo, J.Shen, C.Xu, C.Xi, K.Bonhomme, L.Quast, R.B.Shen, D.D.Qin, J.Liu, Y.R.Song, Y.Gao, Y.Margeat, E.Rondard, P.Pin, J.P.Zhang, Y.Liu, J.

(2024) Nat Commun 15: 10345-10345

  • DOI: https://doi.org/10.1038/s41467-024-54744-7
  • Primary Citation of Related Structures:  
    8WGB, 8WGC

  • PubMed 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 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.


  • Organizational Affiliation

    Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1A [auth D]339Homo sapiensMutation(s): 0 
Gene Names: GNB1
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PHAROS:  P62873
GTEx:  ENSG00000078369 
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UniProt GroupP62873
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2B [auth E]71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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GTEx:  ENSG00000186469 
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UniProt GroupP59768
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Metabotropic glutamate receptor 2C [auth B]854Homo sapiensMutation(s): 0 
Gene Names: GRM2
Membrane Entity: Yes 
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PHAROS:  Q14416
GTEx:  ENSG00000164082 
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-3D [auth C]354Homo sapiensMutation(s): 0 
Gene Names: GNAI3
Membrane Entity: Yes 
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GTEx:  ENSG00000065135 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Metabotropic glutamate receptor 4E [auth R]880Homo sapiensMutation(s): 0 
Gene Names: GRM4
Membrane Entity: Yes 
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Find proteins for Q14833 (Homo sapiens)
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GTEx:  ENSG00000124493 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China--

Revision History  (Full details and data files)

  • Version 1.0: 2024-10-30
    Type: Initial release
  • Version 1.1: 2024-11-20
    Changes: Data collection
  • Version 1.2: 2024-12-11
    Changes: Data collection, Database references