7E9H

Cryo-EM structure of Gi-bound metabotropic glutamate receptor mGlu4


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structures of G i -bound metabotropic glutamate receptors mGlu2 and mGlu4.

Lin, S.Han, S.Cai, X.Tan, Q.Zhou, K.Wang, D.Wang, X.Du, J.Yi, C.Chu, X.Dai, A.Zhou, Y.Chen, Y.Zhou, Y.Liu, H.Liu, J.Yang, D.Wang, M.W.Zhao, Q.Wu, B.

(2021) Nature 594: 583-588

  • DOI: 10.1038/s41586-021-03495-2
  • Primary Citation of Related Structures:  
    7E9G, 7E9H

  • PubMed Abstract: 
  • The metabotropic glutamate receptors (mGlus) have key roles in modulating cell excitability and synaptic transmission in response to glutamate (the main excitatory neurotransmitter in the central nervous system) 1 . It has previously been suggested that only one receptor subunit within an mGlu homodimer is responsible for coupling to G protein during receptor activation 2 ...

    The metabotropic glutamate receptors (mGlus) have key roles in modulating cell excitability and synaptic transmission in response to glutamate (the main excitatory neurotransmitter in the central nervous system) 1 . It has previously been suggested that only one receptor subunit within an mGlu homodimer is responsible for coupling to G protein during receptor activation 2 . However, the molecular mechanism that underlies the asymmetric signalling of mGlus remains unknown. Here we report two cryo-electron microscopy structures of human mGlu2 and mGlu4 bound to heterotrimeric G i protein. The structures reveal a G-protein-binding site formed by three intracellular loops and helices III and IV that is distinct from the corresponding binding site in all of the other G-protein-coupled receptor (GPCR) structures. Furthermore, we observed an asymmetric dimer interface of the transmembrane domain of the receptor in the two mGlu-G i structures. We confirmed that the asymmetric dimerization is crucial for receptor activation, which was supported by functional data; this dimerization may provide a molecular basis for the asymmetric signal transduction of mGlus. These findings offer insights into receptor signalling of class C GPCRs.


    Organizational Affiliation

    School of Pharmaceutical Science and Technology, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China. beiliwu@simm.ac.cn.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Metabotropic glutamate receptor 4A [auth R],
B [auth S]
890Homo sapiensMutation(s): 0 
Gene Names: GRM4GPRC1DMGLUR4
Membrane Entity: Yes 
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PHAROS:  Q14833
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UniProt GroupQ14833
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-3C [auth A]354Homo sapiensMutation(s): 5 
Gene Names: GNAI3
Membrane Entity: Yes 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1D [auth B]351Homo sapiensMutation(s): 0 
Gene Names: GNB1
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2E [auth C]71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
scFv16F [auth D]257Homo sapiensMutation(s): 0 
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Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SEP (Subject of Investigation/LOI)
Query on SEP

Download Ideal Coordinates CCD File 
G [auth R],
H [auth S]
PHOSPHOSERINE
C3 H8 N O6 P
BZQFBWGGLXLEPQ-REOHCLBHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, China)China31825010
National Science Foundation (NSF, China)China81525024
National Science Foundation (NSF, China)China81872915
National Science Foundation (NSF, China)China81773792
National Science Foundation (NSF, China)China81973373

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-23
    Type: Initial release
  • Version 1.1: 2021-07-07
    Changes: Database references