7EB2

Cryo-EM structure of human GABA(B) receptor-Gi protein complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 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 GABA B receptor-G i protein coupling.

Shen, C.Mao, C.Xu, C.Jin, N.Zhang, H.Shen, D.D.Shen, Q.Wang, X.Hou, T.Chen, Z.Rondard, P.Pin, J.P.Zhang, Y.Liu, J.

(2021) Nature 594: 594-598

  • DOI: 10.1038/s41586-021-03507-1
  • Primary Citation of Related Structures:  
    7EB2

  • PubMed Abstract: 
  • G-protein-coupled receptors (GPCRs) have central roles in intercellular communication 1,2 . Structural studies have revealed how GPCRs can activate G proteins. However, whether this mechanism is conserved among all classes of GPCR remains unknown ...

    G-protein-coupled receptors (GPCRs) have central roles in intercellular communication 1,2 . Structural studies have revealed how GPCRs can activate G proteins. However, whether this mechanism is conserved among all classes of GPCR remains unknown. Here we report the structure of the class-C heterodimeric GABA B receptor, which is activated by the inhibitory transmitter GABA, in its active form complexed with G i1 protein. We found that a single G protein interacts with the GB2 subunit of the GABA B receptor at a site that mainly involves intracellular loop 2 on the side of the transmembrane domain. This is in contrast to the G protein binding in a central cavity, as has been observed with other classes of GPCR. This binding mode results from the active form of the transmembrane domain of this GABA B receptor being different from that of other GPCRs, as it shows no outside movement of transmembrane helix 6. Our work also provides details of the inter- and intra-subunit changes that link agonist binding to G-protein activation in this heterodimeric complex.


    Organizational Affiliation

    Bioland Laboratory, Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, China. jfliu@mail.hust.edu.cn.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-1A354Homo sapiensMutation(s): 4 
Gene Names: GNAI1
Membrane Entity: Yes 
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1B358Homo sapiensMutation(s): 0 
Gene Names: GNB1
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Find proteins for P62873 (Homo sapiens)
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PHAROS:  P62873
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2C [auth Y]71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
ScFv16D [auth N]269synthetic constructMutation(s): 0 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-aminobutyric acid type B receptor subunit 1E [auth C]937Homo sapiensMutation(s): 0 
Gene Names: GABBR1GPRC3A
Membrane Entity: Yes 
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-aminobutyric acid type B receptor subunit 2F [auth D]808Homo sapiensMutation(s): 0 
Gene Names: GABBR2GPR51GPRC3B
Membrane Entity: Yes 
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FN0 (Subject of Investigation/LOI)
Query on FN0

Download Ideal Coordinates CCD File 
H [auth D](3S)-5,7-ditert-butyl-3-oxidanyl-3-(trifluoromethyl)-1-benzofuran-2-one
C17 H21 F3 O3
RVNOANDLZIIFHB-INIZCTEOSA-N
 Ligand Interaction
2C0 (Subject of Investigation/LOI)
Query on 2C0

Download Ideal Coordinates CCD File 
G [auth C]baclofen
C10 H12 Cl N O2
KPYSYYIEGFHWSV-QMMMGPOBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-05
    Type: Initial release
  • Version 1.1: 2021-05-12
    Changes: Database references
  • Version 1.2: 2021-07-07
    Changes: Database references