8XQF

Cryo-EM structure of human monomeric APJR-Gi complex with apelin-13.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.13 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Structural insights into the regulation of monomeric and dimeric apelin receptor.

Yue, Y.Liu, L.Wu, L.Xu, C.Na, M.Liu, S.Liu, Y.Li, F.Liu, J.Shi, S.Lei, H.Zhao, M.Yang, T.Ji, W.Wang, A.Hanson, M.A.Stevens, R.C.Liu, J.Xu, F.

(2025) Nat Commun 16: 310-310

  • DOI: https://doi.org/10.1038/s41467-024-55555-6
  • Primary Citation of Related Structures:  
    8XQE, 8XQF, 8XQI, 8XQJ, 8Z74, 8Z7J

  • PubMed Abstract: 

    The apelin receptor (APJR) emerges as a promising drug target for cardiovascular health and muscle regeneration. While prior research unveiled the structural versatility of APJR in coupling to Gi proteins as a monomer or dimer, the dynamic regulation within the APJR dimer during activation remains poorly understood. In this study, we present the structures of the APJR dimer and monomer complexed with its endogenous ligand apelin-13. In the dimeric structure, apelin-13 binds exclusively to one protomer that is coupled with Gi proteins, revealing a distinct ligand-binding behavior within APJR homodimers. Furthermore, binding of an antagonistic antibody induces a more compact dimerization by engaging both protomers. Notably, structural analyses of the APJR dimer complexed with an agonistic antibody, with or without Gi proteins, suggest that G protein coupling may promote the dissociation of the APJR dimer during activation. These findings underscore the intricate interplay between ligands, dimerization, and G protein coupling in regulating APJR signaling pathways.


  • Organizational Affiliation

    iHuman Institute, ShanghaiTech University, Shanghai, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
G protein subunit alpha i1356Homo sapiensMutation(s): 0 
Gene Names: GNAI1
Membrane Entity: Yes 
UniProt
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UniProt GroupA0A096MZM0
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1340Homo sapiensMutation(s): 0 
Gene Names: GNB1
UniProt & NIH Common Fund Data Resources
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PHAROS:  P62873
GTEx:  ENSG00000078369 
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-271Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Find proteins for P59768 (Homo sapiens)
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PHAROS:  P59768
GTEx:  ENSG00000186469 
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UniProt GroupP59768
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Soluble cytochrome b562,Apelin receptorD [auth R]477Homo sapiensMutation(s): 0 
Gene Names: cybCAPLNRAGTRL1APJ
Membrane Entity: Yes 
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Find proteins for P35414 (Homo sapiens)
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GTEx:  ENSG00000134817 
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UniProt GroupsP0ABE7P35414
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
scFv16E [auth S]259Homo sapiensMutation(s): 0 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Apelin-13F [auth D]13Homo sapiensMutation(s): 0 
Gene Names: APLNAPEL
Membrane Entity: Yes 
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Find proteins for Q9ULZ1 (Homo sapiens)
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PHAROS:  Q9ULZ1
GTEx:  ENSG00000171388 
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UniProt GroupQ9ULZ1
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.13 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2025-01-22
    Type: Initial release