8E3X image
Entry Detail
PDB ID:
8E3X
EMDB ID:
EMD-27872
Keywords:
MEMBRANE PROTEIN
Title:
Cryo-EM structure of the PAC1R-PACAP27-Gs complex
Biological Source:
Source Organism:
Homo sapiens, Lama glama
Host Organism:
Trichoplusia ni
PDB Version:
Deposition Date:
2022-08-17
Release Date:
2022-11-23
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
2.30 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
8E3X validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
Chain IDs:A
Chain Length:394
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P63092 Pfam ID:PF00503
Protein Blast
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Chain IDs:B
Chain Length:350
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P62873 Pfam ID:PF00400
Protein Blast
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Chain IDs:C (auth: G)
Chain Length:71
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P59768 Pfam ID:PF00631
Polymer Type:polypeptide(L)
Description:Nanobody35
Chain IDs:D (auth: N)
Chain Length:138
Number of Molecules:1
Biological Source:Lama glama
Protein Blast
Polymer Type:polypeptide(L)
Description:Pituitary adenylate cyclase-activating polypeptide
Chain IDs:E (auth: P)
Chain Length:27
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P18509 Pfam ID:PF00123
Protein Blast
Polymer Type:polypeptide(L)
Description:Pituitary adenylate cyclase-activating polypeptide type I receptor
Chain IDs:F (auth: R)
Chain Length:483
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P41586 Pfam ID:PF02793, PF00002
Primary Citation
Understanding VPAC receptor family peptide binding and selectivity.
Nat Commun 13 7013 7013 (2022)
PMID: 36385145 DOI: 10.1038/s41467-022-34629-3

Abstact

The vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) receptors are key regulators of neurological processes. Despite recent structural data, a comprehensive understanding of peptide binding and selectivity among different subfamily receptors is lacking. Here, we determine structures of active, Gs-coupled, VIP-VPAC1R, PACAP27-VPAC1R, and PACAP27-PAC1R complexes. Cryo-EM structural analyses and molecular dynamics simulations (MDSs) reveal fewer stable interactions between VPAC1R and VIP than for PACAP27, more extensive dynamics of VIP interaction with extracellular loop 3, and receptor-dependent differences in interactions of conserved N-terminal peptide residues with the receptor core. MD of VIP modelled into PAC1R predicts more transient VIP-PAC1R interactions in the receptor core, compared to VIP-VPAC1R, which may underlie the selectivity of VIP for VPAC1R over PAC1R. Collectively, our work improves molecular understanding of peptide engagement with the PAC1R and VPAC1R that may benefit the development of novel selective agonists.

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Primary Citation of related structures
8E3X