6LPB

Cryo-EM structure of the human PAC1 receptor coupled to an engineered heterotrimeric G protein

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Literature

Cryo-EM structure of the human PAC1 receptor coupled to an engineered heterotrimeric G protein.

Kobayashi, K., Shihoya, W., Nishizawa, T., Kadji, F.M.N., Aoki, J., Inoue, A., Nureki, O.

(2020) Nat Struct Mol Biol 27: 274-280

  • DOI: 10.1038/s41594-020-0386-8
  • Primary Citation of Related Structures:  
    6LPB

  • PubMed Abstract: 

    • Pituitary adenylate cyclase-activating polypeptide (PACAP) is a pleiotropic neuropeptide hormone. The PACAP receptor PAC1R, which belongs to the class B G-protein-coupled receptors (GPCRs), is a drug target for mental disorders and dry eye syndrome. Here, we present a cryo-EM structure of human PAC1R bound to PACAP and an engineered G s heterotrimer ...

    Pituitary adenylate cyclase-activating polypeptide (PACAP) is a pleiotropic neuropeptide hormone. The PACAP receptor PAC1R, which belongs to the class B G-protein-coupled receptors (GPCRs), is a drug target for mental disorders and dry eye syndrome. Here, we present a cryo-EM structure of human PAC1R bound to PACAP and an engineered G s heterotrimer. The structure revealed that transmembrane helix TM1 plays an essential role in PACAP recognition. The extracellular domain (ECD) of PAC1R tilts by ~40° compared with that of the glucagon-like peptide-1 receptor (GLP-1R) and thus does not cover the peptide ligand. A functional analysis demonstrated that the PAC1R ECD functions as an affinity trap and is not required for receptor activation, whereas the GLP-1R ECD plays an indispensable role in receptor activation, illuminating the functional diversity of the ECDs in class B GPCRs. Our structural information will facilitate the design and improvement of better PAC1R agonists for clinical applications.

    Organizational Affiliation: 

    Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo, Tokyo, Japan. nureki@bs.s.u-tokyo.ac.jp.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Pituitary adenylate cyclase-activating polypeptide P38Homo sapiensMutation(s): 0 
Gene Names: ADCYAP1
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
G Protein-Coupled Receptors: Class B1		Protein: 
PAC1 receptor coupled to engineered heterotrimeric G protein
Find proteins for P18509 (Homo sapiens)
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PHAROS:  P18509
GTEx:  ENSG00000141433
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Pituitary adenylate cyclase-activating polypeptide type I receptor R403Homo sapiensMutation(s): 0 
Gene Names: ADCYAP1R1
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
G Protein-Coupled Receptors: Class B1		Protein: 
PAC1 receptor coupled to engineered heterotrimeric G protein
Find proteins for P41586 (Homo sapiens)
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Go to UniProtKB:  P41586
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PHAROS:  P41586
GTEx:  ENSG00000078549
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 B351Rattus norvegicusMutation(s): 0 
Gene Names: Gnb1
Find proteins for P54311 (Rattus norvegicus)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(s) subunit alpha isoforms short,Guanine nucleotide-binding protein G(s) subunit alpha isoforms short A249Homo sapiensMutation(s): 0 
Gene Names: GNAS, GNAS1, GSP
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
G Protein-Coupled Receptors: Class B1		Protein: 
PAC1 receptor coupled to engineered heterotrimeric G protein
Find proteins for P63092 (Homo sapiens)
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PHAROS:  P63092
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
nanobody Nb35 N137unidentifiedMutation(s): 0 
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 G68Bos taurusMutation(s): 0 
Gene Names: GNG2
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
G Protein-Coupled Receptors: Class B1		Protein: 
PAC1 receptor coupled to engineered heterotrimeric G protein
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 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: 2020-03-11
    Type: Initial release
  • Version 1.1: 2020-03-25
    Changes: Database references