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 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


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
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  • Reference Sequence
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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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PHAROS:  P41586
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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: GNASGNAS1GSP
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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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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  • Reference Sequence
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