7T96

Cryo-EM structure of S2 state ACh-bound M2R-Go signaling complex with a PAM


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.22 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

Structural and dynamic insights into supra-physiological activation and allosteric modulation of a muscarinic acetylcholine receptor.

Xu, J.Wang, Q.Hubner, H.Hu, Y.Niu, X.Wang, H.Maeda, S.Inoue, A.Tao, Y.Gmeiner, P.Du, Y.Jin, C.Kobilka, B.K.

(2023) Nat Commun 14: 376-376

  • DOI: https://doi.org/10.1038/s41467-022-35726-z
  • Primary Citation of Related Structures:  
    7T8X, 7T90, 7T94, 7T96

  • PubMed Abstract: 

    The M2 muscarinic receptor (M2R) is a prototypical G-protein-coupled receptor (GPCR) that serves as a model system for understanding GPCR regulation by both orthosteric and allosteric ligands. Here, we investigate the mechanisms governing M2R signaling versatility using cryo-electron microscopy (cryo-EM) and NMR spectroscopy, focusing on the physiological agonist acetylcholine and a supra-physiological agonist iperoxo, as well as a positive allosteric modulator LY2119620. These studies reveal that acetylcholine stabilizes a more heterogeneous M2R-G-protein complex than iperoxo, where two conformers with distinctive G-protein orientations were determined. We find that LY2119620 increases the affinity for both agonists, but differentially modulates agonists efficacy in G-protein and β-arrestin pathways. Structural and spectroscopic analysis suggest that LY211620 stabilizes distinct intracellular conformational ensembles from agonist-bound M2R, which may enhance β-arrestin recruitment while impairing G-protein activation. These results highlight the role of conformational dynamics in the complex signaling behavior of GPCRs, and could facilitate design of better drugs.


  • Organizational Affiliation

    Innovation Academy for Precision Measurement Science and Technology, CAS, 430071, Wuhan, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Muscarinic acetylcholine receptor M2353Homo sapiensMutation(s): 0 
Gene Names: CHRM2
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P08172 (Homo sapiens)
Explore P08172 
Go to UniProtKB:  P08172
GTEx:  ENSG00000181072 
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UniProt GroupP08172
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(o) subunit alpha354Homo sapiensMutation(s): 0 
Gene Names: GNAO1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P09471 (Homo sapiens)
Explore P09471 
Go to UniProtKB:  P09471
GTEx:  ENSG00000087258 
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UniProt GroupP09471
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1345Homo sapiensMutation(s): 0 
Gene Names: GNB1
UniProt & NIH Common Fund Data Resources
Find proteins for P62873 (Homo sapiens)
Explore P62873 
Go to UniProtKB:  P62873
GTEx:  ENSG00000078369 
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UniProt GroupP62873
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  • Reference Sequence
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Entity ID: 4
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 
UniProt & NIH Common Fund Data Resources
Find proteins for P59768 (Homo sapiens)
Explore P59768 
Go to UniProtKB:  P59768
GTEx:  ENSG00000186469 
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UniProt GroupP59768
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  • Reference Sequence
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
scFV16256Mus musculusMutation(s): 0 
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
2CU (Subject of Investigation/LOI)
Query on 2CU

Download Ideal Coordinates CCD File 
G [auth A]3-amino-5-chloro-N-cyclopropyl-4-methyl-6-[2-(4-methylpiperazin-1-yl)-2-oxoethoxy]thieno[2,3-b]pyridine-2-carboxamide
C19 H24 Cl N5 O3 S
TYTGOXSAAQWLPJ-UHFFFAOYSA-N
ACH (Subject of Investigation/LOI)
Query on ACH

Download Ideal Coordinates CCD File 
F [auth A]ACETYLCHOLINE
C7 H16 N O2
OIPILFWXSMYKGL-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.22 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-25
    Type: Initial release
  • Version 1.1: 2024-02-07
    Changes: Data collection, Database references