Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 5-mer - A1B1C1D1E1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 153.6 kDa 
• Atom Count: 8,775 
• Modelled Residue Count: 1,135 
• Deposited Residue Count: 1,384 
• Unique protein chains: 5

 6KPF

Cryo-EM structure of a class A GPCR with G protein complex

• PDB DOI:  https://doi.org/10.2210/pdb6KPF/pdb
• EM Map EMD-0744: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2019-08-15 Released: 2020-02-12 
• Deposition Author(s): Li, X.T., Hua, T., Wu, L.J., Makriyannis, A., Shen, L., Wang, Y.X., Liu, Z.J.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.90 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Activation and Signaling Mechanism Revealed by Cannabinoid Receptor-GiComplex Structures.

Hua, T., Li, X., Wu, L., Iliopoulos-Tsoutsouvas, C., Wang, Y., Wu, M., Shen, L., Johnston, C.A., Nikas, S.P., Song, F., Song, X., Yuan, S., Sun, Q., Wu, Y., Jiang, S., Grim, T.W., Benchama, O., Stahl, E.L., Zvonok, N., Zhao, S., Bohn, L.M., Makriyannis, A., Liu, Z.J.

(2020) Cell 180: 655

• PubMed: 32004463 
• DOI: https://doi.org/10.1016/j.cell.2020.01.008
• Primary Citation of Related Structures:  
  6KPC, 6KPF, 6KPG


• PubMed Abstract: 
  

Human endocannabinoid systems modulate multiple physiological processes mainly through the activation of cannabinoid receptors CB1 and CB2. Their high sequence similarity, low agonist selectivity, and lack of activation and G protein-coupling knowledge have hindered the development of therapeutic applications. Importantly, missing structural information has significantly held back the development of promising CB2-selective agonist drugs for treating inflammatory and neuropathic pain without the psychoactivity of CB1. Here, we report the cryoelectron microscopy structures of synthetic cannabinoid-bound CB2 and CB1 in complex with G _i , as well as agonist-bound CB2 crystal structure. Of important scientific and therapeutic benefit, our results reveal a diverse activation and signaling mechanism, the structural basis of CB2-selective agonists design, and the unexpected interaction of cholesterol with CB1, suggestive of its endogenous allosteric modulating role.

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Organizational Affiliation: 

iHuman Institute, ShanghaiTech University, Shanghai 201210, China; School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; Institute of Molecular and Clinical Medicine, Kunming Medical University, Kunming 650500, Yunnan Province, China. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(i) subunit alpha-1	A	354	Homo sapiens	Mutation(s): 0  Gene Names: GNAI1 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P63096 (Homo sapiens) Explore P63096  Go to UniProtKB:  P63096
PHAROS:  P63096

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	340	Homo sapiens	Mutation(s): 0  Gene Names: GNB1
UniProt & NIH Common Fund Data Resources
Find proteins for P62873 (Homo sapiens) Explore P62873  Go to UniProtKB:  P62873
PHAROS:  P62873

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	C	71	Homo sapiens	Mutation(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
PHAROS:  P59768

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Cannabinoid receptor 2	D [auth R]	360	Homo sapiens	Mutation(s): 0  Gene Names: CNR2, CB2A, CB2B Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P34972 (Homo sapiens) Explore P34972  Go to UniProtKB:  P34972
PHAROS:  P34972

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
scFv16	E [auth S]	259	Homo sapiens	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
E3R (Subject of Investigation/LOI)	F [auth R]	7-[(6aR,9R,10aR)-1-Hydroxy-9-(hydroxymethyl)-6,6-dimethyl-6a,7,8,9,10,10a-hexahydro-6H-benzo[c]chromen-3-yl]- 7-methyloctanenitrile C25 H37 N O3 FTYAKKNPQHUECV-MISYRCLQSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.90 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	RELION	3.03
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History 

Deposition Data

• Released Date: 2020-02-12 
Deposition Author(s): Li, X.T., Hua, T., Wu, L.J., Makriyannis, A., Shen, L., Wang, Y.X., Liu, Z.J.

Revision History  

• Version 1.0: 2020-02-12
  Type: Initial release
  
• Version 1.1: 2020-03-11
  Changes: Database references
• Version 2.0: 2022-04-27
  Changes: Advisory, Atomic model, Author supporting evidence, Data collection, Database references, Derived calculations, Non-polymer description, Source and taxonomy, Structure summary