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- PDB-12iy: Locally refined cryo-EM structure of human cannabinoid receptor 2... -

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Basic information

Entry
Database: PDB / ID: 12iy
TitleLocally refined cryo-EM structure of human cannabinoid receptor 2 with agonist '5249
ComponentsCannabinoid receptor 2
KeywordsMEMBRANE PROTEIN / Human cannabinoid receptor 2 / CNR2 / CB2 receptor / Gi1 / Agonist-bound state / AM12435-bound complex / Active-state GPCR / Class A rhodopsin-like receptor / Cryo-electron microscopy structure
Function / homology
Function and homology information


trans-synaptic signaling by endocannabinoid, modulating synaptic transmission / negative regulation of mast cell activation / negative regulation of synaptic transmission, GABAergic / cannabinoid receptor activity / negative regulation of action potential / Class A/1 (Rhodopsin-like receptors) / extrinsic component of cytoplasmic side of plasma membrane / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / response to amphetamine / adenylate cyclase-activating G protein-coupled receptor signaling pathway ...trans-synaptic signaling by endocannabinoid, modulating synaptic transmission / negative regulation of mast cell activation / negative regulation of synaptic transmission, GABAergic / cannabinoid receptor activity / negative regulation of action potential / Class A/1 (Rhodopsin-like receptors) / extrinsic component of cytoplasmic side of plasma membrane / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / response to amphetamine / adenylate cyclase-activating G protein-coupled receptor signaling pathway / response to lipopolysaccharide / G alpha (i) signalling events / response to ethanol / perikaryon / postsynaptic membrane / immune response / inflammatory response / dendrite / endoplasmic reticulum / plasma membrane / cytoplasm
Similarity search - Function
Cannabinoid receptor type 2 / Cannabinoid receptor family / Serpentine type 7TM GPCR chemoreceptor Srsx / G-protein coupled receptors family 1 signature. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile.
Similarity search - Domain/homology
: / Cannabinoid receptor 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.94 Å
AuthorsSacco, M. / Wu, C. / Singal, B. / Skiniotis, G.
Funding support United States, 1items
OrganizationGrant numberCountry
Defense Advanced Research Projects Agency (DARPA) United States
CitationJournal: J Med Chem / Year: 2026
Title: Library Docking for Cannabinoid-2 Receptor Ligands.
Authors: Moira M Rachman / Christos Iliopoulos-Tsoutsouvas / Michael D Sacco / Xinyu Xu / Cheng-Guo Wu / Emma Santos / Isabella S Glenn / Lu Paris / Michelle K Cahill / Suthakar Ganapathy / Tia A ...Authors: Moira M Rachman / Christos Iliopoulos-Tsoutsouvas / Michael D Sacco / Xinyu Xu / Cheng-Guo Wu / Emma Santos / Isabella S Glenn / Lu Paris / Michelle K Cahill / Suthakar Ganapathy / Tia A Tummino / Yurii S Moroz / Dmytro S Radchenko / Meri Okorie / Vivianne L Tawfik / John J Irwin / Alexandros Makriyannis / Georgios Skiniotis / Brian K Shoichet /
Abstract: Cannabinoid receptors are both therapeutically attractive and are interesting model systems for structure-based methods. Here we investigated topical questions in library docking using the CB2 ...Cannabinoid receptors are both therapeutically attractive and are interesting model systems for structure-based methods. Here we investigated topical questions in library docking using the CB2 receptor. While a CB1R docking campaign found potent but nonselective ligands, here subtype selective ligands were found by targeting polar residues. Hit rates and hit affinities improved with library size, but docking against active and inactive receptor states did not reliably bias toward agonists or antagonists. Cryo-EM structures of two of the new agonists superposed well on the docking predictions. Structure-based optimization led to 10- to 140-fold improvements within three series, consistent with well-behaved ligands. Hit rates with an explicit 2.6 billion molecule library resembled those of an implied 11 billion molecule library from a building-block method, supporting the latter's ability to explore this space, though higher affinities were discovered from the explicit set. Implications for future studies are considered.
History
DepositionApr 7, 2026Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 15, 2026Provider: repository / Type: Initial release
Revision 1.0Jul 15, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jul 15, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jul 15, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 15, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jul 15, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jul 15, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
R: Cannabinoid receptor 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)41,8342
Polymers41,4421
Non-polymers3911
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Cannabinoid receptor 2 / CB-2 / CB2 / hCB2 / CX5


Mass: 41442.398 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CNR2, CB2A, CB2B / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P34972
#2: Chemical ChemComp-A1DB5 / (3R)-3-{2-oxo-2-[7-(trifluoromethyl)-3,4-dihydro-1,5-benzoxazepin-5(2H)-yl]ethyl}-2-benzofuran-1(3H)-one


Mass: 391.341 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C20H16F3NO4 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Human cannabinoid receptor 2 with agonist '5249 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenConc.: 5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 400 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
4cryoSPARCCTF correction
9PHENIX1.21.2_5419model refinement
13cryoSPARC3D reconstruction
CTF correctionDetails: CTF parameters estimated using Patch CTF in cryoSPARC. Phase and amplitude corrections applied during reconstruction and refinement.
Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 8390158
Details: After patch motion correction and patch CTF estimation
3D reconstructionResolution: 2.94 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 505644 / Symmetry type: POINT
RefinementHighest resolution: 2.94 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0042221
ELECTRON MICROSCOPYf_angle_d0.593028
ELECTRON MICROSCOPYf_dihedral_angle_d6.085306
ELECTRON MICROSCOPYf_chiral_restr0.039365
ELECTRON MICROSCOPYf_plane_restr0.004358

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