7UL3 image
Deposition Date 2022-04-03
Release Date 2022-06-29
Last Version Date 2024-10-09
Entry Detail
PDB ID:
7UL3
Title:
CryoEM Structure of Inactive H2R Bound to Famotidine, Nb6M, and NabFab
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Histamine H2 receptor
Gene (Uniprot):HRH2
Chain IDs:A
Chain Length:400
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Nanobody 6M
Chain IDs:B (auth: C)
Chain Length:131
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polypeptide(L)
Molecule:NabFab HC
Chain IDs:C (auth: H)
Chain Length:239
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polypeptide(L)
Molecule:NabFab LC
Chain IDs:D (auth: L)
Chain Length:215
Number of Molecules:1
Biological Source:synthetic construct
Ligand Molecules
Primary Citation
Structure determination of inactive-state GPCRs with a universal nanobody.
Nat.Struct.Mol.Biol. 29 1188 1195 (2022)
PMID: 36396979 DOI: 10.1038/s41594-022-00859-8

Abstact

Cryogenic electron microscopy (cryo-EM) has widened the field of structure-based drug discovery by allowing for routine determination of membrane protein structures previously intractable. Despite representing one of the largest classes of therapeutic targets, most inactive-state G protein-coupled receptors (GPCRs) have remained inaccessible for cryo-EM because their small size and membrane-embedded nature impedes projection alignment for high-resolution map reconstructions. Here we demonstrate that the same single-chain camelid antibody (nanobody) recognizing a grafted intracellular loop can be used to obtain cryo-EM structures of inactive-state GPCRs at resolutions comparable or better than those obtained by X-ray crystallography. Using this approach, we obtained structures of neurotensin 1 receptor bound to antagonist SR48692, μ-opioid receptor bound to alvimopan, apo somatostatin receptor 2 and histamine receptor 2 bound to famotidine. We expect this rapid, straightforward approach to facilitate the broad exploration of GPCR inactive states without the need for extensive engineering and crystallization.

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