7TUZ

Cryo-EM structure of 7alpha,25-dihydroxycholesterol-bound EBI2/GPR183 in complex with Gi protein

Summary for 7TUZ

• Entry DOI: 10.2210/pdb7tuz/pdb
• EMDB information: 26136
• Descriptor: G-protein coupled receptor 183, Guanine nucleotide-binding protein G(i) subunit alpha-1, Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1, ... (6 entities in total)
• Functional Keywords: ebi2, gpr183, oxysterol, gpcr, signaling, immunity, immunocyte migration, immune system
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 5
• Total formula weight: 160296.95

Authors

Chen, H.,Hung, W.,Li, X. (deposition date: 2022-02-03, release date: 2022-04-13, Last modification date: 2024-10-30)

Primary citation

Chen, H.,Huang, W.,Li, X.
Structures of oxysterol sensor EBI2/GPR183, a key regulator of the immune response.
Structure, 30:1016-, 2022

PubMed Abstract: Oxysterols induce the migration of B-lymphocytes and dendritic cells to interfollicular regions of lymphoid tissues through binding the EBI2 (GPR183) to stimulate effective adaptive immunity and antibody production during infection. Aberrant EBI2 signaling is implicated in inflammatory bowel disease, sclerosis, and infectious disease. Here, we report the cryo-EM structures of an EBI2-G signaling complex with its endogenous agonist 7α,25-OHC and that of an inactive EBI2 bound to the inverse agonist GSK682753A. These structures reveal an agonist binding site for the oxysterol and a potential ligand entrance site exposed to the lipid bilayer. Mutations within the oxysterol binding site and the Gα interface attenuate G protein signaling and abolish oxysterol-mediated cell migration indicating that G protein signaling directly involves in the oxysterol-EBI2 pathway. Together, these findings provide new insight into how EBI2 is activated by an oxysterol ligand and will facilitate the development of therapeutic approaches that target EBI2-linked diseases.

PubMed: 35537452
DOI: 10.1016/j.str.2022.04.006

Experimental method

ELECTRON MICROSCOPY (3.12 Å)