Structures of oxysterol sensor EBI2/GPR183, a key regulator of the immune response.

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_i 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_i interface attenuate G protein signaling and abolish oxysterol-mediated ce

SUBMITTER: Chen H 

PROVIDER: S-EPMC9271633 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature