Download MendeleyStructural insights into small-molecule agonist recognition and activation of complement receptor C3aR.
Kim, J., Ko, S., Choi, C., Bae, J., Byeon, H., Seok, C., Choi, H.J.(2025) EMBO J 44: 2803-2826
- PubMed: 40195498
- DOI: https://doi.org/10.1038/s44318-025-00429-w
- Primary Citation of Related Structures:
9IPV, 9IPY, 9ISI - PubMed Abstract:
The complement system plays crucial roles in innate immunity and inflammatory responses. The anaphylatoxin C3a mediates pro-inflammatory and chemotactic functions through the G protein-coupled receptor C3aR. While the active structure of the C3a-C3aR-G i complex has been determined, the inactive conformation and activation mechanism of C3aR remain elusive. Here we report the cryo-EM structure of ligand-free, G protein-free C3aR, providing insights into its inactive conformation. In addition, we determine the structures of C3aR in complex with the synthetic small-molecule agonist JR14a in two distinct conformational states: a G protein-free intermediate, and a fully active G i -bound state. The structure of the active JR14a-bound C3aR reveals that JR14a engages in highly conserved interactions with C3aR, similar to the binding of the C-terminal pentapeptide of C3a, along with JR14a-specific interactions. Structural comparison of C3aR in the apo, intermediate, and fully active states provides novel insights into the conformational landscape and activation mechanism of C3aR and defines a molecular basis explaining its high basal activity. Our results may aid in the rational design of therapeutics targeting complement-related inflammatory disorders.
Organizational Affiliation:
Department of Biological Sciences, Seoul National University, Seoul, 08826, Republic of Korea.
