- Hughes, Taylor ET;
- Lodowski, David T;
- Huynh, Kevin W;
- Yazici, Aysenur;
- Del Rosario, John;
- Kapoor, Abhijeet;
- Basak, Sandip;
- Samanta, Amrita;
- Han, Xu;
- Chakrapani, Sudha;
- Zhou, Z Hong;
- Filizola, Marta;
- Rohacs, Tibor;
- Han, Seungil;
- Moiseenkova-Bell, Vera Y
The transient receptor potential vanilloid 5 (TRPV5) channel is a member of the transient receptor potential (TRP) channel family, which is highly selective for Ca2+, that is present primarily at the apical membrane of distal tubule epithelial cells in the kidney and plays a key role in Ca2+ reabsorption. Here we present the structure of the full-length rabbit TRPV5 channel as determined using cryo-EM in complex with its inhibitor econazole. This structure reveals that econazole resides in a hydrophobic pocket analogous to that occupied by phosphatidylinositides and vanilloids in TRPV1, thus suggesting conserved mechanisms for ligand recognition and lipid binding among TRPV channels. The econazole-bound TRPV5 structure adopts a closed conformation with a distinct lower gate that occludes Ca2+ permeation through the channel. Structural comparisons between TRPV5 and other TRPV channels, complemented with molecular dynamics (MD) simulations of the econazole-bound TRPV5 structure, allowed us to gain mechanistic insight into TRPV5 channel inhibition by small molecules.