Abstract
The Ca(2+)-activated TRPM5 channel plays essential roles in taste perception and insulin secretion. However, the mechanism by which Ca(2+) regulates TRPM5 activity remains elusive. We report cryo-EM structures of the zebrafish TRPM5 in an apo closed state, a Ca(2+)-bound open state, and an antagonist-bound inhibited state. We define two novel ligand binding sites: a Ca(2+) site (Ca(ICD)) in the intracellular domain and an antagonist site in the transmembrane domain (TMD). The Ca(ICD) site is unique to TRPM5 and has two roles: modulating the voltage dependence and promoting Ca(2+) binding to the Ca(TMD) site, which is conserved throughout TRPM channels. Conformational changes initialized from both Ca(2+) sites cooperatively open the ion-conducting pore. The antagonist NDNA wedges into the space between the S1-S4 domain and pore domain, stabilizing the transmembrane domain in an apo-like closed state. Our results lay the foundation for understanding the voltage-dependent TRPM channels and developing new therapeutic agents.