Gating the pore of the calcium-activated chloride channel TMEM16A

Abstract

The binding of cytoplasmic Ca2+ to the anion-selective channel TMEM16A triggers a conformational change around its binding site that is coupled to the release of a gate at the constricted neck. Here authors use cryo-EM and electrophysiology to identify three hydrophobic residues at the intracellular entrance of the neck as constituents of this gate.