Receptor for ATP that acts as a ligand-gated cation channel (PubMed:7566120, PubMed:7566119). Plays a role in sensory perception. Required for normal perception of pain. Required for normal taste perception (By similarity). Homotrimer (By similarity). Functional P2XRs are organized as homomeric and heteromeric trimers (PubMed:7566120). Selectively expressed in sensory ganglia. Belongs to the P2X receptor family.