Enables several functions, including ATP binding activity; extracellularly ATP-gated cation channel activity; and metal ion binding activity. Involved in several processes, including ATP export; bleb assembly; and positive regulation of macromolecule metabolic process. Located in several cellular components, including bleb; membrane raft; and terminal bouton. Is integral component of nuclear inner membrane. Part of protein-containing complex. Orthologous to human P2RX7 (purinergic receptor P2X 7). [provided by Alliance of Genome Resources, Apr 2022]