Structural component of the gap junctions and the hemichannels involved in the ATP release and nucleotide permeation (PubMed:16908669, PubMed:20829356, PubMed:30918116). May play a role as a Ca(2+)-leak channel to regulate ER Ca(2+) homeostasis (PubMed:16908669). Plays a critical role in oogenesis (PubMed:30918116). Homohexamer. Forms homomeric or PANX1/PANX2-heteromeric intercellular channels on coexpression in paired Xenopus oocytes (By similarity). Widely expressed (PubMed:30918116). Highest expression is observed in oocytes and brain (PubMed:30918116). Detected at very low levels in sperm cells (PubMed:30918116). S-nitrosylation inhibits channel currents and ATP release. N-glycosylation may play a role in cell surface targeting (By similarity). Exists in three glycosylation states: non-glycosylated (GLY0), high-mannose glycosylated (GLY1), and fully mature glycosylated (GLY2) (PubMed:30918116). The disease is caused by variants affecting the gene represented in this entry. Belongs to the pannexin family. Pannexin entry