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Beschreibung

Anoctamin-6 (UniProt: Q6P9J9, also known as Small-conductance calcium-activated nonselective cation channel, SCAN channel, Transmembrane protein 16F) is encoded by the Ano6 (also known as Tmem16f) gene (Gene ID: 105722) in murine species. ANO6/TMEM16F is a multi-pass membrane glycoprotein with six cytoplasmic domains, ten transmembrane domains, and four extracellular domains. It is predominant expressed in epithelial tissues and is also found in skeletal system where it is primarily expressed in osteoblasts. It serves as a small-conductance calcium-activated nonselective cation (SCAN) channel that acts as a regulator of phospholipid scrambling in platelets, osteoblasts and fetal thymocytes. Phospholipid scrambling results in surface exposure of phosphatidylserine which in platelets is essential to trigger the clotting system. In osteoblasts it is essential for the deposition of hydroxyapatite during bone mineralization. ANO6/TMEM16F displays calcium-dependent phospholipid scramblase activity whereby it scrambles phosphatidylserine, phosphatidylcholine, and galactosylceramide. It is shown to be a key component of the plasma membrane repair mechanism triggered by pore-forming agents, such as bacterial toxins. This is achieved by activation of ANO6/TMEM16F by an increase in intracellular calcium resulting from flux of extracellular calcium ion. ANO6/TMEM16F is also shown to generate outwardly rectifying chloride channel currents in airway epithelial cells and Jurkat cells . (Ref.: Wu, N., et al. (2020). Cell Rep. 30(4), 1129-1140).