Mechanosensitive cation channel TMEM63B

UniProtKB accession:  Q3TWI9

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UniProtKB description:  Mechanosensitive cation channel with low conductance and high activation threshold (PubMed:27045885, PubMed:30382938, PubMed:31243992, PubMed:37543036, PubMed:37945568, PubMed:38127458). Osmosensitive cation channel preferentially activated by hypotonic stress (PubMed:27045885). Also acts as a phospholipid scramblase in response to changes in membrane structure: upon changes in membrane curvature and thickness, alters its conformation and translocates phospholipids, such as phosphatidylcholine and sphingomyelin, thereby controlling plasma membrane lipid distribution (PubMed:39217145, PubMed:39424995). Forms a heterodimer with SLC19A2, which mediates phospholipid scramblase activity following Ca(2+) stimulation (PubMed:39217145). Expressed in excitatory neurons of the subfornical organ and functions as a thirst receptor that mediates neuronal response to hyperosmolality to drive thirst and drinking behavior (PubMed:38172113). Facilitates intestinal motility by promoting proliferation of intestinal stem cells (PubMed:39513891). Essential for the baby's first breath and respiration throughout life (PubMed:38127458). Upon lung inflation conducts cation currents in alveolar type 1 and 2 cells triggering lamellar body exocytosis and surfactant secretion into airspace (PubMed:38127458). Acts as an osmosensor in cochlear outer hair cells (OHCs) where it mediates calcium influx and regulatory volume decrease response (PubMed:32375046). Required for the maintenance of OHC morphology, OHC survival and normal hearing (PubMed:32375046).