Aquaporin 2 (AQP2) is a hormonally regulated water channel located in the renal collecting duct. Mutations in the AQP2 gene cause hereditary nephrogenic diabetes insipidus in humans. A vasopressin induced cAMP increase results in the phosphorylation of AQP2 at serine-256 and its translocation from the intracellular vesicles to the apical membrane of principal cells. Recently, serine-261 has been identified as a novel phosphorylation site on AQP2 and levels of phosphorylated S261 have been shown to decrease with vasopressin treatment suggesting its involvement in vasopressin-dependent AQP2 trafficking.
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Protein Aliases: ADH water channel; AQP-2; AQP-CD; aquaporin 2 (collecting duct); Aquaporin-2; Aquaporin-CD; Collecting duct water channel protein; Water channel protein for renal collecting duct; water-channel aquaporin 2; WCH-CD
Gene Aliases: AQP-CD; AQP2; WCH-CD
UniProt ID: (Human) P41181
Entrez Gene ID: (Human) 359
Molecular Function: transporter