{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,23]],"date-time":"2026-06-23T03:08:56Z","timestamp":1782184136461,"version":"3.54.5"},"reference-count":81,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2020,3,10]],"date-time":"2020-03-10T00:00:00Z","timestamp":1583798400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["DFG KL1415\/7-1"],"award-info":[{"award-number":["DFG KL1415\/7-1"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["program-project grant 394046635 \u2013 CRC 1365"],"award-info":[{"award-number":["program-project grant 394046635 \u2013 CRC 1365"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002347","name":"Bundesministerium f\u00fcr Bildung und Forschung","doi-asserted-by":"publisher","award":["16GW0179K"],"award-info":[{"award-number":["16GW0179K"]}],"id":[{"id":"10.13039\/501100002347","id-type":"DOI","asserted-by":"publisher"}]},{"name":"German Israeli Foundation","award":["I-1452-203\/13-2018"],"award-info":[{"award-number":["I-1452-203\/13-2018"]}]},{"name":"German Centre for Cardiovascular Research (DZHK) partner site Berlin","award":["81X2100146"],"award-info":[{"award-number":["81X2100146"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>Arginine-vasopressin (AVP) facilitates water reabsorption in renal collecting duct principal cells through regulation of the water channel aquaporin-2 (AQP2). The hormone binds to vasopressin V2 receptors (V2R) on the surface of the cells and stimulates cAMP synthesis. The cAMP activates protein kinase A (PKA), which initiates signaling that causes an accumulation of AQP2 in the plasma membrane of the cells facilitating water reabsorption from primary urine and fine-tuning of body water homeostasis. AVP-mediated PKA activation also causes an increase in the AQP2 protein abundance through a mechanism that involves dephosphorylation of AQP2 at serine 261 and a decrease in its poly-ubiquitination. However, the signaling downstream of PKA that controls the localization and abundance of AQP2 is incompletely understood. We carried out an siRNA screen targeting 719 kinase-related genes, representing the majority of the kinases of the human genome and analyzed the effect of the knockdown on AQP2 by high-content imaging and biochemical approaches. The screening identified 13 hits whose knockdown inhibited the AQP2 accumulation in the plasma membrane. Amongst the candidates was the so far hardly characterized cyclin-dependent kinase 18 (CDK18). Our further analysis revealed a hitherto unrecognized signalosome comprising CDK18, an E3 ubiquitin ligase, STUB1 (CHIP), PKA and AQP2 that controls the localization and abundance of AQP2. CDK18 controls AQP2 through phosphorylation at serine 261 and STUB1-mediated ubiquitination. STUB1 functions as an A-kinase anchoring protein (AKAP) tethering PKA to the protein complex and bridging AQP2 and CDK18. The modulation of the protein complex may lead to novel concepts for the treatment of disorders which are caused or are associated with dysregulated AQP2 and for which a satisfactory treatment is not available, e.g., hyponatremia, liver cirrhosis, diabetes insipidus, ADPKD or heart failure.<\/jats:p>","DOI":"10.3390\/cells9030673","type":"journal-article","created":{"date-parts":[[2020,3,12]],"date-time":"2020-03-12T12:22:51Z","timestamp":1584015771000},"page":"673","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Cyclin-Dependent Kinase 18 Controls Trafficking of Aquaporin-2 and Its Abundance through Ubiquitin Ligase STUB1, Which Functions as an AKAP"],"prefix":"10.3390","volume":"9","author":[{"given":"Alessandro","family":"Dema","sequence":"first","affiliation":[{"name":"Max Delbr\u00fcck Center for Molecular Medicine in the Helmholtz Association (MDC), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D\u00f6rte","family":"Faust","sequence":"additional","affiliation":[{"name":"Max Delbr\u00fcck Center for Molecular Medicine in the Helmholtz Association (MDC), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katina","family":"Lazarow","sequence":"additional","affiliation":[{"name":"Leibniz-Forschungsinstitut f\u00fcr Molekulare Pharmakologie (FMP), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marc","family":"Wippich","sequence":"additional","affiliation":[{"name":"Leibniz-Forschungsinstitut f\u00fcr Molekulare Pharmakologie (FMP), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Neuenschwander","sequence":"additional","affiliation":[{"name":"Leibniz-Forschungsinstitut f\u00fcr Molekulare Pharmakologie (FMP), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kerstin","family":"Z\u00fchlke","sequence":"additional","affiliation":[{"name":"Max Delbr\u00fcck Center for Molecular Medicine in the Helmholtz Association (MDC), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Geelhaar","sequence":"additional","affiliation":[{"name":"Max Delbr\u00fcck Center for Molecular Medicine in the Helmholtz Association (MDC), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tamara","family":"Pallien","sequence":"additional","affiliation":[{"name":"Max Delbr\u00fcck Center for Molecular Medicine in the Helmholtz Association (MDC), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eileen","family":"Hallscheidt","sequence":"additional","affiliation":[{"name":"Max Delbr\u00fcck Center for Molecular Medicine in the Helmholtz Association (MDC), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jenny","family":"Eichhorst","sequence":"additional","affiliation":[{"name":"Leibniz-Forschungsinstitut f\u00fcr Molekulare Pharmakologie (FMP), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Burkhard","family":"Wiesner","sequence":"additional","affiliation":[{"name":"Leibniz-Forschungsinstitut f\u00fcr Molekulare Pharmakologie (FMP), Robert-R\u00f6ssle-Strasse 10, 13125 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hana","family":"\u010cerneck\u00e1","sequence":"additional","affiliation":[{"name":"Max Delbr\u00fcck Center for 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