{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Adaptor‐associated kinase 1 (AAK1) is a serine/threonine kinase that plays a central role in regulating clathrin‐mediated endocytosis by phosphorylating the μ2 subunit of the AP2 adaptor complex. This phosphorylation event promotes the recruitment of cargo proteins and the maturation of clathrin‐coated pits, thereby influencing receptor internalization and vesicle formation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Through these actions, AAK1 is critical for several cellular processes. For example, during infection, AAK1 modulates the binding of AP2 to viral proteins to regulate both the assembly and entry of hepatitis C virus—and similarly, it governs the entry of other viruses such as rabies and dengue by orchestrating the endocytic trafficking of viral particles."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In addition, AAK1 influences key signaling pathways; it participates in Notch receptor processing by stabilizing the membrane‐tethered active form prior to its cleavage and limits WNT signaling by promoting the clearance of the LRP6 co‐receptor."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In neuronal contexts, AAK1 functions downstream of NDR kinases to help regulate dendrite growth and synapse development, with altered AAK1 expression linked to aspects of neurodegeneration."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " Moreover, modulation of AAK1 activity has been implicated in controlling the endocytosis of proteins such as the Na⁺,K⁺-ATPase and in affecting cellular sensitivity to chemotherapeutic or antiviral agents."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Collectively, these findings establish AAK1 as a multifaceted regulator of endocytic trafficking—a “master regulator” that integrates signals to control receptor dynamics, cellular signaling cascades, and viral pathogenesis, thereby identifying it as a promising target for therapeutic intervention in a variety of disease contexts.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Gregory Neveu, Rina Barouch-Bentov, Amotz Ziv-Av, et al. 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