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• W2056094273 abstract "Equilibrative Nucleoside Transporters (SLC29) are a family of proteins that transport nucleosides, nucleobases and nucleoside analogue drugs across cellular membranes. ENT1 is expressed ubiquitously in mammalian tissues and responsible for a significant portion of nucleoside analog drug uptake in humans. Despite the important clinical role of ENT1, many aspects of the regulation of this protein remain unknown. A major outstanding question in this field is the whether ENT1 is phosphorylated directly. To answer this question, we overexpressed tagged human (h) and mouse (m) ENT1, affinity purified protein using the tag, conducted phosphoamino acid analysis and found that m/hENT1 is predominantly phosphorylated at serine residues. The large intracellular loop of ENT1, between transmembrane domains 6 and 7, has been suggested to be a site of regulation by phosphorylation, therefore we generated His/Ubiquitin tagged peptides of this region and used them for in vitro kinase assays to identify target serines. Our data support a role for PKA and PKC in the phosphorylation of ENT1 within the intracellular loop and show that PKA can phosphorylate multiple sites within this loop while PKC specifically targets serines 279 and 286 and threonine 274. These data demonstrate, for the first time, that ENT1 is a phosphoprotein that can be directly phosphorylated at several sites by more than one kinase. The presence of multiple kinase targets within the loop suggests that ENT1 phosphorylation is considerably more complex than previously thought and thus ENT1 may be subject to phosphorylation by multiple pathways." @default.
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• W2056094273 date "2011-08-02" @default.
• W2056094273 modified "2023-10-13" @default.
• W2056094273 title "The Equilibrative Nucleoside Transporter (ENT1) can be phosphorylated at multiple sites by PKC and PKA" @default.
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• W2056094273 doi "https://doi.org/10.3109/09687688.2011.604861" @default.
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