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Publication Detail
Clathrin-mediated endocytosis of the beta-adrenergic receptor is regulated by phosphorylation/dephosphorylation of beta-arrestin1.
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Lin FT, Krueger KM, Kendall HE, Daaka Y, Fredericks ZL, Pitcher JA, Lefkowitz RJ
  • Publication date:
  • Pagination:
    31051, 31057
  • Journal:
    J Biol Chem
  • Volume:
  • Issue:
  • Country:
  • Print ISSN:
  • Language:
  • Keywords:
    Amino Acid Substitution, Arrestins, Cell Line, Endocytosis, Humans, Mutagenesis, Phosphorylation, Protein Binding, Receptors, Adrenergic, beta-2, Serine
beta-Arrestins serve a dual regulatory role in the life cycle of G protein-coupled receptors such as the beta2-adrenergic receptor. First, they mediate rapid desensitization by binding to G protein-coupled receptor kinase-phosphorylated receptors. Second, they target the receptors for internalization into endosomal vesicles, wherein receptor dephosphorylation and resensitization occur. Here we report that phosphorylation of a carboxyl-terminal serine (Ser-412) in beta-arrestin1 regulates its endocytotic but not its desensitization function. Cytoplasmic beta-arrestin1 is constitutively phosphorylated and is recruited to the plasma membrane by agonist stimulation of the receptors. At the plasma membrane, beta-arrestin1 is rapidly dephosphorylated, a process that is required for its clathrin binding and receptor endocytosis but not for its receptor binding and desensitization. Once internalized, beta-arrestin1 is rephosphorylated. Thus, as with the classical endocytic adaptor protein complex AP2, beta-arrestin1 functions as a clathrin adaptor in receptor endocytosis which is regulated by dephosphorylation at the plasma membrane.
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