title: Src-mediated tyrosine phosphorylation of dynamin is required for beta2-adrenergic receptor internalization and mitogen-activated protein kinase signaling.
abstract: Some forms of G protein-coupled receptor signaling, such as activation of mitogen-activated protein kinase cascade as well as resensitization of receptors after hormone-induced desensitization, require receptor internalization via dynamin-dependent clathrin-coated pit mechanisms. Here we demonstrate that activation of beta2-adrenergic receptors (beta2-ARs) leads to c-Src-mediated tyrosine phosphorylation of dynamin, which is required for receptor internalization. Two tyrosine residues, Tyr231 and Tyr597, are identified as the major phosphorylation sites. Mutation of these residues to phenylalanine dramatically decreases the c-Src-mediated phosphorylation of dynamin following beta2-AR stimulation. Moreover, expression of Y231F/Y597F dynamin inhibits beta2-AR internalization and the isoproterenol-stimulated mitogen-activated protein kinase activation. Thus, agonist-induced, c-Src-mediated tyrosine phosphorylation of dynamin is essential for its function in clathrin mediated G protein-coupled receptor endocytosis.
authors.affiliation: Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710, USA.
authors.forename: S
authors.initials: S
authors.lastname: Ahn
authors.forename: S
authors.initials: S
authors.lastname: Maudsley
authors.forename: L M
authors.initials: LM
authors.lastname: Luttrell
authors.forename: R J
authors.initials: RJ
authors.lastname: Lefkowitz
authors.forename: Y
authors.initials: Y
authors.lastname: Daaka
mesh_terms: D000081247:CSK Tyrosine-Protein Kinase; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D002460:Cell Line; D002851:Chromatography, High Pressure Liquid; D034281:Dynamins; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D020558:GTP Phosphohydrolases / Q000378:metabolism*; D006801:Humans; D008870:Microtubules / Q000201:enzymology*; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D018343:Receptors, Adrenergic, beta-2 / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects; D014443:Tyrosine / Q000378:metabolism*; D018909:src Homology Domains; D019061:src-Family Kinases
chemical_list: D004791:Enzyme Inhibitors; D018343:Receptors, Adrenergic, beta-2; D014443:Tyrosine; D011505:Protein-Tyrosine Kinases; D000081247:CSK Tyrosine-Protein Kinase; D019061:src-Family Kinases; C000631346:CSK protein, human; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D020558:GTP Phosphohydrolases; D034281:Dynamins