title: Arrestin domain-containing protein 3 recruits the NEDD4 E3 ligase to mediate ubiquitination of the beta2-adrenergic receptor.
abstract: Prolonged stimulation of the beta2-adrenergic receptor (beta2AR) leads to receptor ubiquitination and downregulation. Using a genome-wide RNA interference screen, we identified arrestin domain-containing 3 (ARRDC3) as a gene required for beta2AR regulation. The ARRDC3 protein interacts with ubiquitin ligase neural precursor development downregulated protein 4 (NEDD4) through two conserved PPXY motifs and recruits NEDD4 to the activated receptor. The ARRDC3 protein also interacts and co-localizes with activated beta2AR. Knockdown of ARRDC3 expression abolishes the association between NEDD4 and beta2AR. Furthermore, functional inactivation of ARRDC3, either through small interfering RNA (siRNA)-mediated knockdown or overexpression of a mutant that does not interact with NEDD4, blocks receptor ubiquitination and degradation. Our results establish ARRDC3 as an essential adaptor for beta2AR ubiquitination.
authors.affiliation: Program in Molecular and Integrative Physiological Sciences, Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02115, USA.
authors.forename: Joseph F
authors.initials: JF
authors.lastname: Nabhan
authors.forename: Hui
authors.initials: H
authors.lastname: Pan
authors.forename: Quan
authors.initials: Q
authors.lastname: Lu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D019390:Arrestins / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D056827:Endosomal Sorting Complexes Required for Transport / Q000235:genetics / Q000378:metabolism*; D055785:Gene Knockdown Techniques; D006801:Humans; D008969:Molecular Sequence Data; D000075702:Nedd4 Ubiquitin Protein Ligases; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D018343:Receptors, Adrenergic, beta-2 / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D044767:Ubiquitin-Protein Ligases / Q000235:genetics / Q000378:metabolism*; D054875:Ubiquitination
chemical_list: C508469:ARRDC3 protein, human; D019390:Arrestins; D056827:Endosomal Sorting Complexes Required for Transport; D034741:RNA, Small Interfering; D018343:Receptors, Adrenergic, beta-2; D011993:Recombinant Fusion Proteins; D000075702:Nedd4 Ubiquitin Protein Ligases; C000618483:Nedd4 protein, human; D044767:Ubiquitin-Protein Ligases