title: GGA3 Interacts with a G Protein-Coupled Receptor and Modulates Its Cell Surface Export.
abstract: Molecular mechanisms governing the anterograde trafficking of nascent G protein-coupled receptors (GPCRs) are poorly understood. Here, we have studied the regulation of cell surface transport of α2-adrenergic receptors (α2-ARs) by GGA3 (Golgi-localized, γ-adaptin ear domain homology, ADP ribosylation factor-binding protein 3), a multidomain clathrin adaptor protein that sorts cargo proteins at the trans-Golgi network (TGN) to the endosome/lysosome pathway. By using an inducible system, we demonstrated that GGA3 knockdown significantly inhibited the cell surface expression of newly synthesized α2B-AR without altering overall receptor synthesis and internalization. The receptors were arrested in the TGN. Furthermore, GGA3 knockdown attenuated α2B-AR-mediated signaling, including extracellular signal-regulated kinase 1/2 (ERK1/2) activation and cyclic AMP (cAMP) inhibition. More interestingly, GGA3 physically interacted with α2B-AR, and the interaction sites were identified as the triple Arg motif in the third intracellular loop of the receptor and the acidic motif EDWE in the VHS domain of GGA3. In contrast, α2A-AR did not interact with GGA3 and its cell surface export and signaling were not affected by GGA3 knockdown. These data reveal a novel function of GGA3 in export trafficking of a GPCR that is mediated via a specific interaction with the receptor.
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
authors.forename: Maoxiang
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
authors.forename: Jason E
authors.initials: JE
authors.lastname: Davis
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
authors.forename: Chunman
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Gao
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
authors.forename: Nevin A
authors.initials: NA
authors.lastname: Lambert
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
authors.forename: Alvin V
authors.initials: AV
authors.lastname: Terry
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta University, Augusta, Georgia, USA guwu@gru.edu.
authors.forename: Guangyu
authors.initials: G
authors.lastname: Wu
mesh_terms: D033942:Adaptor Proteins, Vesicular Transport / Q000378:metabolism*; D000595:Amino Acid Sequence; D001665:Binding Sites; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D055785:Gene Knockdown Techniques; D006801:Humans; D008969:Molecular Sequence Data; D017434:Protein Structure, Tertiary; D021381:Protein Transport; D018341:Receptors, Adrenergic, alpha-2 / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D021601:trans-Golgi Network / Q000378:metabolism
chemical_list: C547771:ADRA2B protein, human; D033942:Adaptor Proteins, Vesicular Transport; C407306:GGA adaptor proteins; D018341:Receptors, Adrenergic, alpha-2; D011993:Recombinant Fusion Proteins
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