RCSB PDB - 6NI2: Stabilized beta-arrestin 1-V2T subcomplex of a GPCR-G protein-beta-arrestin mega-complex (original) (raw)
Structure of an endosomal signaling GPCR-G protein-beta-arrestin megacomplex.
[Nguyen, A.H.](/search?q=citation.rcsb%5Fauthors:Nguyen, A.H.), [Thomsen, A.R.B.](/search?q=citation.rcsb%5Fauthors:Thomsen, A.R.B.), [Cahill 3rd, T.J.](/search?q=citation.rcsb%5Fauthors:Cahill 3rd, T.J.), [Huang, R.](/search?q=citation.rcsb%5Fauthors:Huang, R.), [Huang, L.Y.](/search?q=citation.rcsb%5Fauthors:Huang, L.Y.), [Marcink, T.](/search?q=citation.rcsb%5Fauthors:Marcink, T.), [Clarke, O.B.](/search?q=citation.rcsb%5Fauthors:Clarke, O.B.), [Heissel, S.](/search?q=citation.rcsb%5Fauthors:Heissel, S.), [Masoudi, A.](/search?q=citation.rcsb%5Fauthors:Masoudi, A.), [Ben-Hail, D.](/search?q=citation.rcsb%5Fauthors:Ben-Hail, D.), [Samaan, F.](/search?q=citation.rcsb%5Fauthors:Samaan, F.), [Dandey, V.P.](/search?q=citation.rcsb%5Fauthors:Dandey, V.P.), [Tan, Y.Z.](/search?q=citation.rcsb%5Fauthors:Tan, Y.Z.), [Hong, C.](/search?q=citation.rcsb%5Fauthors:Hong, C.), [Mahoney, J.P.](/search?q=citation.rcsb%5Fauthors:Mahoney, J.P.), [Triest, S.](/search?q=citation.rcsb%5Fauthors:Triest, S.), [Little 4th, J.](/search?q=citation.rcsb%5Fauthors:Little 4th, J.), [Chen, X.](/search?q=citation.rcsb%5Fauthors:Chen, X.), [Sunahara, R.](/search?q=citation.rcsb%5Fauthors:Sunahara, R.), [Steyaert, J.](/search?q=citation.rcsb%5Fauthors:Steyaert, J.), [Molina, H.](/search?q=citation.rcsb%5Fauthors:Molina, H.), [Yu, Z.](/search?q=citation.rcsb%5Fauthors:Yu, Z.), [des Georges, A.](/search?q=citation.rcsb%5Fauthors:des Georges, A.), [Lefkowitz, R.J.](/search?q=citation.rcsb%5Fauthors:Lefkowitz, R.J.)
(2019) Nat Struct Mol Biol 26: 1123-1131
PubMed Abstract:
Classically, G-protein-coupled receptors (GPCRs) are thought to activate G protein from the plasma membrane and are subsequently desensitized by β-arrestin (β-arr). However, some GPCRs continue to signal through G protein from internalized compartments, mediated by a GPCR-G protein-β-arr 'megaplex'. Nevertheless, the molecular architecture of the megaplex remains unknown. Here, we present its cryo-electron microscopy structure, which shows simultaneous engagement of human G protein and bovine β-arr to the core and phosphorylated tail, respectively, of a single active human chimeric β 2 -adrenergic receptor with the C-terminal tail of the arginine vasopressin type 2 receptor (β 2 V 2 R). All three components adopt their canonical active conformations, suggesting that a single megaplex GPCR is capable of simultaneously activating G protein and β-arr. Our findings provide a structural basis for GPCR-mediated sustained internalized G protein signaling.
Organizational Affiliation:
Department of Medicine, Duke University Medical Center, Durham, NC, USA.