Cited by 81Cellular transport and secretionReceptor Mechanisms and Signaling14-3-3 protein interactions

Assembly-dependent Surface Targeting of the Heterodimeric GABAB Receptor Is Controlled by COPI but Not 14-3-3

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Brock, Carsten, Boudier, Laure, Maurel, Damien, Blahos, Jaroslav, Pin, Jean-Philippe·2005·Molecular Biology of the Cell

Abstract

Cell surface expression of transmembrane proteins is strictly regulated. Mutually exclusive interaction with COPI or 14-3-3 proteins has been proposed as a mechanism underlying such trafficking control of various proteins. In particular, 14-3-3 dimers have been proposed to "sense" correctly assembled oligomers, allowing their surface targeting by preventing COPI-mediated intracellular retention. Here we examined whether such a mechanism is involved in the quality control of the heterodimeric G protein-coupled GABAB receptor. Its GB1 subunit, carrying the retention signal RSR, only reaches the cell surface when associated with the GB2 subunit. We show that COPI and 14-3-3 specifically bind to the GB1 RSR sequence and that COPI is involved in its intracellular retention. However, we demonstrate that the interaction with 14-3-3 is not required for proper function of the GABAB receptor quality control. Accordingly, competition between 14-3-3 and COPI cannot be considered as a general trafficking control mechanism. A possible other role for competition between COPI and 14-3-3 binding is discussed.

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  • RRQR motifs are thought to prevent the exit of cargo from the ER and may additionally function as ER retrieval motifs via the binding of the RRXR domain to COPI proteins.

    “RRQR motifs are thought to prevent the exit of cargo from the ER and may additionally function as ER retrieval motifs via the binding of the RRXR domain to COPI proteins (Scott et al., 2001, 2003; Brock et al., 2005; Michelsen et al., 2005).”

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  1. Villemure, J.-F., Adam, L., Bevan, N. J., Gearing, K., Chénier, S., and Bouvier, M. (2005). Sub-cellular distribution of GABAB receptor homo- and heterodimers. Biochem. J. 388, 47–55. [DOI] [PMC free article] [PubMed] [Google Scholar]

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Authors
Brock, C., Boudier, L., Maurel, D., Blahos, J., & Pin, J.-P.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • CNRS UMR5203, Montpellier F-34094 France
Venue
Molecular Biology of the Cell
Published
2005-12
Volume
16
Issue
12
Pages
5572-5578
ISSN
  • 1059-1524 (ISSN-L)
  • 1939-4586
OpenAlex
W2147149270
Cited by
81
References
30
Citations by year
2025: 2 · 2024: 2 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 5 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 5 · 2014: 8 · 2013: 2 · 2012: 6
FWCI
3.53
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology of the Cell (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
  • HAL (submittedVersion, other-oa)
Funders
  • Institut National de la Santé et de la Recherche Médicale
  • Centre National de la Recherche Scientifique
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › 14-3-3 protein interactions
Keywords
GABAB receptors, COPI, 14-3-3 proteins, cell surface targeting, intracellular retention, protein assembly, protein trafficking
MeSH terms
Biological Transport, Cell Line, Cell Membrane, Cloning, Molecular, Humans, Kidney, Kinetics, Transfection, Polymerase Chain Reaction, Receptors, GABA-B, Microscopy, Confocal, Dimerization, Coat Protein Complex I, 14-3-3 Proteins

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