Molecular Organization, Trafficking, and Degradation of the GABAB Receptor

  • Dietmar Benke
  • Karthik Balakrishnan
  • Khaled Zemoura
Chapter
First Online:
Part of the The Receptors book series (REC, volume 29)

Abstract

GABAB receptors are heterodimeric G protein-coupled receptors composed of the two seven transmembrane spanning proteins GABAB1 and GABAB2. They are expressed in the vast majority of neurons and primarily regulate neuronal excitability via several distinct effector systems. There is evidence that GABAB receptors are organized in large macromolecular complexes composed of accessory and effector proteins to ensure efficient signaling. Communication through and regulation of GABAB receptors is determined by a constantly growing list of interacting proteins. In particular, trafficking events that regulate the cell surface availability of the receptors and thereby their signaling strength are controlled by protein–protein interactions that often convey posttranslational modifications such as phosphorylation or ubiquitination. Understanding the mechanisms regulating GABAB receptor availability is of major importance since it is increasingly recognized that aberrant regulation of GABAB receptor cell surface expression contributes to disease states including addiction, cerebral ischemia, and chronic pain. Here we briefly review our current understanding of the macromolecular structural organization of GABAB receptor complexes and the regulation of cell surface receptor availability by trafficking events and controlled receptor degradation.

Keywords

GABAB receptor Trafficking Interacting proteins Lysosomal degradation Proteasomal degradation 
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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Dietmar Benke
    • 1
  • Karthik Balakrishnan
    • 1
  • Khaled Zemoura
    • 1
  1. 1.Institute of Pharmacology and ToxicologyUniversity of ZurichZurichSwitzerland

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