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Determination of the minimal functional ligand-binding domain of the GABAB1b receptor

Deriu, Daniela and Gassmann, Martin and Firbank, Susan and Ristig, Dorothee and Lampert, Christina and Mosbacher, Johannes and Froestl, Wolfgang and Kaupmann, Klemens and Bettler, Bernhard and Grütter, Markus G.. (2005) Determination of the minimal functional ligand-binding domain of the GABAB1b receptor. The biochemical journal, Vol. 386, H. Pt. 3. pp. 423-431.

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Official URL: http://edoc.unibas.ch/dok/A5262243

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Abstract

In the mammalian central nervous system, slow inhibitory neurotransmission is largely mediated by metabotropic GABA(B) receptors (where GABA stands for gamma-aminobutyric acid), which belong to the G-protein-coupled receptor gene family. Functional GABA(B) receptors are assembled from two subunits GABA(B1) (GABA(B) receptor subtype 1) and GABA(B2). For the GABA(B1) subunit, which binds the neurotransmitter GABA, two variants GABA(B1a) (GABA(B) receptor subtype 1 variant a) and GABA(B1b) have been identified. They differ at the very N-terminus of their large glycosylated ECD (extracellular domain). To simplify the structural characterization, we designed truncated GABA(B1) receptors to identify the minimal functional domain which still binds a competitive radioligand and leads to a functional, GABA-responding receptor when co-expressed with GABA(B2). We show that it is necessary to include all the portion of the ECD encoded by exon 6 to exon 14. Furthermore, we studied mutant GABA(B1b) receptors, in which single or all potential N-glycosylation sites are removed. The absence of oligosaccharides does not impair receptor function, suggesting that the unglycosylated ECD of GABA(B1) can be used for further functional or structural investigations.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Division of Physiology > Molecular Neurobiology Synaptic Plasticity (Bettler)
UniBasel Contributors:Bettler, Bernhard
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Portland Press
ISSN:0264-6021
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:24
Deposited On:22 Mar 2012 13:37

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