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• W2149385826 abstract "The Cys-loop family of receptors mediates synaptic neurotransmission in the central nervous system of vertebrates. These receptors share several structural characteristics and assemble in the plasma membrane as multimers with fivefold symmetry. Of these, the ionotropic GABA receptors are key players in the pathogenesis of diseases like epilepsy, anxiety, and schizophrenia. Different experimental approaches have shed some light on the mechanisms behind the function of these receptors; but little is known about their structure at high resolution. Sequence homology with the nicotinic acetylcholine receptor predicts that ionotropic GABA receptors possess four transmembrane segments (TM1-4) and that TM2 forms the wall of the ion channel. However, the role of the other three segments is unclear. The GABAρ1 receptor plays a fundamental role in the regulation of neurotransmission along the visual pathway, is highly sensitive to GABA, and exhibits little desensitization. In our recent investigations of the role of TM4 in receptor function, a key residue in this domain (W475) was found to be involved in activation of the receptor. Here we have generated a structural model of the GABAρ1 receptor in silico and assessed its validity by electrophysiologically testing nine amino acid substitutions of W475 and deletions of the neighboring residues (Y474 and S476). The results identify a critical linkage between the ligand-binding domain and the TM4 domain and provide a framework for more detailed structure-function analyses of ionotropic GABA receptors." @default.
• W2149385826 created "2016-06-24" @default.
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• W2149385826 date "2010-09-27" @default.
• W2149385826 modified "2023-10-17" @default.
• W2149385826 title "Structure-function study of the fourth transmembrane segment of the GABAρ1 receptor" @default.
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• W2149385826 doi "https://doi.org/10.1073/pnas.1012540107" @default.
• W2149385826 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2955090" @default.
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