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• W1991972341 startingPage "1361" @default.
• W1991972341 abstract "Inflammatory pain sensitization is initiated by prostaglandin-induced phosphorylation of α3 glycine receptors (GlyRs) that are specifically located in inhibitory synapses on spinal pain sensory neurons. Phosphorylation reduces the magnitude of glycinergic synaptic currents, thereby disinhibiting nociceptive neurons. Although α1 and α3 subunits are both expressed on spinal nociceptive neurons, α3 is a more promising therapeutic target as its sparse expression elsewhere implies a reduced risk of side-effects. Here we compared glycine-mediated conformational changes in α1 and α3 GlyRs to identify structural differences that might be exploited in designing α3-specific analgesics. Using voltage-clamp fluorometry, we show that glycine-mediated conformational changes in the extracellular M2-M3 domain were significantly different between the two GlyR isoforms. Using a chimeric approach, we found that structural variations in the intracellular M3-M4 domain were responsible for this difference. This prompted us to test the hypothesis that phosphorylation of S346 in α3 GlyR might also induce extracellular conformation changes. We show using both voltage-clamp fluorometry and pharmacology that Ser346 phosphorylation elicits structural changes in the α3 glycine-binding site. These results provide the first direct evidence for phosphorylation-mediated extracellular conformational changes in pentameric ligand-gated ion channels, and thus suggest new loci for investigating how phosphorylation modulates structure and function in this receptor family. More importantly, by demonstrating that phosphorylation alters α3 GlyR glycine-binding site structure, they raise the possibility of developing analgesics that selectively target inflammation-modulated GlyRs." @default.
• W1991972341 created "2016-06-24" @default.
• W1991972341 creator A5005786535 @default.
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• W1991972341 date "2013-07-18" @default.
• W1991972341 modified "2023-10-18" @default.
• W1991972341 title "Phosphorylation of α3 Glycine Receptors Induces a Conformational Change in the Glycine-Binding Site" @default.
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• W1991972341 doi "https://doi.org/10.1021/cn400097j" @default.
• W1991972341 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3798985" @default.
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