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- W2063313299 abstract "Molecular mechanisms of zinc potentiation were investigated in recombinant human alpha1 glycine receptors (GlyRs) by whole-cell patch-clamp recording and [3H]strychnine binding assays. In the wild-type (WT) GlyR, 1 microM zinc enhanced the apparent binding affinity of the agonists glycine and taurine and reduced their concentrations required for half-maximal activation. Thus, in the WT GlyR, zinc potentiation apparently occurs by enhancing agonist binding. However, analysis of GlyRs incorporating mutations in the membrane-spanning domain M1-M2 and M2-M3 loops, which are both components of the agonist gating mechanism, indicates that most mutations uncoupled zinc potentiation from glycine-gated currents but preserved zinc potentiation of taurine-gated currents. One such mutation in the M2-M3 loop, L274A, abolished the ability of zinc to potentiate taurine binding but did not inhibit zinc potentiation of taurine-gated currents. In this same mutant where taurine acts as a partial agonist, zinc potentiated taurine-gated currents but did not potentiate taurine antagonism of glycine-gated currents, suggesting that zinc interacts selectively with the agonist transduction pathway. The intracellular M246A mutation, which is unlikely to bind zinc, also disrupted zinc potentiation of glycine currents. Thus, zinc potentiation of the GlyR is mediated via allosteric mechanisms that are independent of its effects on agonist binding." @default.
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- W2063313299 date "2002-11-13" @default.
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- W2063313299 title "Zinc Potentiation of the Glycine Receptor Chloride Channel Is Mediated by Allosteric Pathways" @default.
- W2063313299 doi "https://doi.org/10.1046/j.1471-4159.1998.71052159.x" @default.
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