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• W1541251570 abstract "In a recent study we have provided evidence that inhibition of native GABA(A) receptors by zinc depends primarily on the allosteric modulation of receptor gating. Both the kinetics and the sensitivity of the GABA(A) receptor to zinc depend on subunit composition, especially on the presence of the gamma(2) subunit. To analyze the mechanism of action of zinc its effects have been tested on recombinant alpha(1)beta(2)gamma(2) and alpha(1)beta(2) receptors expressed in HEK 293 cells. The currents produced by ultrafast application of GABA have been measured to assess the impact of zinc ions on GABA(A) receptor gating with resolution corresponding to the time scale of synaptic currents. While, as expected, zinc markedly reduced the peak amplitude of alpha(1)beta(2)-mediated currents, its effect on kinetics was significantly different from that observed for alpha(1)beta(2)gamma(2). In particular, unlike alpha(1)beta(2)gamma(2), zinc did not affect the onset of alpha(1)beta(2)-mediated responses. Moreover, zinc increased the extent of desensitisation of alpha(1)beta(2)gamma(2) receptors and reduced desensitisation of alpha(1)beta(2) ones. Quantitative analysis suggests that zinc exerts an allosteric modulation on both alpha(1)beta(2)gamma(2) and alpha(1)beta(2) receptors. Zinc effects on alpha(1)beta(2)gamma(2) were qualitatively similar to those reported for native receptors." @default.
• W1541251570 created "2016-06-24" @default.
• W1541251570 creator A5020100632 @default.
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• W1541251570 date "2002-09-01" @default.
• W1541251570 modified "2023-10-16" @default.
• W1541251570 title "Allosteric interaction of zinc with recombinant α1β2γ2 and α1β2 GABAA receptors" @default.
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• W1541251570 doi "https://doi.org/10.1016/s0028-3908(02)00109-0" @default.
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