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- W2155258540 abstract "Membrane ion channels activated by extracellular ATP (P2X receptors) are widely distributed in the nervous system. Their molecular architecture is fundamentally distinct from that of the nicotinic or glutamate receptor families. We have measured single-channel currents, spontaneous gating, and rectification of rat P2X2 receptor in which polar and charged residues of the second transmembrane domain (TM2) were systematically probed by mutagenesis. The results suggest that Asn 333 and Asp 349 lie respectively in external and internal vestibules. Substitutions at Asn 333 , Thr 336 , and Ser 340 were particularly likely to cause spontaneously active channels. At Thr 336 , Thr 339 , and Ser 340 , the introduction of positive charge (Arg, Lys, or His, or Cys followed by treatment with 2-aminoethyl methanethiosulphonate) greatly enhanced outward currents, suggesting that side-chains of these three residues are exposed in the permeation pathway of the open channel. These functional findings are interpreted in the context of the recently reported 3.1 Å crystal structure of the zebrafish P2X4.1 receptor in the closed state. They imply that the gate is formed by residues Asn 333 to Thr 339 and that channel opening involves a counter-clockwise rotation and separation of the TM2 helices." @default.
- W2155258540 created "2016-06-24" @default.
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- W2155258540 date "2009-11-11" @default.
- W2155258540 modified "2023-10-17" @default.
- W2155258540 title "Polar Residues in the Second Transmembrane Domain of the Rat P2X2 Receptor That Affect Spontaneous Gating, Unitary Conductance, and Rectification" @default.
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- W2155258540 doi "https://doi.org/10.1523/jneurosci.4403-09.2009" @default.
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