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• W1974037492 endingPage "1522" @default.
• W1974037492 startingPage "1514" @default.
• W1974037492 abstract "3-(Trifluoromethyl)-3-(m-[(125)I]iodophenyl)diazirine ([(125)I]TID) and [(3)H]tetracaine, an aromatic amine, are noncompetitive antagonists (NCAs) of the Torpedo species nicotinic acetylcholine receptor (nAChR), which have been shown by photoaffinity labeling to bind to a common site in the ion channel in the closed state. Although tetracaine and TID bind to the same site, the amine NCAs phencyclidine (PCP) and histrionicotoxin (HTX), which are also believed to bind within the ion channel, interact competitively with tetracaine but allosterically with TID. To better characterize drug interactions within the nAChR ion channel in the closed state, we identified the amino acids photoaffinity labeled by [(125)I]TID in the presence of tetracaine, PCP, or HTX. In the absence of other drugs, [(125)I]TID reacts with alphaLeu-251 (alphaM2-9) and alphaVal-255 (alphaM2-13) and the homologous residues in each of the other subunits. None of the NCAs shifted the sites of [(125)I]TID labeling to other residues within the ion channel. Tetracaine inhibited [(125)I]TID labeling of M2-9 and M2-13 without changing the relative(125)I incorporation at these positions, whereas PCP and HTX each altered the pattern of [(125)I]TID incorporation at M2-9 and M2-13. These results indicate that tetracaine and TID bind in a mutually exclusive manner to a common site in the closed channel that is spatially separated from the binding sites for PCP and HTX." @default.
• W1974037492 created "2016-06-24" @default.
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• W1974037492 date "2001-06-01" @default.
• W1974037492 modified "2023-09-23" @default.
• W1974037492 title "Interactions between 3-(Trifluoromethyl)-3-(m-[¹²⁵I]iodophenyl)diazirine and Tetracaine, Phencyclidine, or Histrionicotoxin in the<i>Torpedo</i>Species Nicotinic Acetylcholine Receptor Ion Channel" @default.
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• W1974037492 doi "https://doi.org/10.1124/mol.59.6.1514" @default.
• W1974037492 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11353813" @default.
• W1974037492 hasPublicationYear "2001" @default.
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