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Previous attempts to identify residues that line the pore of the cystic fibrosis transmembrane conductance regulator (CFTR) chloride channel have utilized cysteine-substituted channels in conjunction with impermeant, thiol-reactive reagents like MTSET+ and MTSES−. We report here that the permeant, pseudohalide anion [Au(CN)2]− can also react with a cysteine engineered into the pore of the CFTR channel...
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