Potassium channels allow the passage of potassium ions across membranes at rates approaching the diffusion limit while maintaining exquisite selectivity between ion species. Single-molecule studies now reveal that the selectivity filter of these proteins transitions between different conformations.
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Gross, A. A flexible filter maintains a tight grip. Nat Chem Biol 15, 319–320 (2019). https://doi.org/10.1038/s41589-019-0248-z
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DOI: https://doi.org/10.1038/s41589-019-0248-z
