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- W2057210366 abstract "Novel artificial ion channels (1 and 2) based on CB[n] (n = 6 and 5, respectively) synthetic receptors with carbonyl-fringed portals (diameter 3.9 and 2.4 Å, respectively) can transport proton and alkali metal ions across a lipid membrane with ion selectivity. Fluorometric experiments using large unilamellar vesicles showed that 1 mediates proton transport across the membranes, which can be blocked by a neurotransmitter, acetylcholine, reminiscent of the blocking of the K+ channels by polyamines. The alkali metal ion transport activity of 1 follows the order of Li+ > Cs+ ≈ Rb+ > K+ > Na+, which is opposite to the binding affinity of CB[6] toward alkali metal ions. On the other hand, the transport activity of 2 follows the order of Li+ > Na+, which is also opposite to the binding affinity of 2 toward these metal ions, but virtually no transport was observed for K+, Rb+, and Cs+. It is presumably because the carbonyl-fringed portal size of 2 (diameter 2.4 Å) is smaller than the diameters of these alkali metal ions. To determine the transport mechanism, voltage-clamp experiments on planar bilayer lipid membranes were carried out. The experiments showed that a single-channel current of 1 for Cs+ transport is ∼5 pA, which corresponds to an ion flux of ∼3 × 107 ions/s. These results are consistent with an ion channel mechanism. Not only the structural resemblance to the selectivity filter of K+ channels but also the remarkable ion selectivity makes this model system unique." @default.
- W2057210366 created "2016-06-24" @default.
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- W2057210366 date "2004-11-13" @default.
- W2057210366 modified "2023-10-12" @default.
- W2057210366 title "Artificial Ion Channel Formed by Cucurbit[<i>n</i>]uril Derivatives with a Carbonyl Group Fringed Portal Reminiscent of the Selectivity Filter of K<sup>+</sup>Channels" @default.
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- W2057210366 doi "https://doi.org/10.1021/ja044748j" @default.
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