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Crown Ethers02:36

Crown Ethers

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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Highly Selective Artificial Cholesteryl Crown Ether K(+)-Channels.

Zhanhu Sun1, Mihail Barboiu2, Yves-Marie Legrand1

  • 1Adaptive Supramolecular Nanosystems Group, Institut Européen des Membranes, ENSCM-UM-CNRS UMR-5635, Place E. Bataillon, CC 047, F-34095, Montpellier Cedex 5 (France).

Angewandte Chemie (International Ed. in English)
|October 7, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created an artificial ion channel using crown-ethers that mimics the KcsA channel. This biomimetic channel selectively conducts potassium (K+) over sodium (Na+) ions.

Keywords:
biomimeticscrown ethershydrogen bondingion channelsself-assembly

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Area of Science:

  • Biomimetic chemistry
  • Ion channel research
  • Supramolecular chemistry

Background:

  • The bacterial KcsA channel is known for its high selectivity in conducting potassium (K+) ions while excluding sodium (Na+) ions.
  • Understanding the mechanisms of ion selectivity in biological channels is crucial for developing artificial systems.

Purpose of the Study:

  • To design and characterize an artificial ion channel that mimics the selectivity of the bacterial KcsA channel.
  • To investigate the role of crown-ether macrocycles in achieving potassium (K+) over sodium (Na+) ion selectivity.

Main Methods:

  • Formation of an artificial ion channel using hydrogen-bonded stacks of crown-ethers.
  • Investigating ion conduction properties, specifically the selectivity between K+ and Na+ cations.

Main Results:

  • The artificial channel demonstrated highly preferred conduction of K+ cations over Na+ cations.
  • The crown-ether macrocycles effectively surrounded K+ ions, compensating for dehydration energy, unlike with Na+ ions.

Conclusions:

  • The developed crown-ether based macrocyclic channel acts as a biomimetic of the KcsA channel.
  • This artificial channel provides a model system for understanding and replicating biological ion selectivity.