高度に選択的な人工K ((+) チャンネル:選択性誘発型トランスメブランポテンシャルの一例
Arnaud Gilles1, Mihail Barboiu1,2
1Adaptive Supramolecular Nanosystems Group, Institut Européen des Membranes, ENSCM-UMII-CNRS UMR-5635 , Place Eugène Bataillon, CC 047, F-34095 Montpellier, France.
Journal of the American Chemical Society
|December 23, 2015
まとめ
研究者は天然のカリウム (K+) チャンネルを模倣した新しい人工イオンチャネルを開発しました. このバイオミメティックチャネルは,ナトリウム (Na+) イオンに対するK+の高い選択性を示し,高度な分離技術のための可能性を秘めています.
科学分野:
- 超分子化学
- バイオミメティック材料科学
- イオン輸送
背景:
- 自然のKcsA K+チャネルは,高いイオン輸送率と選択性を表しています.
- バイオミメティック人工チャネルは 自然チャネル機能を複製することを目的としています
- 単純な人工システムで高いK+/Na+選択性を達成することは依然として課題です.
研究 の 目的:
- 新しいバイオミテック人工イオンチャネルの設計と特徴付け
- 人工チャネルのK+/Na+選択性を調査する.
- 選択的イオン伝導の仕組みを理解する
主な方法:
- H結合ヘキシルベンゾウレイド-15-クラウン-5-エーテルベースの人工イオンチャネルの合成.
- 人工チャネルを組み込む膜の伝導度測定
- 異なる条件下でのイオン選択性の分析
主要な成果:
- 人工チャネルでは,K+カチオンがNa+カチオンに強い好みを示した.
- 高いK+/Na+選択性は,Na+が多すぎても観察された.
- チャネル伝導性は,協力的な小集団構造の形成に起因する.
- イオン輸送率を高めました
結論:
- 開発された人工イオンチャネルは,自然チャネルの選択的なK+伝導を効果的に模倣する.
- このチャネルは,K+の選択と輸送を促進するシネジスティックな適応行動を示します.
- この研究は,高度に選択的なK+輸送のための有望な単純な人工システムを提示しています.
関連する概念動画
Voltage-gated Ion Channels
13.0K
Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
13.0K
Voltage-gated Ion Channels
6.4K
6.4K
Non-gated Ion Channels
9.0K
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.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
9.0K
Non-gated Ion Channels
4.4K
4.4K
The Role of Ion Channels in Neuronal Computation
4.2K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
4.2K
Ion Channels
92.6K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
92.6K


