人工塩素選択チャネル:形状と機能は,ClCチャネル選択孔を模倣する
Wen-Long Huang1,2, Xu-Dong Wang1, Yu-Fei Ao1
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Journal of the American Chemical Society
|July 22, 2020
まとめ
研究者はアニオン-π相互作用を使用して効率的な塩化物輸送のためにClCチャネルを模倣する人工チャネル分子を開発した. この合成イオントランスポーターは,生物膜モデルで高い活性と選択性を示しています.
科学分野:
- 超分子化学
- 化学生物学
- 膜生物物理学
背景:
- クロリドチャネル (ClC) は重要な生物伝達物質である.
- 合成分子でClCチャネル機能を模倣することは困難です.
- イオン輸送メカニズムを理解するには 精密な分子設計が必要です
研究 の 目的:
- ClCチャネル選択孔を模倣する人工チャネル分子を設計し合成する.
- アニオン-π相互作用を単分子塩化物輸送の非共性推進力として利用する.
- 設計された分子のイオン輸送効率と選択性を評価する.
主な方法:
- 砂時計のような構造を持つ人工チャネル分子の合成 (1).
- 膀と黒い脂質膜 (BLM) 技術を用いたイオン輸送測定法.
- 活性評価のための光分析と伝導性と選択性の測定のためのBLM.
主要な成果:
- 分子は高活性 (EC50 = 1.50 μM) の塩化物イオンを効率的に輸送する.
- BLM測定は,特定の伝導値を持つイオンチャネル特性を確認しました.
- 陽離子/陽離子選択性 (PCl-/PK+=1.90) と陽離子/陽離子選択性 (PCl-/PBr-=22.83) を実証した.
結論:
- 人工チャネル分子は ClCチャネル機能を成功裏に模倣しています.
- アニオン-π相互作用は,単分子塩化物輸送を効率的に駆動する.
- 設計された分子は,様々な用途のための選択的イオントランスポーターとしての可能性を示しています.
関連する概念動画
Ion Channels
90.7K
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...
90.7K
Ligand-gated Ion Channels
13.7K
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.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
13.7K
Ligand-Gated Ion Channel Receptor: Gating Mechanism
3.5K
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...
3.5K
Patch Clamp
6.1K
Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
6.1K
Non-gated Ion Channels
7.8K
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....
7.8K
Electrochemical Gradient and Channel Proteins: An Overview
4.1K
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
4.1K


