関連する実験動画
Updated: Jul 9, 2026

10:05
In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
Published on: August 13, 2012
CFTRチャネルは,そのヌクレオチド結合ドメインのATP駆動の緊密な二分化によって開きます
Paola Vergani1, Steve W Lockless, Angus C Nairn
1Laboratory of Cardiac/Membrane Physiology, The Rockefeller University, New York, New York 10021, USA. paola.vergani@rockefeller.edu
Nature
|February 25, 2005
まとめ
性線維症のトランスメブラン伝導性調節器 (CFTR) のイオンチャネルは,その нуклеотиド結合ドメインがATPによって駆動され,緊密に二酸化すると開きます. この二重化プロセスは,ABCタンパク質のイオン輸送の調節に極めて重要です.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- バイオフィジックス 生物物理学
背景:
- ATP結合カセット (ABC) タンパク質は膜輸送体である.
- 胞性線維症のトランスメブラン伝導性調節器 (CFTR) は,イオンチャネルとして機能するユニークなABCタンパク質です.
- CFTRのイオンチャネル活動は,そのヌクレオチド結合ドメイン (NBD) のATP結合と水解によって調節されます.
研究 の 目的:
- CFTRのNBDにおけるATP媒介のイベントを,そのイオンチャネルポールの開閉と直接リンクさせる.
- CFTRチャネルゲーティングにおけるNBDダイメリゼーションの役割を調査する.
主な方法:
- 無傷のCFTR分子にシングルチャネルの記録.
- NBD1とNBD2の特定の残留物間のエネルギー結合の監視.
主要な成果:
- 予測されたNBD1-NBD2ダイマーインターフェースのCFTR残基間のエネルギー結合は,チャネルゲーティングで変化します.
- これらの残留物は,閉じたチャネルでは独立しているが,チャネル開通時に結合する.
- NBDのATP駆動による緊密な二分化は,イオンチャネル開通と直接関連しています.
結論:
- CFTRのヌクレオチド結合ドメインのATP誘発による緊密な二酸化は,イオンチャネル開通に不可欠である.
- NBDダイマーインターフェースのダイナミックな再構築は,CFTRゲーティングの重要な分子メカニズムです.
- このメカニズムは,ABCタンパク質スーパーファミリー全体で保存されている可能性が高い.
関連する概念動画
Secondary Active Transport
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
Ion Channels
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 specific...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow specific...
Secondary Active Transport
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
Non-gated Ion Channels
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.
Non-gated Ion Channels
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.
Facilitated Diffusion
The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...

