スモイレーションは,プラズマ膜の漏れであるK+チャンネルK2P1を静止させます
Sindhu Rajan1, Leigh D Plant, Michael L Rabin
1Department of Pediatrics, Institute for Molecular Pediatric Sciences, Pritzker School of Medicine, University of Chicago, 5721 South Maryland Avenue, Chicago, Illinois 60637, USA.
Cell
|April 12, 2005
まとめ
小型のユビキチン関連変容体 (SUMO) 経路は,プラズマ膜のイオンチャネル機能を調節する. K2P1のSUMO改変により,pHに敏感なカリウムチャネルであることが明らかになる.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- バイオフィジックス 生物物理学
背景:
- 小型ユビキチン関連改変体 (SUMO) タンパク質は,転写因子活性と核伝搬を調節する.
- プラズマ膜タンパク質機能,特にイオンチャネルを制御するSUMOylationの役割は,ほとんど未知のままです.
研究 の 目的:
- プラズマ膜におけるイオンチャネル機能を調節するSUMO経路の役割を調査する.
- 重要な組織で発現しているにもかかわらず,以前は特徴づけられなかったK2P1チャネルの機能を特徴付ける.
主な方法:
- SUMO結合酵素相互作用とK2P1.1.の相互作用を検出するための免疫プレシピテーション.
- SUMOylation site (ライシン274) を特定するためのサイト指向型ミュータゲネシス.
- SUMOylation/desUMOylation前と後のK2P1チャネル活動を評価するための電気生理学的記録.
主要な成果:
- SUMO結合酵素は,プラズマ膜に局所化し,ライシン274.4でK2P1を改変する.
- K2P1は,二孔ドメインのカリウムチャネルであり,pHに敏感であり,deSUMOylation時に内側にK+伝導性を修正します.
- SUMOylationは,K2P1チャネル活動を逆向きに調節する.
結論:
- SUMO経路は,プラズマ膜のイオンチャネル機能の新たな調節剤である.
- K2P1は,反転性SUMOylationによって調節される,機能的でpHに敏感なカリウムチャンネルです.
- この発見は,細胞の興奮性とイオン輸送を理解するための新しい道を開きます.
関連する概念動画
The Resting Membrane Potential
Overview
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.
Resting Membrane Potential
The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
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.
Ligand-Gated Ion Channel Receptor: Gating Mechanism
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...
Resting Membrane Potential
The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...


