関連する実験動画
Updated: Jul 26, 2026
08:00
Patch Clamp Recording of Ion Channels Expressed in Xenopus Oocytes
Published on: October 16, 2008
Xenopusの卵細胞で異種多元カリウムチャネルの形成の証拠
E Y Isacoff1, Y N Jan, L Y Jan
1Howard Hughes Medical Institute, University of California, San Francisco.
Nature
|June 7, 1990
まとめ
カリウムチャネルには様々な機能があります. この研究では,異なるカリウムチャネルタンパク質が,異多複合チャネルに組み合わされ,遺伝子数だけを超えて機能的多様性を増加させることが示されています.
科学分野:
- 分子生物学は分子生物学である.
- 神経科学は神経科学である.
- バイオフィジックス 生物物理学
背景:
- カリウムチャネル (K+) は,神経細胞の機能的な多様性を有意に示しています.
- K+チャネルポリペプチドは,Na+とCa2+チャネルのアルファサブユニットと構造的に類似しています.
- これは,K+チャネルが複数のポリペプチドサブユニットから組み立てられる可能性があることを示唆しています.
研究 の 目的:
- シェイカーA型K+チャネルのサブユニット組成を調べる.
- 異なるチャネルポリペプチドからヘテロマルチマルチ K+ チャンネルが形成されるかどうかを判断する.
- ヘテロマルチメリゼーションと種間結合の機能的な影響を調査する.
主な方法:
- Xenopusの卵細胞におけるシェイカーK+チャネル遺伝子の発現.
- チャンネル運動学と薬理学の分析.
- 異なる種 (ドロソフィラとネズミ) の同類チャネルポリペプチドの共表現.
主要な成果:
- ゼノプスの卵細胞のシェイカーA型K+チャネルは,複数のシェイカーポリペプチドで構成されています.
- 異なるK+チャネルポリペプチドによって形成されたヘテロマルチメリックチャネルは,ホモマルチメリックチャネルと比較して変化した運動学と薬理学を示します.
- フルーツフライとネズミのK+チャネルポリペプチドは,一緒に組み立てることができます.
結論:
- K+チャネルポリペプチドのヘテロマルチメリゼーションは,機能的多様性を大幅に拡大します.
- この多様性は,遺伝子数と代替スプライシングだけで予測されるものを上回ります.
- K+チャネルアセンブリは,神経刺激性を微調整するメカニズムを提供します.
さらに関連する動画
10:19Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
Published on: January 10, 2011
07:24Xenopus Oocytes: Optimized Methods for Microinjection, Removal of Follicular Cell Layers, and Fast Solution Changes in Electrophysiological Experiments
Published on: December 31, 2016
関連する概念動画
01:24Non-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.
01:26Voltage-gated Ion Channels
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...
01:12Mechanically-gated Ion Channels
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
01:24Non-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.
01:26Voltage-gated Ion Channels
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...
01:12Mechanically-gated Ion Channels
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...