固体NMRからのインフルエンザM2陽子チャネルにおける陽子伝導とゲーティングのメカニズム
Fanghao Hu1, Wenbin Luo, Mei Hong
1Department of Chemistry, Iowa State University, Ames, IA 50011, USA.
まとめ
インフルエンザM2タンパク質は,
科学分野:
- バイオフィジックス 生物物理学
- ウイルス学 ウイルス学 ウイルス学
- 構造生物学 構造生物学とは
背景:
- インフルエンザウイルスは,複製のためにM2タンパク質の陽子チャネルに依存しています.
- M2陽子チャネルメカニズムを理解することは,抗ウイルス薬の開発に不可欠です.
研究 の 目的:
- M2陽子チャンネルにおけるpH感知ヒスティジン-37の構造と動態を解明する.
- M2チャネル内の陽子伝導機構を理解するために.
主な方法:
- 固体核磁気共鳴 (ssNMR) スペクトロスコーピー. 固体核磁気共鳴 (ssNMR) スペクトロスコーピー. 固体核磁気共鳴 (ssNMR) スペクトロスコーピー. 固体核磁気共鳴 (ssNMR) スペクトロスコーピー. 固体核磁気共鳴 (ssNMR) スペクトロスコーピー.
- コレステロールを含むウイルス-封筒-模倣膜を使用しました.
主要な成果:
- 高 pH で,ヒスティジンの残留物は,陽子の流れを遮断する π 積み重ねの構造を形成します.
- 低pH下では,ヒスティジンイミダゾリウムが水と水素結合を形成し,リングの方向転換を経験します.
- ヒスティジン環の方向転換に対する高エネルギーバリア (>59 kJ/mol) が観察され,これは陽子の伝導率と相関している.
結論:
- 速度を制限するステップとしてリング・フリップ・アシストされたイミダゾールデプロトネーションを含む陽子伝導機構を提案する.
- ヒスティジン-37は,ビリオンへの陽子輸送を動的に促進する.
関連する概念動画
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...
Mechanically-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...
Mechanically-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...
Ligand-gated Ion Channels
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 include the...
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 include 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.
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.

