インフルエンザウイルスのM2タンパク質には,イオンチャネル活性があります
L H Pinto1, L J Holsinger, R A Lamb
1Department of Neurobiology and Physiology, Northwestern University, Evanston, Illinois 60208-3500.
Cell
|May 1, 1992
まとめ
インフルエンザM2タンパク質は,ウイルス生物学にとって極めて重要なイオンチャネルを形成します. 抗ウイルス薬であるアマンタジンは,このチャネルを標的とし,抵抗性の変異がチャネルの毛穴構造を強調します.
科学分野:
- ウイルス学 ウイルス学 ウイルス学
- 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:
- インフルエンザウイルスのM2タンパク質は,抗ウイルス薬の標的として知られている.
- M2タンパク質の構造と機能を理解することは,新しいインフルエンザ治療の開発の鍵です.
研究 の 目的:
- インフルエンザウイルスのM2タンパク質のイオンチャネル活動を特徴づけるために.
- アマンタジン塩化水素のM2イオンチャネルへの作用メカニズムを調査する.
- インフルエンザウイルスのアマンタジン耐性の構造的基礎を決定する.
主な方法:
- インフルエンザウイルスのM2タンパク質のXenopus laevis卵細胞における発現.
- イオンチャネル活動を測定するための電気生理学的記録.
- アマンタジン耐性M2変異種を生成するためのサイト指向型変異.
- チャンネル活性に関するpH依存性研究.
主要な成果:
- M2タンパク質は,卵細胞における単価イオン選択チャネル活性を示している.
- アマンタジン塩化水素は,M2チャンネル電流を著しく抑制しました.
- アマンタジンに耐性を与える変異は,薬剤耐性チャンネル活性をもたらした.
- 分析により,トランスメブラン領域がM2チャネルポールを形成することを示唆しています.
- 野生型のM2チャネル活動は,pHによって調節されます.
結論:
- インフルエンザM2タンパク質は,pH調節イオンチャネルとして機能する.
- 超膜ドメインは,M2チャネルポールの形成に不可欠です.
- M2イオンチャネルは,インフルエンザウイルス感染において重要な役割を果たします.
- これらの発見は,抗ウイルス薬のメカニズムと耐性についての洞察を提供します.
関連する概念動画
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...
Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Voltage-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...
Voltage-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...
Influenza
Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
Inhibitors Of Virion Release
Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...


