関連する実験動画
Updated: May 12, 2026
16:36
Proteomics to Identify Proteins Interacting with P2X2 Ligand-Gated Cation Channels
Published on: May 19, 2009
P2X受容体におけるATP結合とイオンチャネル活性化の分子機構
Motoyuki Hattori1, Eric Gouaux
1Vollum Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, USA.
Nature
|April 27, 2012
まとめ
研究者らは,ゼブラフィッシュのP2X4受容体の構造を明らかにし,ATP結合部位とオープンイオンチャネル孔を詳細に説明しました. これは,薬物開発のためのATP依存性イオンチャネルゲーティングメカニズムに関する重要な洞察を提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 神経科学は神経科学である.
背景:
- P2X受容体は,様々な生理学的プロセスに不可欠なトリメアATPゲートイオンチャネルです.
- その構造,特にATP結合部位とゲーティングメカニズムを理解することは,薬理学にとって不可欠です.
研究 の 目的:
- 斑馬魚のP2X4受容体の3次元構造を決定する.
- ATPに依存したイオンチャネルゲートの構造的メカニズムを解明する.
- オープンイオンチャネルポールのアーキテクチャを特徴付けるために.
主な方法:
- ゼブラフィッシュのP2X4受容体の構造を取得するために,X線結晶学を用いた.
- アポ受容体とATPとの複合体内の受容体の両方の構造が決定されました.
主要な成果:
- ゼブラフィッシュのP2X4受容体とATPの複合体の結晶構造は,新しいATP結合モチーフと開かれたイオンチャネル孔を明らかにした.
- ATP結合は,裂口の閉塞と細胞外ベスティビュールの放射的な膨張を含む構造変化を誘導する.
- イオンチャネル孔の開口は,トランスメブランヘリックス膨張による前庭の拡大と結合しています.
結論:
- この研究は,P2X4受容体のATP結合部位とオープンイオンチャネル孔に関する最初の構造的洞察を提供します.
- この発見は,ATPに依存したイオンチャネルゲートのメカニズムを明らかにしています.
- この構造情報は,P2X受容体を標的とする新薬学的薬剤の開発を容易にするでしょう.
関連する概念動画
01:27ATP Driven Pumps I: An Overview
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
01:48ATP Synthase: Mechanism
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...
01:34ATP Driven Pumps II: P-type Pumps
The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
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...
01:30Ligand-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...
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...