F1-ATPaseによるATPの合成と水解のための構造ベースのモデル
Yi Qin Gao1, Wei Yang, Martin Karplus
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Cell
|October 22, 2005
まとめ
ナノスケールの回転モーターであるF1-ATPaseは,ATPを効率的に合成します. そのメカニズムは,ATPの合成と水解のための明確なタンパク質構成を含み,細胞のATPレベルがATPの機能を抑制しない理由を説明します.
科学分野:
- バイオケミストリー バイオケミストリー
- 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:
- 細胞の機能は,ナノスケールのタンパク質モーターに依存しています.
- F (((o) F1-ATP合成酵素は,最小の回転モーターであり,細胞のエネルギー生産における重要な酵素です.
- 高濃度の製品でも効率的にATPを合成します.
研究 の 目的:
- F1-ATPaseメカニズムのための詳細な構造ベースの運動モデルを開発する.
- ATP合成と水解の間に基板結合におけるタンパク質構成の役割を明らかにする.
- 細胞のATP濃度に対するATP合成の無感性を説明するために.
主な方法:
- 詳細な構造ベースの運動モデリング.
- タンパク質構成と基板結合ダイナミクスの分析.
- ATP合成と水解経路のシミュレーション.
主要な成果:
- 運動モデルは,ATP合成と水解の異なる経路を示しています.
- 異なるタンパク質構成は,両方向に基板結合に不可欠です.
- このモデルは,高い細胞ATP濃度がATP合成を阻害しない理由を説明しています.
結論:
- F1-ATPaseは,形状の変化を含む複雑なメカニズムを通じて動作します.
- ATP合成と水解の経路は,互いに単純に逆転しているわけではありません.
- 酵素の設計は,生理学的条件下で効率的なATP生成を保証します.
関連する概念動画
Hydrolysis of ATP
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
Hydrolysis of ATP
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
ATP 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...
ATP Synthase: Mechanism
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ATP Synthase: Structure
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
ATP Driven Pumps III: V-type Pumps
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...


