クランプの開き:ATP駆動の生物学的機械の親密な眺め
1Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
Cell
|September 27, 2001
まとめ
DNAポリメラーゼは,複製中にDNAに留まるために,リング状のクランプのような補助因子を必要とします. 最近の構造の研究は,クランプローダの機械が,これらの重要なクランプをDNAに結合させる方法を明らかにしています.
科学分野:
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
- バイオケミストリー バイオケミストリー
背景:
- DNAポリメラーゼは,DNA複製に不可欠な酵素である.
- DNAポリメラーゼのプロセシビティは,スライディングクランプなどの付属因子によってしばしば媒介されます.
- クランプロードは,これらのスライディングクランプをDNAにロードするために不可欠です.
研究 の 目的:
- DNAにクランプが負荷されるメカニズムを解明する.
- クランプロードヤー,クランプ,DNAの相互作用に関する構造的な洞察を提供するためです.
主な方法:
- X線結晶グラフィーです.
- クリオ電子顕微鏡では,
- 構造分析 構造分析とは
主要な成果:
- DNAとクランプに結合したクランプローダー複合体の詳細な構造を決定した.
- クランプの負荷処理中の主要な形状の変化が視覚化されました.
- DNAのクランプ包囲を促進する相互作用が特定されました.
結論:
- 研究は,DNAポリメラーゼのプロセシビティに責任を負う複雑な分子機構を明らかにしています.
- クランプの負荷を理解することは,DNA複製の忠実性と規制に関する洞察を提供します.
- これらの発見は,基本的なDNA複製過程の構造的理解に貢献します.
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関連する概念動画
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
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...
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 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...
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...
