関連する実験動画
Updated: Aug 3, 2026

06:48
CD Spectroscopy to Study DNA-Protein Interactions
Published on: February 10, 2022
ウサギの筋肉サルコプラズマの網膜から Ca2+ + Mg2+依存性ATPアゼのアミノ酸配列は,その補完的なDNA配列から推論された
Nature
|August 22, 1985
まとめ
研究者らは,ウサギの筋肉サルコプラズマ網膜のCa2+-ATPaseをクローンし,配列化しました. 提案されたモデルは,カルシウムイオン輸送を説明するために,細胞質ドメインと超膜ヘリクスを含む,その構造を詳細に説明しています.
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.
- 構造生物学 構造生物学とは
背景:
- サルコプラズマ網膜のCa2+-ATPase (SERCA) は,カルシウムイオンをサルコプラズマ網膜にポンプすることにより,筋肉の収縮に不可欠です.
- Ca2+-ATPaseの構造を理解することは,その機能と調節を解明するために不可欠です.
研究 の 目的:
- ウサギの筋肉サルコプラズマの網膜をコードする補完DNA (cDNA) Ca2+-ATPaseをクローンし,配列化する.
- 得られた配列に基づいてCa2+-ATPaseの構造モデルを提案する.
主な方法:
- 補完的なDNA (cDNA) クローンとシーケンシング技術が採用されました.
- 生物情報分析とタンパク質モデリングを使用して,構造的仮説を開発しました.
主要な成果:
- ウサギの筋肉のサルコプラズマ網膜をコードするcDNA (Ca2+-ATPase) がクローンされ,順番が決定されました.
- 構造モデルが提案され,3つのサイトプラズマドメインがペンタヘリケスの茎を通して10のトランスメブランヘリクにつながっている.
結論:
- 提案されたモデルは,ATP結合とリン酸化がどのようにCa2+を膜全体に転移させるかを理解するための枠組みを提供します.
- この構造的な洞察は,Ca2+-ATPaseによって媒介されるカルシウムイオン輸送のメカニズムを理解するのに役立ちます.
関連する概念動画
From DNA to Protein
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ATP Synthase: Mechanism
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The ADP/ATP Carrier Protein
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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...
Allosteric Proteins-ATCase
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...

