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Updated: Jun 30, 2026

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Microfluidic Mixers for Studying Protein Folding
Published on: April 10, 2012
4つの螺旋状のタンパク質束の急速な折りたたみ
Neelan J Marianayagam1, Farid Khan, Louise Male
1University of Cambridge, Centre for Protein Engineering, Department of Chemistry, Lensfield Road, Cambridge, CB2 1EW, United Kingdom.
Journal of the American Chemical Society
|August 15, 2002
まとめ
FK506-FKBP12結合領域 (FRB) タンパク質の折りたたみ経路は,折りたたみを遅らせるが,それでもタンパク質の急速な形成を可能にする,コンパクトな中間状態を伴う. この研究では,FRBの折り畳み動態を分析するために,運動と均衡の方法を使用しました.
科学分野:
- タンパク質の折り畳みダイナミクス
- タンパク質構造の生体物理学
- 全螺旋型タンパク質の運動学
背景:
- キナーゼFRAPのFK506-FKBP12結合ドメイン (FRB) は,上下4ヘリクサバンドルである.
- タンパク質の折り畳み経路を理解することは,分子生物学と薬剤開発において極めて重要です.
研究 の 目的:
- FRBタンパク質の折り畳み経路を調査する.
- FRBの折りたたみ中の中間状態の性質と役割を記述する.
- FRBの折りたたみ動態を,他の全ヘリコロールタンパク質と比較する.
主な方法:
- 均衡と運動の研究を組み合わせた.
- 速度の常数を使用して分析された化学的変性化.
- 水嫌性染料8-アニリノナフタレン-1スルフォネート (ANS) のリフォールディング実験.
- 中間物質に結合するANSの停止フローの光検出.
主要な成果:
- FRBの原発状態は,pH 6.0,10°Cで安定している (7 kcal mol(-1).
- 折りたたむ時に,デナチュラント濃度が低い状態で,おそらく誤折りたたまれたコンパクトな中間状態が満たされます.
- ANS結合は,停止フローによって検出される光変化を経験する中間状態を確認します.
- 水中の折りたたみと開く速度は,それぞれ~150~200s~-1と0.005~0.06s~-1である.
- 折りたたむための移行状態はコンパクトで,折りたたまれた表面面積の80%が埋まっている.
結論:
- FRBの折りたたみは,メタステーブルな中間物質によって遅くなりますが,それでも急速に折りたたまれます (10°Cで半減期5ms).
- 中間物質は,移行状態に到達する前に,部分的に展開する必要があるかもしれません.
- FRBの折りたたみ動態は,全ヘリカルタンパク質の折りたたみメカニズムについての洞察を提供します.
関連する概念動画
Protein Folding
Overview
Protein Folding
Overview
Mechanical Protein Functions
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...
Protein Folding
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Molecular Chaperones and Protein Folding
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...

