多領域タンパク質のほぼ連続したコトランスレーションによる圧縮と折りたたみ
bioRxiv : the preprint server for biology
|February 12, 2026
まとめ
この研究は,Firefly luciferaseのような複雑なタンパク質の詳細なコトランスレーションの折り畳みを明らかにしています. フォースプロファイルの分析は,単純な移行ではなく,中間力や特定のドメインの折りたたみを含む複雑なプロセスを示します.
科学分野:
- バイオケミストリーと分子生物学
- タンパク質の折り畳みダイナミクス
- 構造生物学 構造生物学とは
背景:
- ほとんどのタンパク質の折り畳みは,タンパク質がリボソームから発生するにつれて,コトランスレーション的に起こります.
- 以前の研究は,主に小さな単一ドメインのタンパク質に焦点を当てていた.
- 複雑なタンパク質のコトランスレーション的折り畳みを理解することは,依然として課題です.
研究 の 目的:
- 複合タンパク質ファイヤーフライルシフェラーゼのコトランスレーションによる折り畳み過程を調査する.
- 折りたたみに関与する機械力および中間状態を特徴付ける.
- 新生複合タンパク質の折りたたみにおけるトリガーファクターの役割を調査する.
主な方法:
- フォースプロファイル分析 (FPA) を利用して,折り畳みを監視した.
- FireflyのルシフェラーゼにFPAを適用した.これは大型で多領域のタンパク質である.
- 合成中に新生鎖の引力力を分析した.
主要な成果:
- 詳細な,ほぼ連続した一連の圧縮と折り畳みのステップを特定しました.
- 観測された中間の引力力と,明確な低力折り畳み中介物.
- RF-2ドメインの折りたたみに対応する顕著な高力のイベントを特徴づけた.
- Found Trigger Factorは,特定の合成段階において新生鎖と相互作用する.
結論:
- Firefly luciferaseのコトランスレーション的折り畳みは,複雑で詳細なプロセスです.
- これは,いくつかの協力的な折り畳み移行の単純なシーケンスではありません.
- フォースプロファイルの分析は,新生タンパク質の折り畳みダイナミクスに関する深い洞察を提供します.
関連する概念動画
Protein Folding
128.2K
Overview
128.2K
Protein Folding
11.6K
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...
11.6K
Cotranslational Protein Translocation
10.0K
Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...
10.0K
Molecular Chaperones and Protein Folding
19.9K
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...
19.9K
Molecular Chaperones and Protein Folding
15.1K
15.1K
Compact Bone
16.8K
Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
16.8K


