タンパク質の折りたたみにより,二硫化物の形成が促進されます.
Pallav Kosuri1, Jorge Alegre-Cebollada2, Jason Feng2
1Graduate Program in Biochemistry & Molecular Biophysics, Columbia University, New York, NY 10027, USA; Department of Biological Sciences, Columbia University, New York, NY 10027, USA.
Cell
|November 13, 2012
まとめ
タンパク質二硫化イソメラーゼ (PDI) は,タンパク質の折り畳みを促進する. 新しい方法により,PDIは折り畳み遅れたネイティブ二硫化物結合を好み,誤折り畳みを防止し,コトランスレーションによる酸化折り畳みを可能にすることが明らかになった.
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.
- タンパク質の折りたたみ
背景:
- タンパク質二硫化異体酵素 (PDI) は,二硫化結合を含むタンパク質の酸化折り畳みに不可欠です.
- PDIがネイティブタンパク質の酸化を達成する正確な反応配列は,まだ完全に理解されていません.
研究 の 目的:
- ディスルファイド結合形成とタンパク質の折り畳みを同時に測定するための新しい技術を開発する.
- 酸化折り畳み経路におけるPDIの役割を明らかにし,誤折り畳みを防ぐメカニズムを特定する.
主な方法:
- ディスルファイド形成とタンパク質折り畳み運動の独立した定量化を可能にする技術の開発.
- 酸化折り畳み経路の初期および後期段階の分析.
主要な成果:
- 非原生ジスルファイド結合は折り畳みプロセスの初期に形成され,タンパク質の誤折りにつながります.
- 特定の PDI ドメインは,折り畳みの後期段階でネイティブ ディスルファイド結合の形成を促進します.
- コトランスレーションによる酸化折り畳みモデルが提案されており,PDIは基板折り畳み時に放出された一時的因子として作用する.
結論:
- PDIの機能は段階特異であり,タンパク質の正しい構造を確保するために,折り畳みの遅い段階でネイティブ・ディスルファイド結合を好みます.
- 提案されたコトランスレーション性酸化折り畳み機構は,さまざまなタンパク質基板におけるPDIの活性に対する一般的な説明を提供します.
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