プロテアソームの調節粒子の完全なサブユニット構造
Gabriel C Lander1, Eric Estrin, Mary E Matyskiela
1Life Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.
Nature
|January 13, 2012
まとめ
プロテアソームは,プロテアソームである.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 構造生物学 構造生物学とは
背景:
- プロテアゾームは,真核細胞のATP依存プロテアゼ複合体である.
- 構造データが限られているため,プロテアソーム機能の完全なメカニズムを理解することは困難です.
- プロテアソーム調節粒子 (RP) は,ポリユビキチン基板の認識と処理を管理する.
研究 の 目的:
- イーストプロテアソームの調節粒子の完全なサブユニット構造を決定する.
- ユビキチン受容体やデウビキチン化酵素を含む主要なRP成分の空間的配置を解明する.
- 基板転移と分解経路に関するメカニズム的な洞察を得るために.
主な方法:
- 高解像度の構造分析のために電子顕微鏡を用いた.
- プロテアソーム蓋子サブコンプレックスのための新しい異質表現システムを開発した.
- 統合された構造データは,サブユニット組織と基板処理経路をマッピングします.
主要な成果:
- イーストプロテアソームの規制粒子の完全なサブユニット構造をサブナノメートルの解像度で描写した.
- 塩基展開酵素におけるATPアゼサブユニットの渦巻き階段の配置を明らかにし,転位機構を示唆した.
- ホロ酵素形成時に蓋の大きな形状の変化が観察され,アロステル調節を示す.
結論:
- プロテアソーム調節粒子の詳細な構造モデルを提供し,基板分解経路を明らかにしました.
- 基板のATP依存の展開と転位に関する構造的洞察を提供した.
- 多様な細胞プロセスのプロテアソーム媒介調節のための構造的基礎を確立した.
関連する概念動画
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Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
01:13The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
02:18The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...