Cdc48•20Sプロテアソームを古代AAA+プロテオリシスマシンとして特定した
Dominik Barthelme1, Robert T Sauer
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|July 28, 2012
まとめ
Thermoplasma acidophilumのCdc48タンパク質と20Sプロテアソームは,機能的なプロテアソームを形成することができる. これは,タンパク質の分解がCdc48ファミリーの古代の役割である可能性を示唆しています.
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:
- プロテアソームは,真核生物と古生物における重要なタンパク質分解装置である.
- 20Sコアペプチダゼは,タンパク質の分解を制御する粒子で機能する.
- AAA+タンパク質Cdc48の機能は,古生物と真核生物において依然として大きく不確実である.
研究 の 目的:
- アーケオンThermoplasma acidophilumにおけるCdc48と20Sプロテアソームの相互作用を調査する.
- Cdc48と20Sが機能するプロテアソームを形成できるかどうかを判断する.
主な方法:
- Cdc48と20Sの相互作用と機能をテストするための生化学的測定法.
- 複合体の構造分析. 複合体の構造分析.
主要な成果:
- Thermoplasma acidophilumのCdc48と20Sは相互作用することが判明しました.
- この相互作用により,タンパク質の分解を可能にする機能的なプロテアソームが形成されます.
- Cdc48は,この古代のプロテアゾームの重要な構成要素です.
結論:
- タンパク質分解は,20Sペプチダゼと併用して,Cdc48ファミリーの祖先の機能である可能性があります.
- この発見は,プロテアソーム機構の進化に光を当てています.
- 古代のタンパク質の分解におけるCdc48の役割は明らかになった.
関連する概念動画
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01:13The Proteasome
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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...
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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...
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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...
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