プロテアソマルアテパースのヘクサメリクアセンブリは,それらのC端末を通してテンプレートされます
Soyeon Park1, Jeroen Roelofs, Woong Kim
1Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.
Nature
|May 5, 2009
まとめ
研究者らは,プロテアソーム組立におけるRptタンパク質の新たな役割を発見した. 残留物を削除すると,ATPaseのリングアセンブリは,核粒子によってテンプレートされ,核形成複合体が含まれていることが明らかになった.
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
- バイオケミストリー バイオケミストリー
背景:
- プロテアソームは,タンパク質の分解に不可欠な細胞機構である.
- その調節粒子 (RP) は,基板を認識し,展開し,分解のためにコア粒子 (CP) に転位させます.
- ヘテロ・ヘクサメリク ATPase リング (Rpt1-6) は,RPのベースの中心であり,CPと相互作用します.
研究 の 目的:
- プロテアソームバイオゲネシスにおけるRptタンパク質の機能を調査する.
- プロテアゾームの塩基組成のメカニズムを解明する.
主な方法:
- Saccharomyces cerevisiaeの遺伝子操作,特にRptタンパク質のC端末残留物を削除する.
- 組み立て中間製品の識別と特徴付け.
主要な成果:
- タンパク質塩基の組み立ては,コア粒子にテンプレートされています.
- Rpn1,3Rpts,Hsm3を含む中間複合体 (BP1) が特定されました.
- 組み立てに不可欠なRpt4とRpt6は,BP1から欠落しており,核複合体を形成することを示唆しています.
結論:
- Rptタンパク質は,前までは認識されなかった,プロテアソームの生体生成における役割を担っています.
- タンパク質塩基の組み立ては,核形成のRpt4/Rpt6複合体によって開始されるオーケストラ化されたプロセスであり,その後にBP1.1のような他の構成要素の追加が続きます.
関連する概念動画
The Proteasome Structure
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The proteasome is an...
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The 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...
The 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...
The 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...
Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...


