プロテアソームレギュレータPA28によって誘発される協調された二重分裂は,支配的なMHCリガンドにつながります
T P Dick1, T Ruppert, M Groettrup
1Department of Tumorvirus-Immunology, German Cancer Research Center, Heidelberg, Federal Republic of Germany.
Cell
|July 26, 1996
まとめ
プロテアソーム調節体PA28は,プロテアソームを強化する.
科学分野:
- * 分子生物学について
- * 免疫学について
- * バイオケミストリー
背景:
- * ユカリオット20Sプロテアゾームは,複数のサブユニットを持つプロテアゼ複合体である.
- * プロテアゾームは,抗原の表示とタンパク質の分解に関与する.
- *PA28 (プロテアソーム活性化剤28) は,20Sプロテアソームと結合するインターフェロン・ガンマ誘導性調節剤です.
研究 の 目的:
- *20Sプロテアソームによる産物生成の動力学に対するPA28の影響を調査する.
- *PA28がタンパク質分裂パターンを変化させるメカニズムを解明する.
- * PA28がT細胞エピトープの生成を最適化するかどうかを判断する.
主な方法:
- *PA28.28,PA28.28,PA28.22,PA28.23,PA28.23,PA28.24,PA28.25,PA28.26,PA28.27,PA28.26,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28.27,PA28,PA28.27,PA28,PA28,PA28,PA27,PA28,PA27,PA27,PA28,PA27,PA27,PA27,PA27,PA27,PA2
- *特定のタンパク質基板 (マウスサイトメガロウイルスpp89およびJAK1キナーゼ) から生成されたペプチド産物の分析.
主要な成果:
- * PA28 が存在しない場合,20S プロテアソームは主に単一分裂ペプチドを生成する.
- * PA28は,調整された二重割れメカニズムを促進し,二重割れ製品の即時生成につながります.
- *PA28はメジャー・ヒストコンパティビリティ・コンプレックス (MHC) リガンドとその前駆者の生成を大幅に強化します.
結論:
- *PA28は,20Sプロテアゾームの分裂機構を深刻に変化させます.
- *PA28は,MHCリガンド前駆体生成を強化することによって,支配的なT細胞エピトープの生成を最適化します.
- * これは,PA28が適応免疫と抗原プレゼンテーションにおいて重要な役割を果たしていることを示唆しています.
さらに関連する動画
関連する概念動画
The Proteasome
7.8K
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...
7.8K
Separation of Sister Chromatids
3.6K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
3.6K
Anaphase Promoting Complex
2.5K
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
2.5K
The Proteasome
1.6K
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...
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...
1.6K
Antigens Involved in Adaptive Immunity
1.8K
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...
Complete Antigens
Complete antigens possess both immunogenicity and...
1.8K
Antigen Processing Pathways
2.9K
MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
MHC Class I: Presenting Endogenous...
2.9K


