関連する実験動画
Updated: Apr 8, 2026
07:43
Assaying Proteasomal Degradation in a Cell-free System in Plants
Published on: March 27, 2014
15.2K
カリン依存性分解による体系系からの生殖プラズマタンパク質の排除
Cynthia DeRenzo1, Kimberly J Reese, Geraldine Seydoux
1Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Nature
|August 2, 2003
まとめ
ゲルムラインの確立には,特殊なサイトプラズマが必要です. この研究は,ZIF-1とクリン-2ユビキチンリガゼ複合体によって媒介される体細胞における生殖細胞タンパク質の分解が,Caenorhabditis elegansにおける生殖細胞プラズマ非対称性にとって重要であることを示しています.
科学分野:
- 発達生物学 発達生物学について
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- 多くの動物の生殖系統の確立は,生殖プラズマを前体細胞に分離することに依存しています.
- ゲルムプラズマ非対称性とは,胚形成の初期にRNAとタンパク質を正確に標的にすることを意味します.
研究 の 目的:
- 胚性プラズマ非対称性におけるタンパク質分解の役割を調査する.
- 体細胞における生殖線タンパク質の安定性を調節する分子機構を特定する.
主な方法:
- Caenorhabditis elegansにおけるCCCH指タンパク質とZIF-1の機能を調査した.
- タンパク質分解に必要なウビキチンリガゼ複合体の成分を特定するために遺伝分析を利用した.
- MEX-5,MEX-6,PAR-1キナーゼの分解経路の調節における役割を調べました.
主要な成果:
- 胚性プラズマに不可欠な5つのCCCH指タンパク質は,ZIF-1によって分解される.
- ZIF-1は,エルロギンC,CUL-2,RBX-1,UBC5と機能し,E3ユビキチンリガゼ複合体を形成する.
- MEX-5とMEX-6は体細胞の分解を活性化しますが,PAR-1キナーゼは生殖系でそれを抑制します.
結論:
- 胚性プラズマの非対称性は,胚性タンパク質の安定化と体性分解の両方に依存しています.
- キュリン2ベースのユビキチンリガゼ複合体は,体細胞における生殖細胞タンパク質の分解を媒介する.
- ZIF-1とPAR-1によるタンパク質の安定性の微分調節は,生殖系統の完全性を保証する.
関連する概念動画
01:23Negative Regulator Molecules
39.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
39.1K
02:36DNA Damage can Stall the Cell Cycle
10.4K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
10.4K
02:31Nuclear Export of mRNA
9.3K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
9.3K
02:58Regulated Protein Degradation
9.3K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
9.3K
00:50Anaphase Promoting Complex
3.5K
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...
3.5K
02:36DNA Damage Can Stall the Cell Cycle
3.4K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
3.4K