関連する実験動画
Updated: Jul 14, 2026
12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
サイクリンA-タンパク質キナーゼ複合体は配列特異的なDNA結合活性を有する:p33cdk2はE2F-サイクリンA複合体の構成要素である
S H Devoto1, M Mudryj, J Pines
1Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710.
Cell
|January 10, 1992
まとめ
E2F転写因子は,サイクリンA,p107,cdk2キナーゼと複合体を形成する. この複合体はDNA結合とキナーゼ活性を示し,E2FFを示唆しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- E2F転写因子は,サイクリンAと結合することが知られている.
- サイクリンAは,Rb関連のp107およびcdc2関連のp33cdk2キナーゼにも含まれています.
- E2F-サイクリンA複合体はS相中に蓄積され,細胞サイクル制御における役割を暗示する.
研究 の 目的:
- E2F-サイクリンA複合体の組成を調べる.
- 特定された複合体の酵素活性を決定する.
- E2F,サイクリンA,cdk2キナーゼの機能的関係を解明する.
主な方法:
- E2F-サイクリンA複合体の分析.
- タンパク質とタンパク質の相互作用を検出するための生化学的測定法.
- キナーゼ活性アッセイ (例えば,H1キナーゼ活性).
主要な成果:
- E2F-サイクリンA複合体は,p107タンパク質とcdc2に関連したp33cdk2キナーゼの両方を含んでいます.
- 特定された複合体は,H1キナーゼ活性を示す.
- 配列特異的なDNA結合活性を持つサイクリンA-cdk2キナーゼ複合体が定義された.
結論:
- この研究では,DNA結合能力を持つ新しいサイクリンA-cdk2キナーゼ複合体を定義しています.
- この発見は,cdk2キナーゼがDNA結合基板をリン酸化することができると示唆しています.
- E2Fは,このタンパク質キナーゼを特定のDNA部位に局所化する機能を持つかもしれません.
関連する概念動画
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
01:23Negative Regulator Molecules
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.
02:36DNA Damage can Stall the Cell Cycle
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...
02:39Positive Regulator Molecules
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
02:34Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
02:36DNA Damage Can Stall the Cell Cycle
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...