相关实验视频
Updated: May 8, 2026
12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
增长促进转录因子E2F-1的负调节由稳定结合的环林A依赖蛋白激酶
W Krek1, M E Ewen, S Shirodkar
1Dana-Farber Cancer Institute, Boston, Massachusetts 02115.
Cell
|July 15, 1994
概括
环林A-激酶在S/G2阶段抑制E2F-1DNA结合. 这种依赖细胞周期的相互作用有助于调节细胞周期进展的基因表达.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 环林A-激酶对于协调S阶段进展至关重要.
- E2F-1是一种促进生长的转录因子,它结合了视网膜母细胞瘤基因产物 (RB).
- E2F-1调节了G1退出和S阶段穿越所必需的基因.
研究的目的:
- 调查环林A-激酶和E2F-1之间的相互作用.
- 了解这种复杂的形成对E2F-1活动的功能后果.
- 阐明这些相互作用在细胞周期依赖基因表达中的作用.
主要方法:
- 在体内复杂形成的研究.
- 生物化学测试以评估DNA结合功能.
- 细胞周期分析.
主要成果:
- 环林A-激酶在体内与E2F-1形成稳定的复合体.
- 复杂的形成导致在S/G2阶段关闭E2F-1-依赖DNA结合.
- 这种抑制是环林A-激酶的负面生化作用.
结论:
- 细胞周期依赖的E2F-1与抑制蛋白的相互作用 (G1中的RB,S/G2中的环林A-激酶) 是至关重要的.
- 这些相互作用有助于精确定时E2F-1-响应基因表达.
- 循环林A-激酶对E2F-1活动的调节影响了G1/S过渡.
相关概念视频
01:45Positive Regulator Molecules
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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.
02:39Positive 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...
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Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...