相关实验视频
Updated: Jul 14, 2026
12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
一个环林A-蛋白激酶复合物具有特定序列的DNA结合活性:p33cdk2是E2F-环林A复合物的组成部分
S H Devoto1, M Mudryj, J Pines
1Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710.
Cell
|January 10, 1992
概括
E2F转录因子与环林A,p107和cdk2激酶形成一个复合体. 这种复合物表现出DNA结合和激酶活性,表明E2FF.
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:
- 已知E2F转录因子与环林A结合.
- 环素A也被发现与Rb相关的p107和cdc2相关的p33cdk2激酶.
- 在S阶段,E2F-环林A复合物会积累,这意味着它在细胞循环控制中的作用.
研究的目的:
- 为了研究E2F-环素A复合物的组成.
- 为了确定所识别的复合物的酶活性.
- 为了阐明E2F,环林A和cdk2激酶之间的功能关系.
主要方法:
- 对E2F-环林A复合物的分析.
- 生物化学分析检测蛋白质与蛋白质相互作用.
- 激酶活性测定 (例如,H1激酶活性).
主要成果:
- 该E2F-环林A复合体含有p107蛋白和与cdc2相关的p33cdk2激酶.
- 鉴定到的复合物表现出H1激酶活性.
- 定义了一个具有特定序列DNA结合活性的环林A-cdk2激酶复合体.
结论:
- 该研究定义了一种具有DNA结合能力的新型cyclin A-cdk2激酶复合体.
- 这些发现表明cdk2激酶可以酸化与DNA结合的基质.
- E2F的功能可能是将这种蛋白激酶定位到特定的DNA位点.
相关概念视频
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...