CDKs通过保护Cdc6免受APC/C依赖蛋白解,促进人类细胞中的DNA复制原始授权
Niels Mailand1, John F X Diffley
1Cancer Research UK London Research Institute, Clare Hall Laboratories, Hertfordshire, United Kingdom.
Cell
|September 13, 2005
概括
循环素依赖激酶 (CDK) 通常防止DNA复制许可,但在这里稳定了Cdc6蛋白. 这种稳定允许复制前复合组合,这是细胞分裂前的关键步骤.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 循环素依赖激酶 (CDK) 调节细胞周期,限制DNA复制原始发射每细胞周期一次.
- CDKs防止在G1阶段之外的预复制复合体 (pre-RC) 组装,这一过程称为许可.
- 矛盾的是,某些CDK,如cyclin E-cdk2,也需要促进许可.
研究的目的:
- 调查CDK在监管DNA复制许可证中的双重作用.
- 阐明CDK在特定条件下促进许可的机制.
- 了解基本许可因素Cdc6.6的规定.
主要方法:
- 研究的CDK对Cdc6.6的酸化.
- 评估了Cdc6和亚纳促进复合体/环体 (APC/C) 之间的相互作用.
- 在静止和重新进入细胞中分析了Cdc6蛋白解和RC前组合.
主要成果:
- CDK酸化通过抑制其APC/C介导的降解来稳定Cdc6.
- 以APC/C为依赖的Cdc6蛋白解可以防止在静止细胞中进行RC前组合.
- 通过CDK介导的Cdc6稳定使其在细胞周期重新进入过程中在许可抑制剂 (geminin,cyclin A) 之前积累.
结论:
- 一种新的机制调节了蛋白质的稳定性,为S阶段之前的RC前组装建立了一个关键窗口.
- 这种CDK依赖的Cdc6稳定被认为是环林E的一个关键功能.
- 了解这种调节对于理解细胞周期控制和DNA复制启动至关重要.
相关概念视频
DNA 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...
Inhibition 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...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
DNA 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...
Inhibition 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...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.


