一个CDK抑制剂的多站点酸化为DNA复制的开始设定了一个值
1Programme in Molecular Biology and Cancer, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto M5G 1X5, Canada.
Nature
|December 6, 2001
概括
像Cdc4这样的SCF泛基素连接酶,准酸化蛋白质进行降解. 这一过程涉及F盒蛋白和酸化值,确保了细胞周期的适当时间,例如DNA复制的G1阶段.
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:
- 通过F-盒蛋白适配器,SCF泛基因酶调解蛋白质降解.
- F盒蛋白Cdc4针对Sic1,一个依赖于环林的激酶抑制剂,在G1阶段进行降解.
- 这种降解对于启动DNA复制和细胞周期进展至关重要.
研究的目的:
- 研究Cdc4与其基质Sic1.1结合的机制.
- 了解酸化部位如何调节Sic1降解的时间.
- 探索亚最佳结合基因在确定细胞周期值中的作用.
主要方法:
- 分析Cdc4和Sic1.1之间的蛋白质与蛋白质相互作用.
- 对Cdc4酸降解 (CPD) 基因的表征.
- 在体内研究以评估酸化位突变对Sic1降解和细胞周期进展的影响.
主要成果:
- Cdc4通过其WD40重复域与化Sic1结合,识别了CPD动机.
- Sic1 具有多个低于最佳的 CPD 动机,这些动机共同调解 Cdc4 结合.
- 这些薄弱的结合点产生了依赖酸化的值,延迟了Sic1的降解,并确保了最小的G1相持续时间.
结论:
- 多位酸化和低于最佳的结合动机是建立蛋白质-蛋白质相互作用的监管值的一般机制.
- 这种机制确保精确控制细胞周期事件,例如DNA复制的时间.
- 这些发现提供了对蛋白质循环和细胞循环控制的调节的见解.
相关概念视频
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...
02:34Inhibition 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...
02:38S-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.
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...
02:34Inhibition 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...
02:38S-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.