通过双氨酸与Cdt1结合来抑制真核细胞DNA复制
J A Wohlschlegel1, B T Dwyer, S K Dhar
1Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
Science (New York, N.Y.)
|December 23, 2000
概括
双子素是一种防止DNA重复制的蛋白质,通过与CDT1结合而起作用,这是DNA复制启动的关键因素. 这种相互作用通过抑制不适当的原始点火,确保了适当的细胞循环调节.
科学领域:
- 分子生物学分子生物学
- 细胞循环规则 细胞循环规则
- 复制DNA复制DNA复制DNA复制
背景情况:
- 细胞细胞循环的进展受到严格管制,以防止DNA重复复制.
- 循环素依赖性激酶在G2阶段抑制不适当的原始激发.
- 双子素是多细胞真核生物中已知的重复复制抑制剂,但其机制尚未完全理解.
研究的目的:
- 阐明双子素抑制DNA复制的机制.
- 为了确定参与复制控制的双子座的相互作用伙伴.
主要方法:
- 使用生物化学测试研究了双子素和Cdt1之间的相互作用.
- 利用无细胞DNA复制提取物来评估双子素-Cdt1相互作用的功能影响.
- 分析了Cdt1和双子素在正常细胞周期中的表达模式.
主要成果:
- 证明双子素和Cdt1,一个复制启动因子之间的直接和紧密的相互作用.
- 显示过多的Cdt1可以逆转双子素介导的DNA复制抑制在体外.
- 与细胞周期的 G1 和 S 阶段相关联了 Cdt1 的存在,与细胞周期的 S 和 G2 阶段相关联了双子素.
结论:
- 双子座通过直接准Cdt1.1来抑制DNA重复复制.
- 时间调节Cdt1和双子素水平有助于防止不适当的原始点火.
- 这项研究阐明了细胞周期控制的关键机制,防止基因组不稳定.
更多相关视频
08:33Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
Published on: December 5, 2017
09:56Epigenetic Engineering of K562 Cells: Dual-Vector Episomal Strategy for Stable Targeted DNA Methylation using dCas9-DNMT3A and -HDAC1 Fusion Proteins
Published on: October 31, 2025
相关概念视频
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...
02:34Inhibition 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...
02:38S-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.