细胞循环控制中的一个新的调节动机导致了环林D/CDK4的特定抑制
M Serrano1, G J Hannon, D Beach
1Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, New York 11724.
Nature
|December 16, 1993
概括
一种新发现的蛋白质,p16,与循环素依赖性激酶4 (CDK4) 结合并抑制其活性. 这一发现揭示了一个新的调控反电路,控制细胞分裂和增殖.
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:
- 细胞细胞分裂是由循环素依赖激酶 (CDKs) 调节的.
- 在G1阶段,CDK4和D型环林控制细胞增殖.
- CDK4与循环素,增殖细胞核抗原和p21形成复合体.
研究的目的:
- 为了分离和描述人类的p16蛋白质.
- 研究p16和CDK4.4之间的相互作用.
- 为了确定p16对CDK4/cyclin D酶活性的影响.
主要方法:
- 人类p16互补DNA的分离.
- 生物化学试验用于研究蛋白质结合和酶抑制.
主要成果:
- 人类p16cDNA被成功分离出来.
- 已经证明p16与CDK4结合.
- p16 抑制了CDK4/cyclin D酶的催化活性.
结论:
- p16作为CDK4/cyclin D活性的一种抑制剂.
- p16参与了与CDK4,D型环林和视网膜母细胞瘤蛋白的调节反电路.
- 这种相互作用在缺乏功能性视网膜母细胞瘤蛋白的细胞中尤为重要.
相关概念视频
Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
Negative 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.
Positive 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.
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...
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...
The Cell Cycle Control System
The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...


