p35是循环林依赖激酶5的神经特异性调节子单元
L H Tsai1, I Delalle, V S Caviness
1Massachusetts General Hospital Cancer Center, Charlestown 02129.
Nature
|September 29, 1994
概括
研究人员确定了p35,一种新型调节子单元,可在脑组织中特别激活循环素依赖激酶5 (Cdk5). 这一发现解释了Cdk5的存在.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 循环素依赖激酶5 (Cdk5) 在结构上与细胞循环调节剂Cdc2相似.
- Cdk5蛋白在大脑和丸中很丰富,但其激酶活性仅在大脑中被检测到.
- 细胞系中Cdk5激酶活性的缺失表明了调控子单元的参与.
研究的目的:
- 确定和描述负责大脑中Cdk5激活的调节子单元.
- 调查这个子单元在神经元Cdk5活动中的作用.
主要方法:
- 一种新型蛋白质的克隆和特征,p35.
- 在不同组织中分析p35表达模式.
- 在p35和Cdk5.5之间的体内关联研究.
- 在p35.5的存在下测定Cdk5激酶活性.
主要成果:
- 确定了一个新的Cdk5监管子单位,称为p35.
- p35表现出神经元细胞特异性的表达.
- 在体内,p35在物理上与Cdk5结合,并强烈激活其激酶活性.
结论:
- p35是一种神经元特异性的Cdk5.5激活剂.
- p35代表了循环林依赖性激酶的新型调节子单元.
- Cdk5/p35复合体对于大脑中的特定功能至关重要.
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...
Anaphase Promoting Complex
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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...


