相关实验视频
Updated: Jul 5, 2026

12:19
Analysis of Cell Cycle Position in Mammalian Cells
Published on: January 21, 2012
视网母细胞瘤蛋白的酸化由具有循环林依赖性激酶功能的病毒蛋白
Adam J Hume1, Jonathan S Finkel, Jeremy P Kamil
1Institute for Molecular Virology and McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, WI 53706, USA.
概括
人类细胞巨乳病毒UL97蛋白通过化关键细胞循环调节剂,模仿细胞循环依赖激酶 (CDKs). 这种病毒蛋白驱动细胞循环的进展,并绕过正常的CDK抑制,帮助病毒复制.
科学领域:
- 病毒学 病毒学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 病毒是有义务的细胞内寄生虫,它们操纵宿主细胞的复制过程.
- 病毒蛋白可以模仿细胞功能,通常缺乏正常的调节特征.
- 人类细胞巨核病毒 (HCMV) 是一个重要的人类病原体.
研究的目的:
- 为了研究HCMV UL97蛋白的酶活性.
- 为了确定UL97是否具有与细胞环林依赖激酶 (CDK) 复合体相似的功能.
- 了解UL97如何与宿主细胞循环调节相互作用.
主要方法:
- 评估UL97对视网膜母细胞瘤瘤抑制剂的酸化活性.
- 评估UL97在哺乳动物细胞中刺激细胞循环进展的能力.
- 测试UL97在缺乏CDK活性的酵母中拯救增殖的能力.
- 分析UL97对保存的CDK残留物和p21的抑制.
主要成果:
- UL97酸化和禁用了视网膜母细胞瘤瘤抑制剂.
- UL97刺激了哺乳动物细胞的细胞循环进展.
- UL97在缺乏CDK活性的Saccharomyces cerevisiae中挽救了增殖.
- UL97没有受到CDK抑制剂p21的抑制,并且缺乏CDK中发现的关键调节残留物.
结论:
- HCMV UL97蛋白质作为病毒循环素依赖激酶 (CDK) 的功能.
- UL97具有CDK类的激酶活性,驱动宿主细胞周期的进展.
- UL97对细胞CDK控制机制具有抗性,包括p21抑制,促进病毒复制.
相关概念视频
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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
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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...
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.

