相关实验视频
Updated: Jun 28, 2025
14:57
Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
9.5K
Gcn4p的差异稳定性控制了其在分化酵母菌群中的细胞特异活性
Libuše Váchová1, Vítězslav Plocek2, Jana Maršíková2
1Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prague, Czech Republic.
mBio
|April 16, 2024
概括
酵母转录因子Gcn4p在殖民地中显示细胞特异性活性,由蛋白质体降解调节,而不是翻译. 这与液体培养不同,并突出了微生物群落中的新型空间调节.
科学领域:
- 微生物学和分子生物学
- 细胞和发育生物学
背景情况:
- Gcn4p是一个保存的AP-1转录因子,调节细胞过程,如应激反应和酵母和哺乳动物的营养可用性.
- 在液态培养中,Gcn4p活性主要通过通过Gcn2p激酶的转化调节来控制,以响应氨基酸的可用性.
- 微生物群落通常存在于结构化,差异化的群体中,但这些环境中的Gcn4p调节不清楚.
研究的目的:
- 研究转录因子Gcn4p在空间结构化的酵母菌群中的调节和活性.
- 为了确定已知的转化调节机制是否控制Gcn4p在差异化的殖民地亚群中.
- 确定在酵母菌群中的不同细胞类型中控制Gcn4p功能的新机制.
主要方法:
- 利用现场显微镜观察Gcn4p在分化酵母菌群中的活性.
- 分析了突变菌株和表达GFP标记Gcn4p的菌株,以评估翻译调节.
- 采用遗传,生化和显微方法来确定关键的调节机制.
主要成果:
- 发现Gcn4p活动是空间调节的,在上层 (U) 细胞中活跃,在殖民地下层 (L) 细胞中不活跃.
- 这种细胞特异性活动独立于Gcn2p或其他已知的翻译/转录调节通路.
- 蛋白质体降解被确定为使U和L细胞之间的Gcn4p功能多样化的主要机制.
- 具有氨基酸的U细胞中的活性Gcn4p及其降解在饥饿的L细胞中代表了一种新的调节策略.
结论:
- 细胞特异性蛋白质体降解,而不是转化控制,是差异化酵母殖民地Gcn4p活性的关键调节者.
- 这种空间调节机制与非结构化液体培养中的Gcn4p调节有很大不同.
- 这些发现揭示了细胞类型特异性蛋白酶体依赖性降解和并行哺乳动物AP-1ATF4调节的新生物学作用.
相关概念视频
01:28Yeast Signaling
14.6K
Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
14.6K
02:36Cells Coordinate Growth and Proliferation
4.5K
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
4.5K
02:34Inhibition of Cdk Activity
4.7K
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...
4.7K
01:28The Cell Cycle Control System
2.9K
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...
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and...
2.9K