负反使多芽酵母的极性位点均.
Alex W Crocker1, Claudia A Petrucco2, Kaiyun Guan3
1Curriculum in Bioinformatics and Computational Biology, University of North Carolina at Chapel Hill, 120 Mason Farm Rd., Chapel Hill, NC 27599, USA; Duke University, Department of Cell Biology, 308 Research Drive, Durham, NC 27705, USA.
Current biology : CB
|June 7, 2025
概括
Aureobasidium pullulans酵母通过独立调节细胞极性位点,形成多个芽. 这与单芽酵母形成鲜明对比,并揭示了保存的信号网络如何创造多样化的真菌形态发生.
科学领域:
- 细胞生物学 细胞生物学
- 菌类学 菌类学是指菌类学.
- 发展生物学 发展生物学
背景情况:
- 和动物形态发生依赖于小GTPases,如Cdc42和Rac,用于细胞两极分化.
- 发芽酵母Saccharomyces cerevisiae由于两极点之间的竞争,通常形成一个单一的芽.
研究的目的:
- 研究Aureobasidium pullulans细胞极性和多个芽的机制.
- 了解保护信号网络是如何为不同的形态生成程序调制的.
主要方法:
- 观察共存的极性点和极性机械部件的独立振荡.
- 确定Pak1作为一个关键蛋白质,在极性电路中调节负反.
- 评估Rac1和Cdc42对于Pak1定位的要求.
主要成果:
- Aureobasidium pullulans建立了多个共存的极性位点,导致每个细胞周期中的多个芽.
- 极性成分在各位点之间独立振荡,表明缺乏全球合.
- 对多极点和振荡至关重要的负反取决于Pak1,它需要Rac1,但不需要Cdc42.
结论:
- 保存的细胞极性信号网络可以适应不同的形态生成结果,例如真菌中的多个芽.
- 帕克1介导的负反对于Aureobasidium pullulans中观察到的独特的芽模式至关重要.
- 极性位点的独立调节允许在保存的分子框架内进行复杂的发育程序.
相关概念视频
01:28Yeast Signaling
15.8K
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...
15.8K
01:07Cell Signaling Feedback Loops
6.6K
Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
Negative feedback loops
Most signaling systems have negative feedback loops that can perform different functions such as output limiter, and adaptation.
Output limiter
Upon receiving an input signal, the cellular response rapidly increases until a threshold is reached. Beyond this threshold, a negative feedback loop...
6.6K
01:18Positive and Negative Feedback Loops
20.2K
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:
20.2K
01:23Root Loci for Positive-Feedback Systems
163
The Hartley oscillator is a positive feedback system that sustains oscillations by feeding the output back to the input in phase, thereby reinforcing the signal. Positive feedback systems can be viewed as negative feedback systems with inverted feedback signals. In these systems, the root locus encompasses all points on the s-plane where the angle of the system transfer function equals 360 degrees.
The construction rules for the root locus in positive feedback systems are similar to those in...
The construction rules for the root locus in positive feedback systems are similar to those in...
163
02:50Dosage Compensation
6.3K
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
6.3K
02:36Cells Coordinate Growth and Proliferation
4.6K
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,...
4.6K