艰难 Clostridioides 殖民地形态的相变通过细胞分裂的调节发生
Anchal Mehra1, Elizabeth M Garrett2, Christopher J Serody3
1Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America.
PLoS pathogens
|December 1, 2025
概括
艰难菌的阶段变化涉及CmrRST系统,调节殖民地形态和运动. CmrT调节器控制mrpA和mrpB基因,这些基因影响细胞分裂和表面扩张.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 细胞生物学 细胞生物学
背景情况:
- 困难杆菌表现出影响殖民地形态和毒性的相变.
- cmrRST操作子编码了一个由三种蛋白质组成的信号传导系统来调节这些变化.
- CmrR和CmrT反应调节器影响殖民地发育,细胞形状,运动性和疾病.
研究的目的:
- 为了阐明与C. difficile殖民地形态相变相相变相关的转录变化.
- 确定CmrR和CmrT在调节基因表达中的特定作用.
- 描述新型CmrT调节基因mrpA和mrpB的功能.
主要方法:
- RNA测序 (RNA-Seq) 用于比较粗和光滑殖民地的转录形状.
- 对C. difficile菌株进行基因操纵,以评估基因功能.
- 免疫沉和质谱测量以确定蛋白质-蛋白质相互作用.
主要成果:
- CmrT,而不是CmrR,主要负责相变的基因表达差异.
- 确定了两种CmrT调节基因,mrpA和mrpB,并表明它们可以在cmrT突变体中恢复CmrT依赖的表型.
- MrpA与细胞分裂蛋白MinD相互作用,而mrpAB的宫外表达导致非典型的细胞分裂.
结论:
- 通过CmrT介导的mrpAB表达干扰细胞分裂,导致细胞延长和变化的运动性.
- 这种机制解释了C. difficile如何在相变化期间调节殖民地形态和表面运动.
- CmrRST系统及其下游效应器,如MrpAB,对于C. difficile的适应和发病是至关重要的.
相关概念视频
01:27Molecular Factors Affecting Cell Division
3.8K
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
3.8K
02:13Determining the Plane of Cell Division
3.8K
Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function.
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division...
Animal cells
In animal cells, the cleavage furrow forms along the plane of cell division...
3.8K
02:36Cells Coordinate Growth and Proliferation
5.0K
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,...
5.0K