大肠杆菌核体组织和活细胞中的动态的四维成像
Jay K Fisher1, Aude Bourniquel, Guillaume Witz
1Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.
Cell
|April 30, 2013
概括
活生生的大肠杆菌核素形成了一个动态的螺旋形状,由密度波和脉冲分离驱动. 这表明一种基于染色体的引擎控制细菌细胞分裂和核状组织.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 细菌核体,包括DNA和蛋白质,在细胞内高度组织.
- 了解核体结构和动态对于细菌细胞的分裂和功能至关重要.
研究的目的:
- 为了可视化和描述活体大肠杆菌*核子体的动态结构.
- 阐明控制核体形状,内部动力学和分离的机制.
主要方法:
- 使用HupA-mCherry光学对大肠杆菌核体的活细胞成像.
- 分析核密度分布,形状和随时间的动态变化.
主要成果:
- *大肠杆菌*核体呈现出一个离散的,动态的螺旋圆形结构.
- 核状密度凝聚成纵向束,在细胞内被辐射限制.
- 纵向密度波和脉冲,端到端的姐妹分离驱动核体动力学和细胞周期进展.
结论:
- 细菌核体具有复杂,动态的螺旋组织.
- 基于染色体的机械应力和编程的带可能调节核形态发生和分离.
- 这些发现提出了一个基于染色体的发动机模型,用于细菌细胞循环的进展.
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