在Staphylococcus aureus的细胞周期期间染色体分离的动态
Adrian Izquierdo-Martinez1, Simon Schäper1, António D Brito1
1Instituto de Tecnologia Química e Biológica António Xavier, Universidade NOVA de Lisboa, Oeiras, Portugal.
Nature communications
|September 29, 2025
概括
黄金葡萄球菌的细胞周期和染色体复制是非同步的. 像SMC-ScpAB这样的关键蛋白质对于这种球形细菌的染色体分离和组织至关重要.
科学领域:
- 微生物学 微生物学
- 细菌细胞生物学 细菌细胞生物学
- 分子遗传学 分子遗传学
背景情况:
- 对染色体组织和细胞循环进展的有限理解在球状细菌中,如金黄色葡萄球菌.
- 需要先进的模型来研究细菌染色体动力学.
研究的目的:
- 建立一个模型来研究S. aureus.的染色体动态.
- 阐明细胞周期和染色体复制之间的同步.
- 确定特定蛋白质在S. aureus染色体组织和分离中的作用.
主要方法:
- 使用光抑制操作系统 (FROS) 精确定位S. aureus的染色体位置.
- 评估了ParB-parS和SMC-ScpAB系统对染色体组织的影响.
- 评估了Noc,FtsK,SpoIIIE和XerC在将染色体分离与细胞分裂之间的作用.
主要成果:
- 黄金色球菌的细胞周期和染色体复制不是同步的,在细胞周期开始时存在两种复制起源.
- 染色体表现出一个起源-终点-起源形状,其起源在细胞极点.
- SMC-ScpAB复合体对于染色体分离和空间组织至关重要,而ParB则起到较小的作用.
- 蛋白质Noc,FtsK,SpoIIIE和XerC影响起源和终端位置.
结论:
- 为研究S. aureus.中的细菌染色体动态提供了一个全面的模型.
- 突出了S. aureus.细胞分裂和DNA复制的异步性质.
- 定义了SMC-ScpAB和其他蛋白质在细菌染色体管理中的关键作用.
相关概念视频
02:17Separation of Sister Chromatids
4.4K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
4.4K
02:20Cohesins
5.5K
Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...
5.5K
02:15Condensins
4.5K
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
4.5K
02:02Meiosis II
49.0K
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
49.0K
01:39Anaphase A and B
5.3K
Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
5.3K
02:03Mitosis and Cytokinesis
279.3K
In eukaryotes, the cell division cycle is divided into distinct, coordinated cellular processes that include cell growth, DNA replication/chromosome duplication, chromosome distribution to daughter cells, and finally, cell division. The cell cycle is tightly regulated by its regulatory systems as well as extracellular signals that affect cell proliferation.
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
The processes of the cell cycle occur over approximately 24 hours (in typical human cells) and in two major distinguishable stages. The...
279.3K