核体结构和动力学影响Bacillus subtilis中的自然染色体转换:EbfC的作用
Rubén Torres1, María López-Sanz1, Yuri Ushijima2
1Department of Microbial Biotechnology, Centro Nacional de Biotecnología (CNB), CSIC, 3 Darwin St, Madrid 28049, Spain.
Nucleic acids research
|October 21, 2025
概括
像EBfC这样的核蛋白相关蛋白质 (NAP) 影响细菌DNA过程. EbfC在自然转化中反对其他NAP,但在DNA修复中合作,突出显示染色体折叠.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 在 Bacillus subtilis 中,自然染色体转化 (NCT) 是一个复杂的过程,依赖于 RecA 和辅助蛋白质.
- 核素相关蛋白 (NAP) 显著影响细菌基因组的组织和功能.
- 以前的研究表明,某些NAP (Hbsu,Rok,LrpC) 对NCT具有双重影响.
研究的目的:
- 研究NAP EbfC在Bacillus subtilis自然染色体转换 (NCT) 和DNA修复中的作用.
- 阐明EBfC与其他NAP (Hbsu,Rok,LrpC) 在调节这些过程中的相互作用.
主要方法:
- 在NAP基因 (ebfC,hbsu,rok,lrpC,recX,recD2) 中存在各种突变的Bacillus subtilis菌株中分析NCT效率.
- 纯化EbfC的DNA结合和DNA桥接活动的特征.
- 显微镜测定不同突变菌株的核状缩.
主要成果:
- EbfC的功能是NAP,结合ssDNA和dsDNA,并促进DNA的紧缩.
- EbfC的非激活会减少NCT,而其过度表达会增强NCT;相反,Hbsu,Rok和LrpC会增强NCT.
- 在hbsu,rok或lrpC中的突变抑制了recD2突变体中的ebfC介导NCT缺陷和DNA修复缺陷.
结论:
- 由NAPs调节的染色体折叠对于NCT和DNA修复都至关重要.
- 在NCT中,EbfC与Hbsu,Rok和LrpC扮演着对立的角色,但它们在DNA修复途径中合作.
- 国家基因组组的相互关联功能凸显了它们在维持基因组稳定性和促进基因交换方面的重要性.
更多相关视频
相关概念视频
Bacterial Transformation
59.3K
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
59.3K
Transformation
693
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
693
Nucleoid
828
The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
828
Cytoskeletal Proteins in Bacteria
4.1K
Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
4.1K
Transduction
1.2K
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
1.2K
Mechanism of Conjugation
810
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
810


