大肠杆菌和细菌中的DNA复制应激反应的标志
Rubén Torres1, Begoña Carrasco1, Silvia Ayora1
1Department of Microbial Biotechnology, Centro Nacional de Biotecnología, CNB-CSIC, 3 Darwin St, 28049 Madrid, Spain.
FEMS microbiology reviews
|August 28, 2025
概括
本综述比较了大肠杆菌和细菌中的DNA复制应激反应,强调了Reca在管理停滞的分叉和确保基因组稳定的不同作用.
科学领域:
- 微生物学
- 分子生物学
- 遗传学
背景情况:
- 像大肠杆菌和细菌一样的细菌利用复杂的策略来管理DNA复制压力 (RS).
- 这些策略包括检测和稳定停滞的复制分叉 (RF),绕过DNA损伤,解决复制-转录冲突 (RTC) 和恢复复制.
- 虽然核心RS反应被保留,但由于环境适应,细菌物种之间的具体机制有所不同.
研究的目的:
- 为了比较大肠杆菌和B. subtilis中参与DNA复制应激反应的传感器,调节器和分子参与者.
- 阐明RecA重组酶在克服RS中的不同作用.
- 突出不同ReCA功能如何为维护基因组完整性在压力下发挥独特的细菌战略.
主要方法:
- 对大肠杆菌和B. subtilis分子机制的比较分析.
- 对DNA复制应激反应途径的现有文献的审查.
- 关注RecA重组酶在管理停滞的复制分叉中的差异性参与.
主要成果:
- 大肠杆菌中的 RecA 主要作用于复原体,促进整体反应和病变规避,在停滞的分叉中作用不太明确.
- 在B. subtilis中,ReCA经常在停滞的分叉上组装,微调损伤信号,并可能有助于分叉重塑,病变绕道,RTC解决和复制重启.
- 在E. coli和B. subtilis之间,ReCA的局部化和功能在停滞的复制分叉存在显著差异.
结论:
- 在细菌DNA复制压力管理中,RecA重组酶起着至关重要的,但又独特的作用.
- 大肠杆菌采用更广泛,更远端的ReCA中介反应,而B. subtilis则在停滞的分叉上更直接地使用ReCA进行微调应激适应.
- 了解这些特定物种的策略对于理解细菌基因组稳定机制至关重要.
相关概念视频
01:02The DNA Replication Fork
36.7K
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
36.7K
01:30Other Stress Responses in Bacteria
64
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
64
01:23Stringent Response in E. coli
52
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
52
02:35Replication in Prokaryotes
88.8K
Overview
88.8K
01:29Replication in Eukaryotes
14.5K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
14.5K
02:31Homologous Recombination
51.5K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
51.5K