运输体调节了受过氧化压力的大肠杆菌复制的恢复
Natalie E Wang1, Eleanor J Courcelle1, Samantha M Coltman1
1Department of Biology, Portland State University, Portland, OR, 97201, USA.
概括
转运体对于在大肠杆菌中氧化应激后恢复DNA复制至关重要. 操纵进出口显著影响恢复率,突出显示它们在细胞修复机制中的作用.
科学领域:
- 分子生物学分子生物学
- 细胞应激反应的应激反应
- 微生物学 微生物学
背景情况:
- 由过氧化等物质引起的氧化应激会使细胞功能必不可少的依赖铁的蛋白质失活.
- 可以替代某些酶中的铁或作为辅助因子,有助于功能恢复.
- 在氧化应激下,DNA复制对铁耗尽特别敏感,需要来恢复复制.
研究的目的:
- 研究载体在使得大肠杆菌在氧化应激后的DNA复制恢复中的作用.
- 为了确定参与这种回收过程的特定的运输蛋白和调节剂.
主要方法:
- 对大肠杆菌菌株进行基因操作,以删除或改变载体 (mntH,mntP,mntR) 的功能.
- 在野生型和突变菌株中对过氧化处理后DNA复制恢复率的评估.
- 分析载体突变对与其他调节性突变 (毛皮,氧R) 结合复制恢复的影响.
主要成果:
- 删除进口商MntH受损复制恢复的删除.
- 删除出口器MntP或调节器MntR显著加速复制恢复.
- 不受监管的进口恢复了即使没有Fur (铁恒温调节器) 的复制,而oxyR突变体 (受损的进口上调) 的恢复被阻止.
结论:
- 运输系统,包括进出口,是DNA复制恢复后氧化应激的关键调节者.
- 该研究确定MntH,MntP和MntR是平衡和细胞弹性中的关键参与者.
- 这些发现强调了运输在克服氧化挑战期间与铁相关的损伤方面的核心作用.
相关概念视频
01:20Mismatch Repair
4.9K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.9K
01:02The DNA Replication Fork
36.1K
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...
36.1K
02:37Restarting Stalled Replication Forks
5.8K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
5.8K
01:29Coordination of Gene Expression Processes in Bacteria
40
The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
40
01:23Stringent Response in E. coli
31
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...
31
02:35Replication in Prokaryotes
87.6K
Overview
87.6K