PARP1和PARylation通过稳定CSB-RNAPII复合体来促进转录合的DNA修复
Mihaela Robu1, Rashmi G Shah1, Diana van den Heuvel2
1CHU de Quebec Laval University Research Centre, Neuroscience Axis, Quebec City (QC), G1V 4G2, Canada.
Nucleic acids research
|December 12, 2025
概括
聚ADP-ribose) 聚合酶-1 (PARP1) 对于启动转录合核酸切除修复 (TCR) 是至关重要的. 在停滞的RNA聚合酶II中,PARP1稳定了Cockayne综合征蛋白B (CSB),促进了DNA修复.
科学领域:
- 分子生物学分子生物学
- DNA 修复机制的修复机制
- 生物化学 生物化学
背景情况:
- 转录合核酸切除修复 (TC-NER或TCR) 是由可凯恩综合征蛋白B (CSB) 与停滞的RNA聚合酶II (RNAPII) 相互作用启动的.
- 众所周知,PARP1聚合酶-1 (PARP1) 参与了全球基因组NER.
研究的目的:
- 调查PARP1在TCR启动中的作用.
- 阐明PARP1在TCR期间影响CSB功能的分子机制.
主要方法:
- 生物化学测试用于研究蛋白质-蛋白质相互作用和酶活性.
- 细胞测试以评估TCR效率.
- 对PARP1突变性Caenorhabditis elegans进行分析.
主要成果:
- PARP1 与 CSB 在损伤停滞的 RNAPII 相互作用并稳定它,从而促进 TCR 启动.
- CSB刺激了PARP1的活动,导致CSB PARylation,这调节了其稳定和ATPase功能.
- 失去PARP1或抑制PAR合成/降解会降低TCR的效率.
- PARP1突变的C. elegans表现出一个显著的TCR缺陷表型.
结论:
- 在TCR的启动过程中,PARP1起着关键的,进化性保守的作用.
- 在TCR中,PARP1和PAR代谢对于有效的CSB功能至关重要.
- 这项研究揭示了一个新的机制,通过CSB监管将PARP1与TCR启动联系起来.
相关概念视频
DNA Damage can Stall the Cell Cycle
9.9K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.9K
DNA Damage Can Stall the Cell Cycle
3.0K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
3.0K
Restarting Stalled Replication Forks
6.2K
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,...
6.2K
Long-patch Base Excision Repair
7.8K
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
7.8K
Homologous Recombination
62.4K
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...
62.4K
Nucleotide Excision Repair
4.9K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
4.9K


