在停滞的复制分叉中,SLF1与Histon H4和RAD18相互作用的结构机制
Emma L Ryder1, Nazia Nasir1, Amy E O Durgan1
1Astbury Centre for Structural Molecular Biology, School of Molecular & Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK.
Nucleic acids research
|October 3, 2024
概括
SLF1蛋白对于DNA修复至关重要,它与基因素和RAD18相互作用. 这项研究揭示了SLF1.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 生物化学 生物化学
背景情况:
- 通过阻碍复制,DNA损伤威胁到基因组的稳定性.
- 复制合的DNA修复机制可以保护停滞不前的复制叉.
- SLF1蛋白促进SMC5/6复合体在DNA损伤部位的招募.
研究的目的:
- 阐明SLF1相互作用的结构机制.
- 了解SLF1在DNA修复过程中招募SMC5/6复合物的作用.
主要方法:
- 确定了SLF1的ankyrin重复域的晶体结构,并使用了histon H4尾部.
- 采用基于结构的突变发生法来分析SLF1-RAD18相互作用.
- 研究了SLF1的DNA结合特性.
主要成果:
- 揭示了SLF1与非甲基化素H4尾巴的相互作用,说明了核酶体结合.
- 证实了SLF1的tBRCT域和RAD18.18之间的酸化依赖相互作用.
- 在SLF1.1上确定了RAD18结合接口的DNA结合能力.
结论:
- 提供了对SLF1与色素和DDR信号交互的关键结构见解.
- 更好地了解SMC5/6复杂的招募和DNA修复中的活动.
- 突出了SLF1在复制合DNA修复中的多方面的作用.
相关概念视频
01:02The DNA Replication Fork
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 forks, one in...
02:36DNA Damage can Stall the Cell Cycle
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...
02:37Restarting Stalled Replication Forks
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, a...
01:02The DNA Replication Fork
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 forks, one in...
02:36DNA Damage Can Stall the Cell Cycle
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...
02:37Restarting Stalled Replication Forks
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, a...