这种SUMO修饰途径与BRCA1对基因毒性压力反应有关
Joanna R Morris1, Chris Boutell, Melanie Keppler
1Department of Medical and Molecular Genetics, King's College London, Guy's Medical School Campus, London SE1 9RT, UK. jo.morris@genetics.kcl.ac.uk
Nature
|December 18, 2009
概括
该SUMOylation途径调节BRCA1,这是DNA损伤修复中的关键蛋白质. 这种修改增强了BRCA1的功能.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- BRCA1突变增加了乳腺癌和卵巢癌的风险.
- BRCA1参与了DNA损伤反应和泛素酶活性.
- 目前尚不完全了解BRCA1的调节.
研究的目的:
- 研究SUMOylation在BRCA1调节中的作用.
- 了解SUMOylation如何影响BRCA1在DNA损伤反应中的功能.
主要方法:
- 在对基因毒性压力的反应中研究了BRCA1的SUMO修饰.
- 检查了BRCA1与SUMO蛋白和Ubc9在DNA损伤部位的共同定位.
- 评估了PIAS SUMO E3酶对BRCA1活性和DNA修复的影响.
主要成果:
- 在基因毒性压力时,BRCA1通过SUMOylation进行修饰.
- SUMOylation 增强了 BRCA1/BARD1 异构体酶活性,将其定义为 SUMO 调节的泛素酶 (SRUbL).
- PIAS SUMO连接酶对于BRCA1泛素连接酶活性和高效的双链断裂修复至关重要.
结论:
- 该SUMOylation途径是BRCA1功能的重要调节者.
- SUMOylation增强了BRCA1在DNA损伤反应和修复中的作用.
- 这项研究确定BRCA1是SUMO调节的泛素酶 (SRUbL).
相关概念视频
The Intrinsic Apoptotic Pathway
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
Base Excision Repair
One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
The first step of...
Base Excision Repair
One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
The first step of...
Interactions Between Signaling Pathways
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
DNA 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...
DNA 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...


