RAP80将BRCA1定位在DNA损伤部位的特定泛素结构上
Bijan Sobhian1, Genze Shao, Dana R Lilli
1Dana-Farber Cancer Institute and Department of Genetics and Department of Medicine, Harvard Medical School, 44 Binney Street, Boston, MA 02115, USA.
概括
研究人员发现BRCA1蛋白如何与DNA损伤部位结合. 在双链断裂 (DSB) 时,RAP80蛋白准BRCA1到无素链,这对于DNA修复和细胞周期检查点至关重要.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- DNA 修复机制的修复机制
背景情况:
- 在BRCA1的BRCT域中发生的突变会损害其修复DNA双链断裂 (DSB) 的功能.
- 通过BRCA1识别DSBs的精确分子相互作用仍然不清楚.
- 了解这些相互作用对于癌症治疗的发展至关重要.
研究的目的:
- 阐明BRCA1招募到DNA双链断裂 (DSB) 的分子机制.
- 为了识别参与将BRCA1向DNA损伤部位的蛋白质相互作用.
- 了解在BRCA1介导的DNA修复中,乌比奎丁修饰的作用.
主要方法:
- 研究了BRCA1 BRCT域与泛素结合蛋白RAP80.0之间的相互作用.
- 利用共免疫沉和体外结合试验来研究蛋白质相互作用.
- 研究了RAP80在将BRCA1-BARD1 E3结合酶和BRCC36 DUB复合体向DSBs中的作用.
主要成果:
- 报告了BRCA1 BRCT域与RAP80.0之间的新型相互作用.
- 证明RAP80针对包括BRCA1-BARD1和BRCC36在内的复合物,在DSB中准特定的泛素链 (K6和K63链接).
- 表明这种向取决于DSB中的MDC1和gammaH2AX修饰.
结论:
- 通过RAP80识别和转换乌比基链对于将BRCA1复合物招募到DSBs至关重要.
- 这些事件对于激活细胞周期检查点和在电离辐射后的DNA修复反应至关重要.
- 突出了在BRCA1依赖的DNA修复和瘤抑制中乌比奎丁信号通路的重要性.
相关概念视频
Nucleotide Excision Repair
Overview
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...
Long-patch Base Excision Repair
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:
Nucleotide Excision Repair
Overview
Base-pairing and DNA Repair
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
Nucleotide Excision Repair
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...


