アブラキサスとRAP80は,DNA損傷反応に必要なBRCA1タンパク質複合体を形成しています
Bin Wang1, Shuhei Matsuoka, Bryan A Ballif
1Department of Genetics, Center for Genetics and Genomics, Brigham and Women's Hospital, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA.
まとめ
研究者らは,BRCA1に結合し,RAP80.0.を募集するのに役立つタンパク質であるAbraxasを発見しました. この複合体は,DNA損傷抵抗性,細胞サイクル制御,DNA修復に不可欠であり,BRCA1を助けます.
科学分野:
- 分子生物学は分子生物学である.
- がん研究 がん研究
- 細胞生物学 細胞生物学
背景:
- BRCA1タンパク質のBRCT繰り返しは,腫瘍抑制に不可欠である.
- BRCA1の相互作用を理解することは,がんの傾向と治療の鍵です.
研究 の 目的:
- BRCA1のBRCTリピートと相互作用する新しいタンパク質を特定するために.
- DNA損傷反応におけるこれらの相互作用の機能を解明する.
主な方法:
- 結合パートナーを特定するために,フォスフォペプチドの親和性プロテオミック分析.
- コイムノプレシピテーションとフォーカス形成は,タンパク質複合体の形成と局所化を研究するためのアッセイである.
主要な成果:
- アブラキサスは,特定のフォスフォモチーフを介してBRCA1のBRCTリピートに直接結合します.
- アブラキサスは,BACH1とCtIPを除いて,独特のBRCA1複合体を形成する.
- アブラキサスはRAP80をBRCA1に採用し,DNA損傷抵抗,G(2) -Mチェックポイント制御,DNA修復に不可欠な複合体を形成する.
- RAP80は,部分的には,ユビキチン化タンパク質の認識を通じて,DNA損傷部位でのBRCA1の蓄積を促進します.
結論:
- アブラキサス-RAP80複合体は,BRCA1経路の新しい構成要素です.
- この複合体は,DNA損傷に対する細胞の反応において重要な役割を果たします.
- この複合体をターゲットにすることで,BRCA1関連のがんに対する新しい治療戦略を提供することができる.
関連する概念動画
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:
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...
Homologous Recombination
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...
Restarting 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...
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...


