RAD51-BRCA2複合体の構造からDNA再結合の洞察

Luca Pellegrini¹, David S Yu, Thomas Lo

¹University of Cambridge, Department of Biochemistry, Tennis Court Road, Cambridge CB2 1GA, UK.

Nature

|November 21, 2002

まとめ

BRCA2タンパク質である.

科学分野:

バイオケミストリーバイオケミストリー
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

BRCA2は,同類再結合によるDNA修復に不可欠です.
それはRAD51再結合酵素の機能を制御します.
RAD51はDNAの再結合と修復経路に不可欠です.

研究の目的:

BRCA2 BRCリピートおよびRAD51複合体の構造を決定するために.
BRCA2がRAD51アセンブリを制御する仕組みを理解するために,
BRCA2関連がんの感受性の構造的基礎を解明する.

主な方法:

タンパク質複合体の構造を決定するX線結晶学.
タンパク質の相互作用を研究するための生化学分析.
保存されたモチーフのバイオ情報分析.

主要な成果:

BRCA2のBRC重複はRAD51のオリゴメリゼーションモチーフを模倣しています.
BRCA2は,RAD51核タンパク質のフィラメントアセンブリを,このミミクリを通じて制御する.
保存されたRAD51相互作用モチーフはハイライトされています.
BRCにおけるがん関連変異は,RAD51の相互作用を妨害する.

結論:

BRCA2は,RAD51フィラメント形成を制御することによって,DNA修復を調節する.
BRCリピートの構造は,RAD51の規制に関する洞察を提供します.
BRCA2変異の構造的な理解は,がんの感受性メカニズムに光を当てます.

さらに関連する動画

06:24

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

Published on: February 13, 2019

07:55

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

関連する概念動画

02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...

02:31

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...

02:37

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...

02:27

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,