National Institutes of Health/National Cancer Institute (NIH/NCI)
CA187561
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM58015
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
CA92267
米国
引用
ジャーナル: Nucleic Acids Res / 年: 2020 タイトル: DSS1 and ssDNA regulate oligomerization of BRCA2. 著者: Hang Phuong Le / Xiaoyan Ma / Jorge Vaquero / Megan Brinkmeyer / Fei Guo / Wolf-Dietrich Heyer / Jie Liu / 要旨: The tumor suppressor BRCA2 plays a key role in initiating homologous recombination by facilitating RAD51 filament formation on single-stranded DNA. The small acidic protein DSS1 is a crucial partner ...The tumor suppressor BRCA2 plays a key role in initiating homologous recombination by facilitating RAD51 filament formation on single-stranded DNA. The small acidic protein DSS1 is a crucial partner to BRCA2 in this process. In vitro and in cells (1,2), BRCA2 associates into oligomeric complexes besides also existing as monomers. A dimeric structure was further characterized by electron microscopic analysis (3), but the functional significance of the different BRCA2 assemblies remains to be determined. Here, we used biochemistry and electron microscopic imaging to demonstrate that the multimerization of BRCA2 is counteracted by DSS1 and ssDNA. When validating the findings, we identified three self-interacting regions and two types of self-association, the N-to-C terminal and the N-to-N terminal interactions. The N-to-C terminal self-interaction of BRCA2 is sensitive to DSS1 and ssDNA. The N-to-N terminal self-interaction is modulated by ssDNA. Our results define a novel role of DSS1 to regulate BRCA2 in an RPA-independent fashion. Since DSS1 is required for BRCA2 function in recombination, we speculate that the monomeric and oligomeric forms of BRCA2 might be active for different cellular events in recombinational DNA repair and replication fork stabilization.
名称: BRCA2-DSS1-ssDNA / タイプ: complex / ID: 1 / 親要素: 0 詳細: Full-length human tumor suppressor BRCA2 protein in complex with DSS1 and dT100 oligo with crosslinking
由来(天然)
生物種: Homo sapiens (ヒト)
組換発現
生物種: Homo sapiens (ヒト) / 組換細胞: HEK293
分子量
実験値: 474 kDa/nm
-
実験情報
-
構造解析
手法
ネガティブ染色法
解析
単粒子再構成法
試料の集合状態
particle
-
試料調製
緩衝液
pH: 7.5
染色
タイプ: NEGATIVE / 材質: 2% uranyl acetate 詳細: BRCA2 complex was applied to glow-discharged continuous carbon copper grids and incubated for 2 min. Grids were washed briefly with 5 mM Mg(Acet)2 for three times to remove buffer, sucrose, ...詳細: BRCA2 complex was applied to glow-discharged continuous carbon copper grids and incubated for 2 min. Grids were washed briefly with 5 mM Mg(Acet)2 for three times to remove buffer, sucrose, and glycerol. Samples were then stained with 2% uranyl acetate, blotted with filter paper, and air dried.