Abstract
The ability to sense and respond to DNA damage is critical to maintenance of genomic stability and the prevention of cancer. In this study, we employed a genetic screen to identify a gene, NBA1 (new component of the BRCA1 A complex), that is required for resistance to ionizing radiation. The NBA1 protein localizes to sites of DNA damage and is required for G2/M checkpoint control. Proteomic analysis revealed that NBA1 is a component of the BRCA1 A complex, which also contains Brca1/Bard1, Abra1, RAP80, BRCC36, and BRE. NBA1 is required to maintain BRE and Abra1 abundance and for the recruitment of BRCA1 to sites of DNA damage. In depth bioinformatics analysis revealed that the BRCA1 A complex bears striking similarities to the 19S proteasome complex. Furthermore, we show that four members of the BRCA1-A complex possess a polyubiquitin chain- binding capability, thus forming a complex that might facilitate the deubiquitinating activity of the deubiquiti- nation enzyme BRCC36 or the E3 ligase activity of the BRCA1/BARD1 ligase. These findings provide a new perspective from which to view the BRCA1 A complex.
Original language | English (US) |
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Pages (from-to) | 729-739 |
Number of pages | 11 |
Journal | Genes and Development |
Volume | 23 |
Issue number | 6 |
DOIs | |
State | Published - Mar 15 2009 |
Keywords
- Abraxas
- BRCA1 A complex
- MPN domain
- Proteasome
- VWA domain
ASJC Scopus subject areas
- Genetics
- Developmental Biology