AI Article Synopsis
- The BRCA2 tumor suppressor is essential for repairing DNA double-strand breaks through a process called homologous recombination, specifically involving RAD51 protein.
- Research shows that the C-terminal Recombinase Binding (CTRB) region of BRCA2, found in its exon 27, has DNA-binding capabilities that enhance RAD51's ability to facilitate DNA strand exchange.
- The study highlights the importance of CTRB in protecting DNA replication forks during repair processes, suggesting that loss of this function can lead to serious developmental issues, such as embryonic lethality.
Article Abstract
The tumor suppressor BRCA2 participates in DNA double-strand break repair by RAD51-dependent homologous recombination and protects stressed DNA replication forks from nucleolytic attack. We demonstrate that the C-terminal Recombinase Binding (CTRB) region of BRCA2, encoded by gene exon 27, harbors a DNA binding activity. CTRB alone stimulates the DNA strand exchange activity of RAD51 and permits the utilization of RPA-coated ssDNA by RAD51 for strand exchange. Moreover, CTRB functionally synergizes with the Oligonucleotide Binding fold containing DNA binding domain and BRC4 repeat of BRCA2 in RPA-RAD51 exchange on ssDNA. Importantly, we show that the DNA binding and RAD51 interaction attributes of the CTRB are crucial for homologous recombination and protection of replication forks against MRE11-mediated attrition. Our findings shed light on the role of the CTRB region in genome repair, reveal remarkable functional plasticity of BRCA2, and help explain why deletion of Brca2 exon 27 impacts upon embryonic lethality.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9879961 | PMC |
| http://dx.doi.org/10.1038/s41467-023-36211-x | DOI Listing |
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