| Enzyme Function |
FUNCTION: Involved in double-strand break repair and/or homologous recombination. Binds RAD51 and potentiates recombinational DNA repair by promoting assembly of RAD51 onto single-stranded DNA (ssDNA). Acts by targeting RAD51 to ssDNA over double-stranded DNA, enabling RAD51 to displace replication protein-A (RPA) from ssDNA and stabilizing RAD51-ssDNA filaments by blocking ATP hydrolysis. Part of a PALB2-scaffolded HR complex containing RAD51C and which is thought to play a role in DNA repair by HR. May participate in S phase checkpoint activation. Binds selectively to ssDNA, and to ssDNA in tailed duplexes and replication fork structures. May play a role in the extension step after strand invasion at replication-dependent DNA double-strand breaks; together with PALB2 is involved in both POLH localization at collapsed replication forks and DNA polymerization activity. In concert with NPM1, regulates centrosome duplication. Interacts with the TREX-2 complex (transcription and export complex 2) subunits PCID2 and SEM1, and is required to prevent R-loop-associated DNA damage and thus transcription-associated genomic instability. Silencing of BRCA2 promotes R-loop accumulation at actively transcribed genes in replicating and non-replicating cells, suggesting that BRCA2 mediates the control of R-loop associated genomic instability, independently of its known role in homologous recombination (PubMed:24896180). {ECO:0000269|PubMed:15115758, ECO:0000269|PubMed:15199141, ECO:0000269|PubMed:15671039, ECO:0000269|PubMed:18317453, ECO:0000269|PubMed:20729832, ECO:0000269|PubMed:20729858, ECO:0000269|PubMed:20729859, ECO:0000269|PubMed:21084279, ECO:0000269|PubMed:21719596, ECO:0000269|PubMed:24485656, ECO:0000269|PubMed:24896180}. |
| Subcellular Location |
SUBCELLULAR LOCATION: Nucleus {ECO:0000269|PubMed:24013206, ECO:0000269|PubMed:26833090, ECO:0000305|PubMed:21276791}. Cytoplasm, cytoskeleton, microtubule organizing center, centrosome {ECO:0000269|PubMed:21276791}. Note=Colocalizes with ERCC5/XPG to nuclear foci following DNA replication stress. {ECO:0000269|PubMed:26833090}. |
| Post Translational Modification |
PTM: Phosphorylated by ATM upon irradiation-induced DNA damage. Phosphorylation by CHEK1 and CHEK2 regulates interaction with RAD51. Phosphorylation at Ser-3291 by CDK1 and CDK2 is low in S phase when recombination is active, but increases as cells progress towards mitosis; this phosphorylation prevents homologous recombination-dependent repair during S phase and G2 by inhibiting RAD51 binding. {ECO:0000269|PubMed:15199141, ECO:0000269|PubMed:15800615, ECO:0000269|PubMed:18317453}.; PTM: Ubiquitinated in the absence of DNA damage; this does not lead to proteasomal degradation. In contrast, ubiquitination in response to DNA damage leads to proteasomal degradation. {ECO:0000269|PubMed:15314155}. |