Anti-BRCA1 Antibody Picoband®

BRCA1, also known as BRCC1, is a gene which mapping to 17q21.3. This gene encodes a nuclear phosphoprotein that plays a role in maintaining genomic stability, and it also acts as a tumor suppressor. The encoded protein combines with other tumor suppressors, DNA damage sensors, and signal transducers to form a large multi-subunit protein complex known as the BRCA1-associated genome surveillance complex (BASC) . BRCA1 product associates with RNA polymerase II, and through the C-terminal domain, also interacts with histone deacetylase complexes. This protein thus plays a role in transcription, DNA repair of double-stranded breaks, and recombination. In addition to it, BRCA1 may normally serve as a negative regulator of mammary epithelial cell growth and that this function is compromised in breast cancer either by mutation or by alterations in gene expression.

E.coli-derived human BRCA1 recombinant protein (Position: E1661-Y1863) . Human BRCA1 shares 65% and 66% amino acid (aa) sequences identity with mouse and rat BRCA1, respectively.

Cancer, Cancer Susceptibility, Cell Biology, Chromatin Modifying Enzymes, DNA/RNA, DNA Damage & Repair, DNA Damage Response, Epigenetics and Nuclear Signaling, Oncoproteins/Suppressors, Proteasome / Ubiquitin, Proteolysis/Ubiquitin, Ring Finger E3 Ligase, Transcription, Tumor Suppressors, Ubiquitin E3 Enzymes

E3 ubiquitin-protein ligase that specifically mediates the formation of 'Lys-6'-linked polyubiquitin chains and plays a central role in DNA repair by facilitating cellular responses to DNA damage. It is unclear whether it also mediates the formation of other types of polyubiquitin chains. The E3 ubiquitin-protein ligase activity is required for its tumor suppressor function. The BRCA1-BARD1 heterodimer coordinates a diverse range of cellular pathways such as DNA damage repair, ubiquitination and transcriptional regulation to maintain genomic stability. Regulates centrosomal microtubule nucleation. Required for normal cell cycle progression from G2 to mitosis. Required for appropriate cell cycle arrests after ionizing irradiation in both the S-phase and the G2 phase of the cell cycle. Involved in transcriptional regulation of P21 in response to DNA damage. Required for FANCD2 targeting to sites of DNA damage. May function as a transcriptional regulator. Inhibits lipid synthesis by binding to inactive phosphorylated ACACA and preventing its dephosphorylation. Contributes to homologous recombination repair (HRR) via its interaction with PALB2, fine-tunes recombinational repair partly through its modulatory role in the PALB2-dependent loading of BRCA2-RAD51 repair machinery at DNA breaks. Component of the BRCA1-RBBP8 complex which regulates CHEK1 activation and controls cell cycle G2/M checkpoints on DNA damage via BRCA1-mediated ubiquitination of RBBP8. Acts as a transcriptional activator (PubMed:20160719) . .

1. Lee, M.-H., Lahusen, T., Wang, R.-H., Xiao, C., Xu, X., Hwang, Y.-S., He, W.-W., Shi, Y., Deng, C.-X. Yin Yang 1 positively regulates BRCA1 and inhibits mammary cancer formation. Oncogene 31: 116-127, 2012. 2. Thompson, M. E., Jensen, R. A., Obermiller, P. S., Page, D. L., Holt, J. T. Decreased expression of BRCA1 accelerates growth and is often present during sporadic breast cancer progression. Nature Genet. 9: 444-450, 1995. 3. Wang, B., Hurov, K., Hofmann, K., Elledge, S. J. NBA1, a new player in the Brca1 A complex, is required for DNA damage resistance and checkpoint control. Genes Dev. 23: 729-739, 2009.

Store at -20°C for one year from date of receipt. After reconstitution, at 4°C for one month. It can also be aliquotted and stored frozen at -20°C for six months. Avoid repeated freeze-thaw cycles.

Nucleus . Chromosome . Cytoplasm . Localizes at sites of DNA damage at double-strand breaks (DSBs) ; recruitment to DNA damage sites is mediated by the BRCA1-A complex. Translocated to the cytoplasm during UV-induced apoptosis. .