This antibody gave a positive signal in the following Human lysates:
Jurkat Whole Cell
HepG2 Whole Cell
F9 Whole Cell (data not shown)
Y-79 Nuclear Lysate (data not shown)
Caco 2 Whole Cell (data not shown)
Storage instructionsShipped at 4°C. Store at +4°C short term (1-2 weeks). Upon delivery aliquot. Store at -20°C or -80°C. Avoid freeze / thaw cycle.
The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.
Use a concentration of 1 µg/ml. Detects a band of approximately 110 kDa (predicted molecular weight: 101 kDa).
Use a concentration of 1 µg/ml.
FunctionEndonuclease that cooperates with the MRE11-RAD50-NBN (MRN) complex in processing meiotic and mitotic double-strand breaks (DSBs) by ensuring both resection and intrachromosomal association of the broken ends. Functions downstream of the MRN complex and ATM, promotes ATR activation and its recruitment to DSBs in the S/G2 phase facilitating the generation of ssDNA. Component of the BRCA1-RBBP8 complex that regulates CHEK1 activation and controls cell cycle G2/M checkpoints on DNA damage. Promotes microhomology-mediated alternative end joining (A-NHEJ) during class-switch recombination and plays an essential role in chromosomal translocations.
Involvement in diseaseSeckel syndrome 2 Jawad syndrome Genetic variability in RBBP8 is noted as a factor in BRCA1-associated breast cancer risk (PubMed:21799032). Exhibits sensitivity to tamoxifen in certain breast cancer cell lines (PubMed:18171986).
Sequence similaritiesBelongs to the COM1/SAE2/CtIP family.
DomainThe PXDLS motif binds to a cleft in CtBP proteins. The damage-recruitment motif is required for DNA binding and translocation to sites of DNA damage.
Post-translational modificationsAcetylated. Deacetylation by SIRT6 upon DNA damage promotes DNA end resection. Hyperphosphorylation upon ionizing radiation results in dissociation from BRCA1. Phosphorylation at Thr-847 by CDK1 is essential for the recruitment to DNA and the DNA repair function. Phosphorylated on Ser-327 as cells enter G2 phase. This phosphorylation is required for binding BRCA1 and for the G2/M DNA damage transition checkpoint control. Ubiquitinated (PubMed:14654780, PubMed:16818604). Ubiquitination at multiple sites by BRCA1 (via its N-terminal RING domain) does not lead to its proteosomal degradation but instead the ubiquitinated RBBP8 binds to chromatin following DNA damage and may play a role in G2/M checkpoint control (PubMed:16818604). Ubiquitinated by RNF138 at its N-terminus (PubMed:26502057).
Cellular localizationNucleus. Chromosome. Associates with sites of DNA damage in S/G2 phase (PubMed:10764811). Ubiquitinated RBBP8 binds to chromatin following DNA damage (PubMed:16818604).
ICC/IF image of ab38016 stained MCF-7 cells. The cells were fixed with 100% methanol (5 min) and then incubated in 1%BSA / 10% normal Goat serum / 0.3M glycine in 0.1% PBS-Tween for 1h to permeabilise the cells and block non-specific protein-protein interactions. The cells were then incubated with the antibody (ab38016 at 1µg/ml) overnight at +4°C. The secondary antibody (green) was Alexa Fluor® 488 Goat anti-Rabbit IgG (H+L) used at a 1/1000 dilution for 1h. Alexa Fluor® 594 WGA was used to label plasma membranes (red) at a 1/200 dilution for 1h. DAPI was used to stain the cell nuclei (blue). This antibody also gave a positive result in 4% PFA fixed (10 min) HeLa and HepG2 cells at 1µg/ml, and in 100% methanol fixed (5 min) HeLa, HepG2 and MCF7 cells at 1µg/ml.
References for Anti-CtIP antibody (ab38016)
has not yet been referenced specifically in any publications.
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