Anti-p53 Binding Protein 1 (53BP1, p202), clone 5H37

53BP1 binds to the tumor suppressor protein p53 and has a potential role in DNA damage responses. Small interfering RNA (siRNA) directed against 53BP1 in mammalian cells to demonstrated that 53BP1 is a key transducer of the DNA damage checkpoint signal. 53BP1 was required for p53 accumulation, G2-M checkpoint arrest, and the intra-S-phase checkpoint in response to ionizing radiation. 53BP1 played a partially redundant role in phosphorylation of the downstream checkpoint effector proteins Brca1 and Chk2 but was required for the formation of Brca1 foci in a hierarchical branched pathway for the recruitment of repair and signaling proteins to sites of DNA damage. Applications: Suitable for use in Western Blot, Immunoprecipitation and Immunocytochemistry. Other applications not tested. Recommended Dilution: Western Blot: 1-4ug/ml detected 53BP1 in lysates from HeLa cells., Immunoprecipitation: Has been reported by an independent laboratory to immunoprecipitate 53BP1 from HeLa cell lysate., Immunocytochemistry: Has been reported by an independent laboratory to show positive immunostaining for 53BP1 in HeLa cells fixed with 3% paraformaldehyde and permeabilized in 0.5% Triton X-100., Optimal dilutions to be determined by the researcher. Storage and Stability: May be stored at 4°C for short-term only. For long-term storage, store at -20°C. Aliquots are stable for 12 months after receipt at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.