anti-human Rad51 antibody, rabbit serum


SKU: 70-001 Research Area: Applications:



Human Rad51 protein is a functional and structural homolog of E.coli RecA protein, which plays a major role in genetic recombination and recombination repair by mediating strand exchange reaction between homologous DNA strands. Rad51 functionally and physically interacts with its paralogs Dmc1, Rad51B, Rad51D, Xrcc2 and Xrcc3, and also with Rad52 in recombination processes. It also interacts with oncogenes and tumor suppressors such as BRACA1, BRACA2, and p53 for the maintenance of genome stability.



Reactivity: Human, rodents, chicken and xenopus

Immunogen: Full-size recombinant human Rad51 protein (His-tag removed)

Form: Rabbit antiserum added with 0.09% sodium azide.

Storage: Shipped at 4℃and stored at -20℃.



  • Western blotting (1/1,000- 1/5,000 dilution). High specificity
  • Immunoprecipitation
  • Immunofluorescent staining (Detection of foci formation by indirect immunofluorescence method) (1/100-1/6,000)
  • For IHC, immunogen affinity purified anti-Rad51 antibody (70-012) is recommended.


Data Link UniProtKB/Swiss-Prot Q06609 (RAD51_HUMAN)


References: This antibody has been used in the following publications.

  1. Nakano T et al, Homologous Recombination but Not Nucleotide Excision Repair Plays a Pivotal Role in Tolerance of DNA-Protein Cross-links in Mammalian Cells. J. Biol. Chem. 284:27065-27076 (2009).JBC open access pdf IF (human)
  2. Vaz F et al, Mutation of the Rad51C gene in a Fanconi anemia-like disorder. Nature Genetcs 42:406-409 (2010) PMID: 20400963 IF (human)
  3. Nakada S. et al. RNF8 regulates assembly of RAD51 at DNA double-strand breaks in the absence of BRCA1 and 53BP1. Cancer Res.2012 Oct 1;72(19):4974-83. WB, IF (human)
  4. Shima H. et al, Activation of the SUMO modification system is required for the accumulation of RAD51 at sites of DNA damage. J Cell Sci. 126: 5284-92 ( 2013) PMID: 24046452 WB, IF (human)
  5. Okimoto S. et al. hCAS/CSE1L regulates RAD51 distribution and focus formation for homologous recombinational repair. Genes Cells 20, 681–694, (2015) IF (human)
  6. Kobayashi S. et al. Rad18 and Rnf8 facilitate homologous recombination by two distinct mechanisms, promoting Rad51 focus formation and suppressing the toxic effect of nonhomologous end joining. 2015 Aug 13;34(33):4403-11. IF (human, chicken)
  7. Hoa N N. BRCA1 and CtIP Are Both Required to Recruit Dna2 at Double-Strand Breaks in Homologous Recombination. PLOS one.: April 24, 2015. PMC 4409214/ IF (chicken)
  8. Tada K. et al. Abacavir, an anti–HIV-1 drug, targets TDP1-deficient adult T cell leukemia. Science Advances24 Apr 2015: Vol. 1, No. 3. PMID 26601161 IF (human)
  9. Orthwein A et al. A mechanism for the suppression of homologous recombination in G1 cells. 2015 Dec 17;528(7582):422-6. IF (human)
  10. Ning-Ang Liu. Regulation of homologous recombinational repair by lamin B1 in radiation-induced DNA damage. FASEB J.2015 Jun;29(6):2514-25. WB, IP, IF (human)

Fig.1 Detection of endogenous Rad51 in whole cell extract of HeLa cells. The antibody was used at 1/2,000 dilution.

Fig.2 Detection of endogenous Rad51 in crude extract of Xenopus. The antibody was used at 1/1,000 dilution.

Fig.3 Detection of Rad51 foci: formation induced by DNA damage. Normal human diploid cells were irradiated by X-ray (0.5 Gy) and after 6 hr incubation, the cells were fixed and immunostained by using anti-Rad51 serum at 1/100 dilution) as the primary antibody and Alexa 594 labeled anti-rabbit antibody as the secondary antibody. (The picture was kindly provided by Prof. K. Suzuki, Medical School of Nagasaki Univ.)

Fig.4 Induction of Rad51 foci formation by X-ray Irradiation. Human osteosarcoma U2OS cells X-ray irradiation before and 2h after were immunostained with the anti-Rad51 antibody at 1/6,000 dilution. The lower panels were the same cells with Hoechst.


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70-012 anti-Rad51 antibody, rabbit polyclonal, affinity-purified


Protocol for the use of anti-Rad51 (human) antibody, rabbit serum, for immuno-staining to observe foci-formation on chromosome after incubation of DNA-damaged cells as follows. (provided by Prof. K Suzuki)


  1. Incubate cells on glass slips for at least 24 hours.
  2. Wash cells with PBS once.
  3. Fix cells with cold methanol for 10 min on ice.
  4. Wash cells with PBS.
  5. Incubate cells with 0.5% Triton X-100 for 5 min on ice.
  6. Wash cells with PBS extensively.
  7. Incubate cells with anti-Rad51 antibody diluted (1:100) in TBS-DT (TBS: 20 mM Tris-HCl, pH7.6, 137 mM NaCl, containing 0.1% Tween-20 and 5% Skim milk).
  8. Wash cells with PBS.
  9. Incubate cells with Alexa594-labeled anti-rabbit antibody diluted (1:1000) in TBS-DT


In addition to the above;

  1. Different fixation methods have to be employed depending on types of cells.
  2. Different blocking reagents have to be tried in case of high background.
  3. In the absence of DNA-damage, Rad51 is localized diffusely in whole nucleus but Rad51 accumulates as foci on chromosome with double strand DNA breaks or stalled replication forks.
Title Type Size
70-001 anti-Rad51(human)antibody(rabbit-serum) 03212018 application/pdf 361 KB

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