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        Electrophoretic Mobility Shift Assays for ProteinDNA Complexes Involved in DNA Repair

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        The electrophoretic mobility shift assay (EMSA) can be used to study proteins that bind to DNA structures created by DNA-damaging agents. UV-damaged DNA-binding protein (UV-DDB), which is involved in nucleotide excision repair, binds to DNA damaged by ultraviolet radiation or the anticancer drug cisplatin. Ku, XRCC4/Ligase IV, and DNA–PKcs, which are involved in the repair of DNA double-strand breaks by nonhomologous end joining, assemble in complexes at DNA ends. This chapter will describe several EMSA protocols for detecting different DNA repair protein–DNA complexes. To obtain additional information, one can apply variations of the EMSA, which include the reverse EMSA to detect binding of 35 S-labeled protein to damaged DNA, and the antibody supershift assay to detect the presence of a specific protein in the protein–DNA complex.
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