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An Improved Method for Identifying Specific DNA-Protein-Binding Sites In Vitro.
Molecular Biotechnology 2017 March
Binding of proteins to specific DNA sequences is essential for a variety of cellular processes such as DNA replication, transcription and responses to external stimuli. Chromatin immunoprecipitation is widely used for determining intracellular DNA fragments bound by a specific protein. However, the subsequent specific or accurate DNA-protein-binding sequence is usually determined by DNA footprinting. Here, we report an alternative method for identifying specific sites of DNA-protein-binding (designated SSDP) in vitro. This technique is mainly dependent on antibody-antigen immunity, simple and convenient, while radioactive isotope labeling and optimization of partial degradation by deoxyribonuclease (DNase) are avoided. As an example, the specific binding sequence of a target promoter by DdrO (a DNA damage response protein from Deinococcus radiodurans) in vitro was determined by the developed method. The central sequence of the binding site could be easily located using this technique.
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