Abstract
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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Abbreviations
- ChIP:
-
Chromatin immunoprecipitation
- SSDP:
-
Specific sites of DNA-protein-binding
- DdrO:
-
A DNA damage response protein from Deinococcus radiodurans
- EMSA:
-
Electrophoretic mobility shift assay
- SPR:
-
Surface plasmon resonance analyses
- PBM:
-
Protein-binding microarray
- ChIA-PET:
-
Chromatin interaction analysis by paired-end tag sequencing
- DHS:
-
DNase I hypersensitive sites
- ENCODE:
-
Encyclopedia of DNA elements
- DDR:
-
DNA damage response
- recA :
-
Recombinant A
- MBP:
-
Maltose-binding protein
- TEV:
-
Tobacco etch virus
- IPTG:
-
Isopropyl β-d-1-thiogalactopyranoside
- BPB:
-
Bromophenol blue
- RDRM:
-
Radiation and desiccation response motif
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Acknowledgement
This work was supported by grants from the National Natural Science Foundation of China (31210103904, 31370102, 31570058), the Natural Science Foundation of Zhejiang Province (LY13C010001) and the Public Project of Zhejiang Province (2014C33024) and the Project for Experimental Technology of Zhejiang University.
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Liangyan Wang and Huizhi Lu have contributed equally to the paper as first authors.
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Wang, L., Lu, H., Wang, Y. et al. An Improved Method for Identifying Specific DNA-Protein-Binding Sites In Vitro. Mol Biotechnol 59, 59–65 (2017). https://doi.org/10.1007/s12033-017-9993-y
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DOI: https://doi.org/10.1007/s12033-017-9993-y