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Electrophoretic mobility shift assays to study protein binding to damaged DNA.
Vaughn Smider1, Byung Joon Hwang, Gilbert Chu
1Integrigen Inc., Novato, CA, USA.
Methods in Molecular Biology (Clifton, N.J.)
|May 6, 2006
Summary
Electrophoretic mobility shift assays (EMSA) identify DNA repair proteins binding to damaged DNA. Protocols are detailed for UV-damaged DNA, cisplatin-damaged DNA, and DNA ends, including variations for further protein analysis.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- DNA damage triggers repair mechanisms involving specific protein interactions.
- Electrophoretic mobility shift assay (EMSA) is a key technique for studying DNA-protein interactions.
- Identifying DNA-binding proteins is crucial for understanding DNA repair pathways.
Purpose of the Study:
- To describe established and modified Electrophoretic Mobility Shift Assay (EMSA) protocols.
- To detail methods for detecting proteins that bind to various forms of damaged DNA.
- To provide insights into variations of EMSA for enhanced characterization of DNA-binding proteins.
Main Methods:
- Standard EMSA protocols for detecting DNA-binding proteins.
- Application of EMSA to UV-damaged DNA, cisplatin-damaged DNA, and DNA ends.
- Utilization of modified EMSA techniques, including reverse EMSA and antibody supershift assays.
Main Results:
- EMSA successfully identifies proteins binding to damaged DNA substrates.
- Specific DNA repair proteins, such as UV-damaged DNA binding protein, Ku, and DNA-PKcs, can be detected.
- Reverse EMSA and antibody supershift assays provide additional data on protein identity and complex composition.
Conclusions:
- EMSA is a versatile and effective method for studying DNA repair protein interactions.
- The described protocols and variations facilitate the investigation of critical DNA repair mechanisms.
- This methodology aids in understanding cellular responses to DNA damage.