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Capillary electrophoretic mobility shift assay (CEMSA) of a protein-DNA complex
B Xue1, O S Gabrielsen, A H Myrset
1Department of Bioanalysis and Biochemistry, Nycomed Imaging, Oslo, Norway.
Journal of Capillary Electrophoresis
|September 2, 1998
Summary
Capillary electrophoresis offers a rapid, label-free method for studying DNA-protein interactions. This technique quickly detects sequence-specific binding using UV detection and a coated capillary, making it valuable for analyzing oncogenic proteins like c-Myb.
Area of Science:
- Biochemistry
- Molecular Biology
- Analytical Chemistry
Background:
- DNA-protein interactions are crucial for gene regulation and cellular processes.
- The oncogenic protein c-Myb plays a role in gene expression.
- Studying these interactions requires sensitive and efficient analytical methods.
Purpose of the Study:
- To demonstrate the utility of capillary electrophoresis (CE) for studying DNA-protein binding.
- To establish a rapid assay for sequence-specific DNA binding using CE.
- To utilize the DNA binding domain of c-Myb (R2R3) as a model system.
Main Methods:
- Capillary electrophoresis with UV detection at 260 nm.
- Use of a linear polymer buffer and a coated capillary.
- No DNA labeling or derivatization required.
- Analysis of protein-DNA complex formation via peak retardation.
Main Results:
- A specific protein-DNA complex was observed as a retarded peak in CE.
- Complex formation increased with higher protein concentrations.
- Free DNA peak decreased proportionally with increasing protein concentration.
- Sequence-specific binding could be assessed within 10 minutes.
Conclusions:
- Capillary electrophoresis is a powerful and efficient tool for analyzing DNA-protein binding.
- The developed CE method is rapid, label-free, and sensitive.
- This technique is suitable for studying sequence-specific binding of proteins like c-Myb.