Plasmid DNA Binding Electrophoretic Mobility Shift Assay with Eukaryotic Topoisomerase II

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• DNA topoisomerase II is crucial for managing DNA topology.
• Understanding enzyme-DNA interactions is vital for drug development and molecular biology.

Purpose of the Study:

• To describe the electrophoretic mobility shift assay (EMSA) for studying DNA topoisomerase II binding.
• To highlight EMSA's utility in determining binding parameters.

Main Methods:

• Utilizes agarose gel electrophoresis to separate DNA-protein complexes.
• Measures changes in DNA migration as a function of enzyme concentration.
• Analyzes DNA-enzyme binding under diverse conditions.

Main Results:

• EMSA demonstrates increased DNA topoisomerase II binding with higher enzyme concentrations.
• The assay shows a decreased DNA migration (upward shift) with increasing binding.
• Binding parameters can be established by comparing shifts across varying conditions.

Conclusions:

• EMSA is an effective and cost-efficient method for assessing DNA topoisomerase II-DNA interactions.
• The assay allows for the investigation of factors influencing binding affinity.
• EMSA provides valuable insights into enzyme kinetics and drug interactions.