Protein–DNA Interactions under High-Pressure Conditions, Studied by Capillary Narrow-Tube Electrophoresis

The method of electrophoretic mobility shift assay under high-pressure conditions was improved using a high-pressure electrophoresis apparatus with capillary narrow-tube gel. It was found that the protein–DNA complex in the gel was stained as a high-resolution spot with ethidium bromide. Using this method, it was found that the behavior under high-pressure conditions of the protein–DNA complex composed of NtrC protein and its target promoter DNA is important for the pressure-regulated transcription process, and it was confirmed that the complex was dissociated above a pressure of 70 MPa.