The EMSA (electrophoretic mobility shift assay) is used to study protein:DNA complexes and interactions. Protein:DNA complexes migrate more slowly than unbound linear DNA on a non-denaturing gel, causing a “shift.”
Also called “gel shift” or “gel retardation” assays, EMSA can be used to analyze sequence-specific recognition of nucleic acids by proteins.
Traditional, radioactive EMSA protocols can be easily adapted to near-infrared fluorescence EMSA detection by using IRDye end-labeled oligonucleotides and imaging with the Odyssey® CLx or Odyssey Classic Infrared Imaging System, providing a safe and sensitive alternative.
For more information on the EMSA workflow and a sample protocol for infrared fluorescent mobility shift assays, visit our website.